Summary of Biology doctoral thesis: Research of landscape ecology in son la province to serve socio economic planning and development

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Classify landscape ecology system and establish maps of landscape ecology in Son La province; clarify the changes of landscape ecology in Son La over time (from 2005 to 2015); identify the scientific foundations based on studing landscape ecology to orientate rational territory use in agriculture, forestry and conservation

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Nội dung Text: Summary of Biology doctoral thesis: Research of landscape ecology in son la province to serve socio economic planning and development

MINISTRY OF EDUCATION VIETNAM ACADEMY OF SCIENCE AND TRAINING AND TECHNOLOGY GRADUATE UNIVERSITY OF SCIENCE ----------------------------- DOAN THI TRUONG NHUNG RESEARCH OF LANDSCAPE ECOLOGY IN SON LA PROVINCE TO SERVE SOCIO-ECONOMIC PLANNING AND DEVELOPMENT Major: Ecology Code: 9 42 01 20 SUMMARY OF BIOLOGY DOCTORAL THESIS Hà Nội - 2018
This thesis was finished at: Graduate University of Science and Technology – Vietnam Academy of Science and Technology Supervisor 1: Asc. Prof. DSc. Tran Dinh Ly Supervisor 2: Dr. Ha Quy Quynh Reviewer 1: ………………………………………………………………. Reviewer 2: ………………………………………………………………. Reviewer 3: ……………………………………………………………….. The theisis will be defended in Committee in front of the thesis assement committee at Graduate University of Science and Technology – Vietnam Academy of Science and Technology at ….hour….. on …………date …..….month…….year 2018 The thesis shall be found at: - The Library of Vietnam Academy of Science and Technology - The Vietnam National Library
1 INTRODUCTION 1. The significance of study Son La province locates in the North West of Vietnam, which is essential geological position in socio-economic development strategy and protection of national and regional security and defense. Moreover, Son La is ensuring national and regional security and defense. Simultaneously, having the watersheds of Da and Ma River, this province is the crucial protection area for the Northern Delta and has the two largest hydropower projects in Vietnam. With the terrain predominated by low mountain, highlands and valleys, abundance of land and climate resources, and a special local knowledge system, Son La has great prospects for developing agriculture, forestry, trade and tourism, bringing socio-economic and environmental efficiencies. However, low effectiveness of natural resource protection in Son La has positive effects on other regions in the downstream of Da River and Ma River. In recent 10 years, land use system and in structure of cultivated plants have been change rapidly. In the province, land degradation has been more seriously, water resource has been degraded; environment pollution caused by deforestation and agricultural chemical and natural hazards have been more frequently and caused more and more risks [84]. Thus, in long term strategy of socio-economic development need scientifically consider rapid and sustainable development following functional regions. Researching landscape ecology (LE) is a synthetic and interdisciplinary approach from research of species structure, environment characteristics, ecological and regional conditions, and distributional regions. Researching ecological landscape aims to clearly understanding of natural resources and natural conditions; the interaction relation among natural components; features and functions of each territorial unit, etc. which are foundations of new proposals of properly and sustainable natural resource extractions and uses.Thus, nowadays, it is necessary to research ecological landscapes in Son La province aiming to orientation of ecological function exploitation, reformation and rehabilitation of provincial territory. In this fact, the study of "Research of landscape ecology in Son La provinces to serverve socioeconomic planning and development" contributes to sustainable socio- economic development in Son La province. 2. Thesis Ojectives The thesis aims to: - Classify landscape ecology system and establish maps of landscape ecology in Son La province - Clarify the changes of landscape ecology in Son La over time (from 2005 to 2015) - Identify the scientific foundations based on studing landscape ecology to orientate rational territory use in agriculture, forestry and conservation
2 3. Main contents of the thesis - Scientific bases of LE and classification of LE - Characteristics of components of the LE in Son La province such as natural features, socio-economic characteristics, humans and human activities - System of landscape ecology in Son La province - Assessment of the changes of the landscape ecology system in Son La province. - To propose solutions for rational and sustainable use of natural resources in Son La province. CHAPTER 1. LITERATURE REVIEW AND SCIENTIFC BASES OF STUDY ISSUES 1.1. Scientific fields related to landscape ecology 1.1.1. Ecology Ecology originated from Greek, “Oikos” means "house" or "living relation"; “Logos” means "study of". Thus, ecology means the scientific study of the relations of organisms and their habitats. There are many different definitions of ecology, but, generally, they are united that: ecology is a biology science that studies the interrelations between organisms and the environment. 1.1.2. Ecosystem  Ecosystem concept: Vu Trung Tang (2003) [63] defined: “ecosystem is a combination of biomes with their physical environment where they are existed, in which, organism interact each other and with environment to create a material cycle and energy metabolism"  Ecosystem components: Ecosystem includes two basic components: biomes và physical environment.  Ecosystem structure: Including biomes, their physical environment, interrelations among organisms, interactions between organisms and their environment.  Ecosystem functions: The basic function of the ecosystem is the implementation of the material cycle, energy and information exchange to recombine biomes adapting with condition of biophysical environments, creating a dynamic balance in development process.  Ecosystem Nature: Ecosystem has some features, three most significant features of which have been mentioned in this part, including: - Ecosystem is a constantly moving and changing system, the static state is only relative and temporary. - Ecosystem is an adjustable dynamic balance system - The higher the diversity, the greater the sustainability 1.1.3. Landscape study  Concept of landscape
3 In this thesis, LE is defined as a form concept. "landscape is a complete part of the earth's surface with geomorphology, structure, and determined complexion in the development process and causal relations of impact factor integration" [97].  Elements of landscape forming In Son La province, the thesis analysed the culture features, the role of landscape forming factors and the relationship between them, and at the same time, grouped these elements. Group of abiotic elements includes: geological background, terrain and processes of geomorphology, climate and hydrology. Group of biotic elements includes soil, biological system, duration and human activities.  System of landscape classification Pham Hoang Hai and his colleagues (1997) constructed a landscape classification system applied to the Vietnam territory at the map of a 1/1,000,000 scale with 7 levels: Landscape systems →Landscape subsystems → Landscape class → Landscape subclass → Landscape type → Landscape sub-type → Landscapes kind [27].  Structure and dynamic of landscapes - Landscape structures include horizontal, vertical and temporal structure - Landscape dynamic and changes  Landscape functions Landscape functions have different conceptions 1.1.4. Biogeocenology Biogeocenos are defined as "synthesizing natural phenomena on a certain surface in a accordant manner with the matter exchange and transformation flow among natural conditions (mother rocks, floras, faunas, micro-organisms, soils and hydro-climatic conditions), which have particular characteristics for the interactions of the constituent elements and have the specific types of material and energy exchanges between them and other natural phenomena and is a dialectical unity having initial contradictory in the constantly movement "(Sukachev, 1947) [122]. In a simple understanding, biogeocenos includes biocoenosis and habitat. The nature of the interrelationship between the components of biogeocenos is the processes of matter and energy accumulation and transformation (Sukachev called the process of biogeocenos) that decide the arising, growth, development and ecological succession of forest ecosystems. 1.2. Research review of Landscape Ecology 1.2.1. Concept of landscape ecology  Definitions of landscape ecology focusing on ecological specialties of landscape The most common point of definition focuses on two important aspects of interaction between organism and its environment that enables to differentiate between landscape ecology research and ecology research.  Definitions focus on humanity features of landscapes
4 In this way, the definitions focus on the theoretical points that this is general and interdisciplinary sciences that study the relationship between human and the landscape.  Landscape ecology of landscape scientists in Soviet and Vietnam According to Soviet landscapeologists, LE is a new discipline of landscape study, in which, humans are included as a part of the landscape in the form of economic activities and surrounding elements forming the landscape [72]. In Vietnam, all the most important definitions of the LE are given by geographers. LE is a discipline of applied landscape study, with particular emphasis on ecological features of geology. Subjects of LE study are specific units with their own principles, methods, and special regulation to classify them in the spatial dimensions [27].  Integrated definition of landscape ecology LE has two basic aspects: teritorial landscape and ecosystem of lanscape. These two aspects are independent but link closely together in a united territory. The LE theory issues are also the unification of landscape theory and the ecosystem theory. Thus, the LE is a science studying and explaining the interactions of the system of biotic and abiotic elements in the definite space of the landscape. Studying landscape considers two directions including landscape compositions and entire of landscape, while studying LE focuses on the ecological characteristics of landscape components. Each landscape component is specifically considered in terms of environment of the organism, and interacting with the organism according to ecological laws [72] 1.2.2. Structure and functions of landscape ecology The structure of LE consists of the landscape structure (the natural geographic components of the landscape) and the ecosystem structure (organic and inorganic materials, producers, consummers and decomposers) which are intergrated in a unity. The function of LE is multifunctional, including the natural functions of the landscape and the ecological functions of the ecosystem. The change of any structural element of the landscape will cause the change of other components and the change of landscape and all landscape functions. 1.2.3. Differentiation between “Landscape ecology” and “Ecological Landscape” “Landscape ecology”: is the intermediate science between ecology and landscape where ecological content is more focused than ecological issues in the landscape, the centre of reflection is the ecosystems within the landscape boundary [87]. “Ecological landscape”: In the foreign references, we only found the term of Landscape Ecology (or Landschafts Oekologie in German) while the term of Ecological Landscape (Oekologische Landschaft) has not been found. The explanation for the two concepts presented by Nguyen The Thon (1993) [74] differentiated unclearly these two concepts. Therefore, this research recommends using the term of Landscape Ecology only.
5 1.2.4. Literature review of Landscape Ecology  On the world Ecologycal study of landscape has begun in the second half of the 1960s at the Institute of Biology Landscape at the Academy Sciences of Czechoslovakia (1967). The Fifth Conference (1974) initiated the establishment of the International Association of Landscape Ecology (IALE), the first of meeting was held in Denmark in 1984. It i scan be seen that ecologycal study of landscape means determination of ecological characteristics and norms of a landscape in order to protect and improve the environment [72].  In Vietnam The study contents of the landscape ecology have become clearly since Vietnam joined the International Association of Landscape Ecology in 1992. Researches in this period is oriented and had research scale in accordance with demands for economic development and environmental protection at the territorial level. Most of the landscape ecology studies in Vietnam have been conducted following the landscape structure analysis, landscape assessment, and determination of ecological economic models. 1.3. Studies related to thesis topic in Son La province Many previous studies related to the thesis topics, in different fields, are carried out in different periods. The authors investigated on the natural, socio-economic conditions of Son La province and grouped of researches implemented in the territory of Son La province. 1.4. Theoretical bases Based on scientific publications of ecosystem, landscapes, this thesis create foundation theory for studing LE in Son La. The scientific contents and theory for thesis approaching the research isues include: - The term of „landscape ecology“ or „ecology study of landscape“ has the same definition of natural objects, thus, the thesis uses the term of „landscape ecology“. - The viewpoint:"LE is the science of studying the interactions between organisms and the environment, organisms and organisms in a certain area limited by the landscape" (Schubert, 1986, p. 447) [121] was used in this study. LE units are ecosystems - LE has clear hierarchy and classification as follows: LE system – LE sub- system - LE class – LE sub-class - LE type – LE sub-type – LE kind. The objects of LE study is the ecosystem in the landscape. Therefore, the specific object in this thesis is sub-system of monsoon tropical monsoons LE with mild winters and a dry season in Son La. Because the separate classification for LE in Son La province has been inexistent, the thesis used the landscape classification by Pham Hoang Hai et al. (1997) [27] as a foundation for ranking the levels of the LE system in Son La province. From the theoretical and scientific bases, the criteria for applying LE classification, the thesis gave the classification criteria for the research area following
6 the hierarchy of system  sub-system  class  sub-class  sub-class  type  sub-type  kind. CHAPTER 2. RESEARCH CONTENTS, VIEWPOINTS AND METHODS 2.1. Research Contents - Scientific bases of landscape ecology and landscape ecology classification - Characteristics of components of landscape ecology in Son La: Natural - social - economic conditions - human beings and human activities - System of landscape ecology in Son La - Change assessment of landscape ecology system in Son La - Suggestion of solutions for sustainable and proper use of natural resources in Son La 2.2. Theoretical viewpoints of the research 2.2.1. Systematic viewpoint The basis of the systemic viewpoints is the conception of the unity and completeness of internal relationships and the distribution of the external linkage of the system. 2.2.2. Synthetic viewpoint Synthesis is considered at two different views: (1) Synthesis is the process of comprehensive research on the natural and socio-economic conditions, the relationships between organisms in the ecosystem in the territory of the landscape. (2) Synthesis is a systematic and regulative combination based on comphrehensive and integrated analysis of the elements and factors of natural terrestrial aggregates, simultaneously, identifies biological laws, relationships between organisms in the geographic locations 2.2.3. Territorial viewpoint For the evaluation process to be effective, research should establish theoretical and practical issues related to organization and planning based on the approach of the territorial point of view. This ensures that the research territory is assessed not only in relation to neighbouring territories, but also for the specific characteristics of Son La province. 2.2.4. Historical perspective Every territorial unit or geographic entity has to go through the processes of formation, development and evolution over time. Thus, the process of assessing and perceiving the territory from a historical perspective is a full access to all aspects of territory in the past and forecast of their changes in the future. 2.2.5. Interdisciplinary and sustainable development viewpoints Sustainable Development (SD), a new and comprehensive aspect, has great concerned when the economic development affects on the human environment and natural resources. Research and assessment of landscape ecology from the SD point of view is understood to be an evaluation for each unit level based on an integrated assessment of the constituent elements, structure and functions of the landscape
7 ecology. Using landscape ecology units ensures economic, environmental and social factors in practice application. 2.3. Research methods 2.3.1. Fieldworks The fieldworks were conducted based on a detailed survey of the formation factors and the landscape slice. Main survey routes and timeframes include: - Route 1: Son La - Bac Yen - Phu Yen: April 15th - 14th, 2014. - Route 2: Son La - Thuan Chau - Muong La - Quynh Nhai: May 20 to 27, 2015. - Route 3: Son La - Mai Son - Yen Chau - Moc Chau: from March 1 to March 8, 2016. 2.3.2. Data and document analysis and synthesis Materials, data related to research topic, research areas are collected, selected, processed and systematized. 2.3.3. Mapping and GIS Map is considered as the second language of geography, because they are the most visible expressing spatial features of the research objects. Digital maps have enough spatial and attribute information for the features of interest, helping the composite mapping process to be performed accurately and objectively. Mapping and geographic information systems (GIS) are used in a various context throughout the research process. 2.3.4. Professional expert interview The researcher has consulted experts and scientists from the Institute of Ecology and Biological Resources, Institute of Geography, Vietnam Academy of Science and Technology, Department of Agriculture and Rural Development, Department of Natural Resources and Environment, Department of Science and Technology of Son La province; Son La Forest Protection Department, Son La Nature Reserve Management Board, University of Natural Sciences - VNU, Tay Bac University ... 2.3.5. Method group of landscape ecology research and assessment The methodology group includes: - Method of Conjugate component map analysis - Method of the dominant factor analysis - Method of LE mapping - Method of landscape zoning 2.4. Steps of research The research was done by this following main steps: Step 1. Difined the ojectives, duties and scales and contents of research Step 2. Collecting and reviewing typical issues related to thesis topic, at the same time, doing the field trips and identifying the differented characteristics of the constituent factors and their role in LE of Son La province. Step 3. Research the landscape and LE classification systems, then, construct the 1:100.000 scale map of LE in Son La.
8 Step 4. Calculate the area of each LE kind over time and the changes of each LE kind. Step 5. Give orientation of proper exploitation and use of territory toward socio-economic developmemt. CHAPTER 3. RESULTS AND DISCUSSION 3.1. Natural conditions, human ecology elements - formation factors of landscape ecology 3.1.1. Natural conditions  Geographical location Son La is a mountainous province in northwestern Vietnam, far 280 km from south-east of Hanoi, with a total natural land area of 14,125 km², located in two large basins of Da River and Ma River. Located deeply in the continent, Son La is situated within the latitude of 20 °39’ N to 22°02’ N and longitude of 103°11’ E to 105°02’ east longitude. It borders with Yen Bai, Lao Cai provinces to the north, with Phu Tho, Hoa Binh province to the east, with Lai Chau, Dien Bien provinces to the West and Thanh Hoa province, Laos to the south  Geology - Typography Geology: Son La belongs to the geosyncline zone of Da River, located between the two tectonic complexes of Hoang Lien Son mountain range and Ma River with deep-marine sediments of limestone, metamorphic schist and basis and acidic magma intrusive blocks. Typography: The arrangement of mountain ranges, terrain types and tropical monsoon regimes divide Son La into different natural areas such as: upland, midland and lowland with specific characteristics of climate. The largest limestone range in the north goes through Son La in the northwest - southeast direction, intercalated by the sediment of clay forming the system of Son La - Moc Chau plateau. This is a terrain type with special features of the province.  Climate and Hydrology Climate: Son La has a humid tropical monsoon climate, with mild winters and a dry season. Climate has a strong impact on the physical, chemical and biological processes of soil and rock. Hydrology: Territorial topography features create a dense network of rivers and streams in Son La that flow into the Da and Ma rivers. Therefore, these two rivers are the main hydrological systems of Son La and the natural boundary of the huge waterway of the Xu Xen Chao Chai Range.  Soil Results of soil survey, editing, land mapping at the rate of 1:100,000 (according to the soil classification system 1976-1984) in 2004 of the National Institute of Agricultural Planning and Projection shown that land resources in Son La province contain 7 groups with 24 types (mapping unit) with 1,329,644.1 ha,
9 accounting for 94.61% of the total natural area of the province (Table 3.1), (Figure 3.4).  Floras Because of characteristics of geographical location, topography, climate and soil, Son La province has very different ecosystems, the floras of conservation areas, special- use forests, production forests and cultivated areas are also different from those in the North East, the Red River Delta and elsewhere. Over time, the area of natural forests, plantation forests have been evolved according to the demands of each period for war serves, economic construction and people's life. In general, the natural forests in Son La province have been degraded considerably, the areas of bare land and hills have been increased. Despite the investment of the province to restore the forest, create a material source to meet the essential needs, both positive and negative human impacts have changed the appearance of forests in Son La. Natural forests have retreated to areas with difficult terrain, few inhabitants, or only protected in nature reserves, instead of regenerating forests, plantation forests, industrial plants with industrial trees, fruit trees and up-land fields. Reforestation, zoning for protection and rehabilitation have great efforts, however, a large area of bare hills widely still distributes in all topographic types and forms. The vegetation cover in Son La province is classified into four classes according to the classification framework of UNESCO 1973 (Figure 3.5). Class I: Closed forests are determined by over 60% of the wood tree covers and from 5m height of the trees Class II: thin forests are defined by the canopy cover (k) from 0.3 to 0.6. Some authors argued that this type of forests exists in some small areas in Moc Chau, Thuan Chau and Yen Chau districts (Son La). Through the survey, this forest types in Son La was almost depleted or cut down and to be shrub or grass cover Class III: Shrubs include woody vegetation cover with a height of 0.5 - 5m, possibly with scattered wood trees with canopy cover under 0.3. This class mostly have secondary origin and was regenerated after clear cutting or slash and burn. Only bushes on high mountains are primeval nature. Class IV: Grassland Most of the grasslands in Son La have secondary origin and are formed after clear cutting or slash and burn to create large gaps for grass growing 3.1.2. Elements of human ecology  Ethnics and Population: There are 12 ethnic groups in Son Lan, in which, the Thai have the most population, following by the Kinh, the H'mong, the Muong, the Dao, the Khơ Mú and others (Kháng, La Ha, Lào, Hoa, Xinh Mun...).  Poverty reduction and employment: In recent years, the National Program on Hunger Eradication and Poverty Reduction, socio-economic development projects such as Program 135; 134; sedentary
10 farming program; rural clean water and sanitation, etc. along with policies such as policy 120; subsidy policy, … have been done in Son La  Economic structure: The economic growth rate in 2014 was higher than that of 2013 (10.26% in 2013 and 11.28% in 2014). The economic structure continued to change positively: the service sector increased from 40.92% in 2013 to 42.3% in 2014, occupied high proportion and are the most contribution of the economy; the industry-construction sector grew from 24.92% in 2013 to 26.65% in 2014; the agriculture, forestry and fishery sector decreased from 34.16% in 2013 to 31.05% in 2014.  Human impacts on the natural environment Water Environment: Surface water and groundwater in Son La province are polluted mainly by agricultural activities, urban and industrial wastewater, loss of upstream forests, migration and resettlement. Air environment: Human activities that polluted the air environment include construction, transportation, industrial production, forest fire and mining. Soil environment: The soil environment in Son La province is polluted and degraded due to migration, resettlement, agricultural production, industrial production, natural disasters and environmental incidents. 3.2. Classification system of landscape ecology in Son La province Based on analyzing the components of the landscape ecology system in Son La province, we set up the system of classifying the landscape ecologies in Son La province as follows: Son La is in the monsoon tropical zone, has a cold winter and a dry season. Thus landscape ecology is formed 4 classes, 5 sub-classes, 13 types, 33 sub- types and 63 kinds (table 3.2) Table 3.2. Statistics of landscape ecology units in Son La province System/ Sub- Area sub- Class Type Sub-type class (ha) systems LE High 1. Evergreen 1. Forests on Humic 2,172.56 system mountai temperate and sub- Chromic Luvisol, of n LE tropical forests on including LE kind of moonso sub- high mountains, total 1a, 1b on class of annual tropical, (SLI-1) temperature under LE sub- Mounta 5.500ºC, average type of in LE annual temperature moonso class
11 System/ Sub- Area sub- Class Type Sub-type class (ha) systems dry 2. Temperate and 2. Evergreen shrub on 35.21 season sub-tropical Humic Alisols evergreen shrub on including kind of 2g high mountain, annual temperature total: under 5.500ºC, annual average temperature: under 10ºC, cold season:8 months (SLI-1-k2) LE sub- 3. Evergreen 3. Closed evergreen 745.90 calss of temperate on closed forests on everage everage mountain Humic Alisols, mountai forest, total of including LE kind of n annual temperature 3c (SLI-2) under 5500°C, 4. Forests on Humic 21,925.52 annual average Ferrasols including temperature of 10 - LE kind of 4c 15°C, moderate rainfall, cold season in over 8 months, dry season in 5 - 6 months, in which 0÷3-month drought (SLI-2-k1) 4. Sub-tropical 5. Shrubs and grasses 1,189.71 bushes and grasses. on Humic Ferralsols, Total of annual incl. kind of 5g. temperature under 6. Shrubs and grasses 852.37
12 System/ Sub- Area sub- Class Type Sub-type class (ha) systems mountai temperature of 8. Closed evergreen 96,940.17 ns 5.500° - 7.300°C, sub-tropical forests (SLI-3) the average on Orthic Ferralsols, temperature is 15 - incl. kind of 8c 20°C, heavy rain, 9. Closed evergreen 63,845.74 4÷7-month seasons, sub-tropical forests 3÷4 month dry on Ferralic Acrisols, seasons, 0÷1-month incl. kinds of 9c, 9e, drought (SLI-3-k1) 9f, 9k 10. Closed evergreen 18,553.47 rainforests on Ferralsols, incl. kind of 10c 11. Mix bamboo 5,341.79 forests on Ferralsols, incl. kind of 11e 6. Closed deciduous 12. Closed deciduous 4,376.52 and semi-deciduous and semi-deciduous tropical rainforest tropical rainforests on (SLI-3-k2) Orthic Ferrasols, incl. kind of 12d 7. Tropical bushes 13. Tropical bushes 43,383.45 and grasses (SLI-3- and grasses on Orthic k3) Ferralsols incl. kinds of 13g, 13i, 13k 14. Shrubs and 103,482.64 bushes on Ferralic Acrisols, incl. kinds of 14g, 14i, 14k 15. Shrubs and 78,271.41 bushes on other Ferrasols, incl. kinds of 15i, 15k 16. Shrubs and 3,620.75 bushes onn Dystric Gleysols, incl. kind of 16i, 16k 17. Bushes on 32,556.56 Chromic Ferralsols, incl. kinds of 17g, 17i, 17k LE LE 8. Closed evergreen 18. Closed evergreen 37,314.74 class of subclas tropical rainforests, tropical rainforests Pleatau s of Son on the altitude of Chromic Ferralsols,
13 System/ Sub- Area sub- Class Type Sub-type class (ha) systems (SLII) La 500 - 900m incl. kinds of 18c, pleatau (1000m). Total of 18e, 18f annual temperature 19. Closed evergreen 32,720.81 over 7,300°C. tropical rainforests on Annual rainfalls Ferrasols, incl. kinds from 500 - 2500 of 19c, 19f mm. 20 ° C, 3÷4-month dry season, 0÷1-month drought. Major botanical components are tropical taxa (SLII- k1) 20. Closed deciduous 917.49 and semi-deciduous tropical rainforests on Chromic Ferralsols, incl. kind of 20f 21. Closed deciduous 57,103.79 and semi-deciduous tropical rainforests on Acric Ferralsols, incl. kind of 21i 10. Tropical Shrubs 22. Shrubs and 125,837.86 and grasses grasses on Chromic (SLII-k3) Ferralsols, incl. kinds of 22g, 22i, 22k LE 11. Closed 23. Closed 5,539.85 class of evergreeen tropical evergreeen tropical hills rainforests rainforests on Orthic and Total of annual Ferralsols, incl. kind lowland temperature over of 23e s at the 7300°C, average 24. Closed 133,088.76 altitude annual temperature evergreeen tropical under >20°C, annual rainforests on 500m rainfalls are 1500- Chromic Ferralsols, (SLIII) 2500 mm,
14 System/ Sub- Area sub- Class Type Sub-type class (ha) systems components are other Ferrasols, incl. tropical taxa (SLIII-kinds of 25c, 25e K1) 26. Closed deciduous 1,943.37 and semi-deciduous tropical rainforests Ferralic Acrisols, incl. kind of 26e 12. Closed 27. Closed deciduous 25,541.54 evergreen tropical and semi-deciduous rainforests tropical rainforests on Total of annual Ferralic Acrisols, temperature incl. kinds of 27c, >7300°C; evarage 27e annual temperature 28. Closed deciduous 263.07 > 20°C, annual and semi-deciduous rainfalls are 1500 - tropical rainforests on 2500 mm,
15 System/ Sub- Area sub- Class Type Sub-type class (ha) systems lakes lakes (SLIV) Total 1,412,500.00 3.3. Change of Landscape ecology in Son La province Based on the results of the formulation factor study of LE (terrain, soil, climate) and hydrography, especially, the results of the vegetation cover survey in 2015 and documents collected from 2005, the thesis has established the map of LE in 2 periods of the year 2005 and 2015, and then assessed the variation of all types of LE in Son La province. 3.3.1. Map of landscape ecology in 2005 Based on LE analysis, synthesis and mapping in Son La province in 2005 (Figure 3.16), then determined the area and position of each LE type, the area of LE kinds in Son La province in 2005 is illustrated in Table 3.5 and figure 3.17. Figure 3.17. The area of LE kinds in Son La province in 2005 At the year 2005, the major LE kinds in Son La were 7c, 24c with an area of approximately 225,515.33 ha and 154,397.95 ha, respectively, followed by kind of 31i with an area of 149,101.44 ha and kinds of 22i with an area of 126,196.90 ha. Some LE kinds have smaller area such as 8c, 18c and 9c with a total of area is about 240,029.69 ha. The smallest kinds are scrubs on humic Alisols (2g) with 35.24 ha; residential land on low mountain (13k) with 59.79 ha; broadleaved deciduous and semi-deciduous forests on Ferralsols (27d) with 51.22 ha; residential land in class of hills and lowland (32k) with 63.16 ha; mixed broadleaved-coniferous forests on Humic Chromic Luvisol (1b) with an area of 269.25 ha.
16 3.3.2. Map of landscape ecology in 2015 By analyzing, synthesizing, mapping the STCQ of Son La province in 2015 (Figure 3.18), then determine the area and position of each type of STCQ. The area of STCQs in Son La province in 2015 is shown in Table 3.5 and figure 3.19. Diện tích Diện (ha) tích (ha) 200000 180000 160000 140000 120000 100000 80000 60000 40000 20000 0 1a 3c 6g 9c 9k 12d 13k 14k 15k 17g 18c 19c 21i 22k 24e 25c 27c 29g 30i 32g 33i Loại cảnh quan Các loại sinh thái cảnh quan Figure 3.19. The area of LE kinds in Son La province in 2015 In 2015, the major LE kinds are 7c with an area of 172,591.01 ha, 31i with an area of approximately 155,293.45 ha, 24c with an area of 128,613,93 ha and 22i with an area of 104,795.24 ha. Some smaller LE kinds are 8c, 9c and 14g with a total area of about 211,110.95 ha. The smallest area of LE kinds are grasses and bushes on humic Alisols (2g) with 35.21 ha; broadleaved deciduous and semi-deciduous forests on Chromic Ferralsols (28d) with an area of 263.07 ha; mixed broadleaved- coniferous forests on Humic Chromic Luvisols (1b) with an area of 268.98 ha. 3.3.3. Changes of landscape ecology in Son La over periods Based on data of area of LE kinds in 2005 and 2015, the changes of area of LE kinds between 2005-2015 are shown in Table 3.5 and figure 3.20. Table 3.5. Changes of ara of landscape ecology kinds between 2005 and 2015 Unit: ha Code of LE Area of LE kinds Area of LE kinds Changes No. kinds in 2005 in 2015 between 2005 - 2015 1 1a 1,905.50 1,903.58 -1.92 2 1b 269.25 268.98 -0.27 3 2g 35.24 35.21 -0.03 4 3c 746.66 745.90 -0.76 5 4c 22,330.56 21,925.52 -405.04
17 Code of LE Area of LE kinds Area of LE kinds Changes No. kinds in 2005 in 2015 between 2005 - 2015 6 5g 1,190.91 1,189.71 -1.20 7 6g 853.23 852.37 -0.86 8 7c 225,515.33 172,591.01 -52,924.32 9 8c 102,901.40 96,940.17 -5,961.23 10 9c 65,702.57 59,107.08 -6,595.49 11 9e 133.76 133.62 -0.14 12 9f 3,749.50 1,912.24 -1,837.26 13 9k - 2,692.80 2,692.80 14 10c 21,641.40 18,553.47 -3,087.93 15 11e 5,567.10 5,341.79 -225.31 16 12d 4,380.95 4.376,52 -4.43 17 13g 5,530.24 8,747.37 3,217.13 18 13i 22,196.71 33,437.08 11,240.37 19 13k 59.79 1,199.00 1,139.21 20 14g 33,609.97 55,063.70 21,453.73 21 14i 26,212.11 45,738.75 19,526.64 22 14k 912.05 2,680.19 1,768.14 23 15g 21,175.06 21,959.09 784.03 24 15i 59,685.44 50,666.54 -9,018.90 25 15k 6,163.54 5,645.78 -517.76 26 16i 2,649.09 2,646.42 -2.67 27 16k 372.54 974.33 601.79 28 17g 8,645.78 8,629.80 -15.98 29 17i 20,175.52 17,160.58 -3,014.94 30 17k 2,927.74 6,766.18 3,838.44 31 18c 71,425.72 33,455.82 -37,969.90 32 18e 2,470.05 547.39 -1,922.66 33 18f 1,972.82 3,311.53 1,338.71 34 19c 21,082.33 29,477.79 8,395.46 35 19f 2,121.67 3,243.02 1,121.35 36 20f 918.41 917.49 -0.92 37 21i 1,241.73 57,103.79 55,862.06 38 22g 17,012.97 16,593.36 -419.61 39 22i 126,196.90 104,795.24 -21,401.66 40 22k 4,827.12 4,449.23 -377.89 41 23e 5,407.59 5,539.85 132.26 42 24c 154,397.95 128,613.93 -25,784.02 43 24e 962.80 964.66 1.86 44 24f 1,835.76 2,945.67 1,109.91
18 Code of LE Area of LE kinds Area of LE kinds Changes No. kinds in 2005 in 2015 between 2005 - 2015 45 24k - 564.50 564.50 46 25c 10,249.44 9,232.27 -1,017.17 47 25e 3,800.54 3,465.55 -334.99 48 26e 2,202.95 1,943.37 -259.58 49 27c 31,299.49 23,925.28 -7,374.21 50 27d 51.22 0 -51.22 51 27e 1.752.85 1,616.26 -136.59 52 28d 212.11 263.07 50.96 53 29g 52,418.83 50,964.86 -1,453.97 54 29i 20,616.71 20,724.18 107.47 55 29k 3,131.90 15,999.26 12,867.36 56 30i 1,723.80 3,263.44 1,539.64 57 31i 149,101.44 155,293.45 6,192.01 58 31k 22,775.38 32,673.59 9,898.21 59 32g 17,452.49 22,320.89 4,868.40 60 32i 1,102.12 1,547.29 445.17 61 32k 63.16 276.75 213.59 62 33i 232.81 1,091.84 859.03 63 34l 15,200.00 25,490.64 10,290.64 Total of area 1,412,500.00 1,412,500.00 0 Diện tích (ha) 80000 60000 40000 20000 0 1a 3c 6g 9c 9k 12d 13k 14k 15k 17g 18c 19c 21i 22k 24e 25c 27c 28d 29k 31k 32k -20000 -40000 -60000 Loại cảnh quan Các loại sinh thái cảnh quan Figure 3.20: The area changes of LE kinds in Son La overtime