Plant communities

Xem 1-20 trên 149 kết quả Plant communities
  • Diversity of plant form and life history and their distribution onto different habitats suggest that plant functions should underlie this diversity, providing tools to successfully and differentially thrive in every habitat. The knowledge of these functions is then the key to understand community and ecosystem structure and functioning, something that attracted the interest and effort of many plant ecologists trying to establish patterns of adaptive specialization in plants.

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  • This book is about the conservation of genetic diversity of wild plants in situ in their natural surroundings, primarily in existing protected areas but also outside conventional protected areas. A lot of effort has been dedicated to conserving plant biodiversity, but most of this has focused on rare plant communities or individual species threatened with extinction.

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: The influence of Picea abies on herb vegetation in forest plant communities of the Veporské vrchy Mts...

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Plant community variability within potential natural vegetation units: a case study from the Bohemian Karst...

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  • Tham khảo luận văn - đề án 'báo cáo lâm nghiệp: " soil and plant communities development and ecological effectiveness of reclamation on a sand mine cast"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • The wide geographical distribution of the rice plant ( Oryza sativa L.) and its long history of cultivation in Asian countries have led to the development of a great diversity of varietal types. Similarly, workers in various rice-growing countries use different terms to designate identical morphological and physiological characters, agronomic traits, gene symbols, and cultural practices. Whereas varietal diversity in germ plasm is desired in rice breeding, variations in nomenclature hinder scientific communication among the workers.

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  • Evidence grows daily of the rapid changes in climate due to human activities and their impact on plants and animals. Plant function is inextricably linked to climate and atmospheric carbon dioxide concentration. On the shortest and smallest scales the climate affects the plant’s immediate environment and thus directly influences physiological processes. On longer and larger time and space scales climate influ- ences species distribution and community composition and determines what crops can be viably produced in managed agricultural, horticultural and forestry ecosys- tems.

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  • Bacteria that associate with plants are diverse in their ability to affect plant health, their genotypic and phenotypic characteristics, and their phylogeny. These bacteria are typically members of complex microbial communities, with only a few establishing pure clonal populations within a plant.

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  • Microbial biomass formation on root surfaces can be measured in plants growing in solution with or without an inert solid support. Carbon flow to the biomass can be measured by growing plants in solution or soil on a continuous source of 14C02 and the expected biomass formation predicted. The lack of correlation between measured and predicted biomass can be explained by oligotrophic growth of the micro-organisms.

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  • Forests play a major role in global carbon (C) cycle, and the carbon density (CD) could reflect its ecological function of C sequestration. Study on the CD of different forest types on a community scale is crucial to characterize in depth the capacity of forest C sequestration.

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  • This authoritative new work analyses European plant intellectual property rights. Whilst the focus of the work is on Europe, and in particular the European Patent Convention, the Council Regulation on Community Plant Variety Rights and the EU Directive on the Legal Protection of Biotechnological Inventions, these provisions are discussed within the context of international legislation, including the Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPs) and the Convention on Biological Diversity.

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  • many groups and individuals have been motivated to consider the potential for producing ethanol. Across the country, farmer cooperatives, rural development coalitions, bio-energy advocates and others have gathered to explore the process and prospects for developing ethanol production facilities. In many cases these efforts have resulted in the successful development of ethanol plants.

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  • THE FORM AND FUNCTION of multicellular organism would not be possible without efficient communication among cells, tissues, and organs. In higher plants, regulation and coordination of metabolism, growth, and morphogenesis often depend on chemical signals from one part of the plant to another. This idea originated in the nineteenth century with the German botanist Julius von Sachs (1832–1897). Sachs proposed that chemical messengers are responsible for the formation and growth of different plant organs.

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  • I’ve got a case of the mean reds, so I thought I’d pass some of them on— see the enclosed Xeroxes, concluding with a typically impudent communication from Riddley, he of the coal-black skin and three hundred huge white teeth.

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  • This is a book about the Cerrado Biome, a major Brazilian savanna-like ecosystem for which no such summary exists. Biologists outside Brazil know little about the cerrados, despite the fact that the biome covers approximately 22% of the country’s surface area, or 2 million km2. Even though much of the attention of conservationists has focused on rainforests such as the Amazon and Atlantic forests, the cerrados are currently one the most threatened biomes of South America due to the rapid expansion of agriculture.

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  • While this was an improvement over the complex and specialised information gathering of the past, it was still based on outsiders obtaining information, which was then taken away for analysis and use in the preparation of development interventions. Local opinions and ideas were gathered more effectively, but control and ownership remained outside of the communities being «developed».

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  • This system is financed through a mixture of public and private insurance and out-of-pocket payments by families, especially for mental, developmental, and oral health services that are not well covered by insurance.Many services are pro- vided within the traditional health care sector (doctors’ offices, hospitals, and clinics); however, some services such as mental health services take place outside the health care sector in schools and in child care and community centers, further fragmenting delivery pathways and complicating access.

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  • All living organisms require food for survival, growth, and reproduction. Most broadly, the term food can be taken to include any kind of nutrient needed by animals, plants, and simpler forms of life, on down to bacteria. This would include, for example, the inorganic substances that 5 plants draw from air and water. The processes that circulate these basic nutrients in the environment are called nutrient cycles, and the processes by which organisms make use of nutrients are collectively known as metabolism.

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  • In the published research work emerging from the universities and USDA laboratories there is, as noted, no conscious effort to learn how nature feeds the microorganisms who feed the plants (as documented by Krasilnikov, 1958; McLaren and Peterson, 1967; Jennings, 1963; Sanders et al, 1975; Marks and Kozlowski, 1973; Mori et al, 1977 and many others).

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  • English Grammar 50: 50 - Part 1 Many scientists believe that the dinosaurs were wiped out by a colossal meteor. According to this theory, a meteor ten kilometers wide hurtled into the Earth. This collision propelled dust and dirt into the sky. Imagine a really cloudy summer day. It’s a lot cooler, right? Well, every day was like that for a long time after the collision. Because it was much darker and cooler, many species of plants began to die. Soon, there was no food source for plant-eating dinosaurs, and when they died, there was no food source for meat-eating dinosaurs.

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