Shifts In Lake N:P Stoichiometry And Nutrient Limitation Driven By Atmospheric Nitrogen Deposition
SCIENCE(2009)
摘要
Human activities have more than doubled the amount of nitrogen (N) circulating in the biosphere. One major pathway of this anthropogenic N input into ecosystems has been increased regional deposition from the atmosphere. Here we show that atmospheric N deposition increased the stoichiometric ratio of N and phosphorus (P) in lakes in Norway, Sweden, and Colorado, United States, and, as a result, patterns of ecological nutrient limitation were shifted. Under low N deposition, phytoplankton growth is generally N-limited; however, in high-N deposition lakes, phytoplankton growth is consistently P-limited. Continued anthropogenic amplification of the global N cycle will further alter ecological processes, such as biogeochemical cycling, trophic dynamics, and biological diversity, in the world's lakes, even in lakes far from direct human disturbance.
更多查看译文
关键词
phosphorus,nutrients,water pollution,aquatic plants,nitrogen cycle,trophic levels,atmosphere,nitrogen,biogeochemical cycle,eutrophication,biodiversity,biological diversity,cycling
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要