Decoupling the direct and indirect effects of nitrogen deposition on ecosystem function
Decoupling the direct and indirect effects of nitrogen deposition on ecosystem function
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DOI：
10.1111/j.1461-0248.2006.00959.x
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发表时间：
2006-09-01
期刊：
影响因子：
8.8
通讯作者：
Rees, Mark
中科院分区：
文献类型：
--
作者：
Manning, Pete;Newington, John E.;Rees, Mark
陆地生态系统氮素输入量的增加正在导致生态系统的组成和功能发生重大变化。了解这些变化是具有挑战性的，因为有复杂的相互作用之间的“直接”影响的N对植物生理和土壤地球化学，和“间接”的影响所造成的植物物种组成的变化。通过种植高N和低N植物群落组成到高和低N沉积模型陆地生态系统，我们实验解耦的直接和间接的影响，并量化其贡献的碳，氮和水循环的变化。我们的研究结果表明，对植物生长的直接影响占主导地位的生态系统对氮沉降的反应，虽然长期的碳储量减少下高氮植物物种组成。这些结果表明，氮沉降对生态系统功能的直接影响可能相对较强的植物群落变化的间接影响相比。
Elevated nitrogen (N) inputs into terrestrial ecosystems are causing major changes to the composition and functioning of ecosystems. Understanding these changes is challenging because there are complex interactions between 'direct' effects of N on plant physiology and soil biogeochemistry, and 'indirect' effects caused by changes in plant species composition. By planting high N and low N plant community compositions into high and low N deposition model terrestrial ecosystems we experimentally decoupled direct and indirect effects and quantified their contribution to changes in carbon, N and water cycling. Our results show that direct effects on plant growth dominate ecosystem response to N deposition, although long-term carbon storage is reduced under high N plant-species composition. These findings suggest that direct effects of N deposition on ecosystem function could be relatively strong in comparison with the indirect effects of plant community change.