富营养化
生物多样性
草原
竞赛(生物学)
生态学
生态系统
环境科学
营养物
生物
作者
Yann Hautier,Pascal A. Niklaus,Andy Héctor
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2009-05-01
卷期号:324 (5927): 636-638
被引量:1070
标识
DOI:10.1126/science.1169640
摘要
Human activities have increased the availability of nutrients in terrestrial and aquatic ecosystems. In grasslands, this eutrophication causes loss of plant species diversity, but the mechanism of this loss has been difficult to determine. Using experimental grassland plant communities, we found that addition of light to the grassland understory prevented the loss of biodiversity caused by eutrophication. There was no detectable role for competition for soil resources in diversity loss. Thus, competition for light is a major mechanism of plant diversity loss after eutrophication and explains the particular threat of eutrophication to plant diversity. Our conclusions have implications for grassland management and conservation policy and underscore the need to control nutrient enrichment if plant diversity is to be preserved.
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