Xem 1-20 trên 163 kết quả Natural forests
  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: A survey of forest pollution with heavy metals in the Natural Forest Region (NFR) Moravskoslezské Beskydy with particular attention to Jablunkov Pass...

    pdf9p toshiba4 13-09-2011 28 3   Download

  • Forests play an important role in reducing erosion. In Vietnam, destroying natural forests in mountainous areas has caused serious environmental problems for sustainable development. Required forest areas for protection of soils from erosion in Vietnam are defined in this study. An algorithm of defining required forest area for soil erosion prevention is based on a comparison of soil loss prediction and its threshold of 10 ton ha-1yr-1 (soil loss tolerance) within the GIS environment. Soil loss is predicted from rainfall erosivity index, slope, porosity and...

    pdf14p dem_thanh 22-12-2012 23 3   Download

  • Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Natural forest regeneration in spruce monocultures in the Ukrainian Beskids – prognosis by FORKOME model...

    pdf8p toshiba3 09-09-2011 16 2   Download

  • Tham khảo luận văn - đề án 'báo cáo lâm nghiệp: " dynamics of tree species composition and characteristics of available space utilization in the natural forest of the national nature reserve hrončokovský grúň"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf12p toshiba4 13-09-2011 20 2   Download

  • Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: C and 15 N isotopic fractionation in trees, soils and fungi in a natural forest stand and a Norway spruce plantation...

    pdf11p toshiba5 15-09-2011 24 2   Download

  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Fine root distribution, seasonal pattern and production in four plantations compared with a natural forest in Subtropical China...

    pdf11p toshiba4 20-09-2011 22 2   Download

  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Forest transport roads according to natural forest regions in the Czech Republic...

    pdf11p toshiba4 13-09-2011 19 1   Download

  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Litterfall, nutrient return, and leaf-litter decomposition in four plantations compared with a natural forest in subtropical China...

    pdf12p toshiba4 20-09-2011 18 1   Download

  • Vietnam is mostly located in the tropical region; Hilly and mountainous regions account for Hilly and mountainous regions account for ¾ of of VietnamVietnam’’s total natural land;s total natural land; Vietnam has coastal lines more than 3,000 km Vietnam has coastal lines more than 3,000 km long;long;High diversity of forests: tropical rain forest in High diversity of forests: tropical rain forest in most region, submost region, sub-tropical forest in the north and tropical forest in the north and at high altitudes, mangrove forest along at high altitudes, mangrove forest along coastlin...

    pdf31p xuanhien 11-06-2009 183 38   Download

  • The planet is a marvelous place with its blue skies, wild storms, deep lakes, and rich and diverse ecosystems. The tides ebb and flow, baby animals are born in the spring, and tropical rain forests harbor an astonishing array of life. The Earth sustains living things and provides humans with the resources they need to maintain a bountiful way of life. These resources include water, soil, and nutrients to grow food, and the mineral and energy resources to build and fuel modern society, among many other things....

    pdf225p sofia11 17-05-2012 70 28   Download

  • Focusing on the rich biodiversity of Costa Rica, the contributors demonstrate the use of geographic information systems (GIS) to enhance conservation efforts. They give an overview of the spatial nature of conservation and management and the current status of digital mapping in Costa Rica; a review of the basic principles behind digital mapping technologies; a series of case studies using these technologies at a variety of scales and for a range of conservation and management activities; and the results of the Costa Rican gap analysis project....

    pdf269p ktct_1669 08-05-2012 78 18   Download

  • Creating institutions to meet the challenge of sustainability is arguably the most important task confronting society; it is also dauntingly complex. Ecological, economic, and social elements all play a role, but despite ongoing efforts, researchers have yet to succeed in integrating the various disciplines in a way that gives adequate representation to the insights of each.Panarchy, a term devised to describe evolving hierarchical systems with multiple interrelated elements, offers an important new framework for understanding and resolving this dilemma.

    pdf650p greengrass304 14-09-2012 27 14   Download

  • The last quarter-century has seen increasing awareness of the interactions between human societies and the natural environment in which they thrive and upon which they depend. This awareness has been heightened by concerns about resource scarcity, environmental degradation, and global environmental issues. The combination of increased awareness of the environment and recognition of the primitive state of much of the nation’s environmental data has led to a widespread desire to supplement U.S. national economic accounts to include natural resources and environmental assets.

    pdf263p haiduong_1 03-04-2013 41 13   Download

  • The rain forest takes an immense breath and then exhales, once every four or five years, as a major global weather pattern plays out, usually heralded by El Nin˜o–Southern Oscillation. While this powerful natural cycle has occurred for many millennia, it is during the past decade that both the climate of Earth and the people living on it have had an increasing influence on the weather pattern itself, with many biological consequences. In Southeast Asia, as also in most of the Neotropics, El Nin˜o accompanies one of the most exuberant outpourings of nature’s diversity.

    pdf336p phoebe75 01-02-2013 24 10   Download

  • Hau Loc is a coastal district, located in the northeast of Thanh Hoa Province. its total natural land is 14,367.19 ha, 1.170 hectares of alluvial sites is suitable for planting forest and raise sea food. the The County has authorized 27 units (26 communes and townships 1). the total population of the district The year 2009 is 163.971 people, with density of 11.4 people per km2. The County has five coastal communes (Rhodes, Minh Loc, Ngu Loc, Hai Hung Loc and Loc) locate in East to the natural area is 3442.25 ha (accounting for 23.

    pdf0p xau_la 09-02-2012 39 9   Download

  • S. Robert Aiken was educated in the UK, Canada, and the United States. He is a cultural and historical geographer with a long-standing interest in tropical deforestation and environmental change in Southeast Asia, focusing mainly on Malaysia and Indonesia. He is presently working on indigenous land rights issues in Malaysia. Dr Aiken is coauthor (with C. H. Leigh) of Vanishing Rain Forests: The Ecological Transition in Malaysia (Oxford: Oxford University Press, 1992/1995) and author of Imperial Belvederes: The Hill Stations of Malaya (Kuala Lumpur: Oxford University Press, 1994).

    pdf305p huetay_1 28-02-2013 26 9   Download

  • William Bentley is the principal of Salmon Brook Associates in North Granby CT. He recently retired as Professor of Forest Policy and Management at the SUNY College of Environmental Science and Forestry, Syracuse NY, where he was Chair, Faculty of Forest and Natural Resources Management. He taught forest and natural resource economics at Michigan, Yale and other universities, managed Forestry Research for the Crown Zellerbach Corporation in the 1970s, worked for the Ford Foundation in New Delhi, India, and later was a senior program officer with Winrock International.

    pdf368p huetay_1 28-02-2013 23 7   Download

  • Ebook What can live in a forest? find out why the forest is a perfect habitat for animals like porcupines, bears, and deer, rabbit, bird, ants, squirrels, mice, frogs, bats, monkeys,... It is great book for children who like discover natural.

    pdf28p thieulam5782 04-10-2015 12 7   Download

  • This book, now in its third edition, began almost 25 years ago when Weed Ecology: Implications for Vegetation Management was published in 1984. That text concentrated on the need for farmers, foresters, rangeland managers, and the researchers who advised them to understand better the biology of weeds and the role people play in creating and maintaining weeds in agriculture and other production systems. We were assisted in that first effort by the writings of many early scientists, such as J. L. Harper, H. G. Baker, and E. J.

    pdf475p camchuong_1 11-12-2012 34 6   Download

  • Forest ecosystems cover large parts of the terrestrial land surface and are major components of the terrestrial carbon (C) cycle. Most important, forest ecosystems accumulate organic compounds with long C residence times in vegetation, detritus and, in particular, the soil by the process of C sequestration. Trees, the major components of forests, absorb large amounts of atmospheric carbon dioxide (CO2) by photosynthesis, and forests return an almost equal amount to the atmosphere by auto- and heterotrophic respiration.

    pdf298p thienbinh1311 13-12-2012 14 6   Download

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