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Human Domination of Earth's Ecosystems
Human alteration of Earth is substantial and growing. Between one-third and one-half of the land surface has been transformed by human action; the carbon dioxide concentration in the atmosphere hasExpand
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Nitrogen is a key element controlling the species composition, diversity, dynamics, and functioning of many terrestrial, freshwater, and marine ecosystems. Many of the original plant species livingExpand
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Terrestrial ecosystem production: A process model based on global satellite and surface data
This paper presents a modeling approach aimed at seasonal resolution of global climatic and edaphic controls on patterns of terrestrial ecosystem production and soil microbial respiration. We useExpand
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Biological invasions by exotic grasses, the grass/fire cycle, and global change
Biological invasions into wholly new regions are a consequence of a far reaching but underappreciated component of global environmental change, the human-caused breakdown of biogeographic barriers toExpand
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Significant Acidification in Major Chinese Croplands
Cropland Acidification in China China is experiencing increasing problems with acid rain, groundwater pollution, and nitrous oxide emissions. Rapid development of industry and transportation hasExpand
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Enhanced nitrogen deposition over China
China is experiencing intense air pollution caused in large part by anthropogenic emissions of reactive nitrogen. These emissions result in the deposition of atmospheric nitrogen (N) in terrestrialExpand
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Consequences of changing biodiversity
Human alteration of the global environment has triggered the sixth major extinction event in the history of life and caused widespread changes in the global distribution of organisms. These changesExpand
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Terrestrial phosphorus limitation: mechanisms, implications, and nitrogen-phosphorus interactions.
Nutrient limitation to primary productivity and other biological processes is widespread in terrestrial ecosystems, and nitrogen (N) and phosphorus (P) are the most common limiting elements, bothExpand
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Nutrient Cycling and Nutrient Use Efficiency
Forest ecosystems systematically produce more litterfall dry mass per unit of nitrogen in sites with less aboveground nitrogen circulation. This pattern is observed both within and among tropical,Expand
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Litterfall, Nutrient Cycling, and Nutrient Limitation in Tropical Forests
Patterns of nitrogen, phosphorus, and calcium cycling through litterfall were evaluated using published information from 62 tropical forests. In general, lowland tropical forests have more nitrogenExpand
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