CAN Canopy Addition of Nitrogen Better Illustrate the Effect of Atmospheric Nitrogen Deposition on Forest Ecosystem?

CAN Canopy Addition of Nitrogen Better Illustrate the Effect of Atmospheric Nitrogen Deposition on Forest Ecosystem?
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冠层添加氮能更好地说明大气氮沉降对森林生态系统的影响吗?

DOI:
10.1038/srep11245
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发表时间:
2015-06-10
期刊:
影响因子:
4.6
通讯作者:
Fu S
Fu S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhang W;Shen W;Zhu S;Wan S;Luo Y;Yan J;Wang K;Liu L;Dai H;Li P;Dai K;Zhang W;Liu Z;Wang F;Kuang Y;Li Z;Lin Y;Rao X;Li J;Zou B;Cai X;Mo J;Zhao P;Ye Q;Huang J;Fu S

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大气氮沉降的增加会对森林群落结构和生态系统功能产生深刻影响。然而,传统的实验与林下除了N(UAN)在很大程度上忽略了冠层相关的生物群和过程,因此可能无法真实地模拟大气氮沉降对森林生态系统产生可靠的影响。在这里,我们,第一次,设计了一个新的实验与冠层添加N(CAN)与UAN和审查的优点和缺陷的两种方法。将检验以下假设:i)UAN高估了N添加对林下和土壤过程的影响,但低估了对冠层相关生物群和过程的影响,ii)低水平N添加,CAN有利于冠层树种和冠层栖息生物群,促进碎屑食物网,iii)高水平N添加,CAN抑制冠层树种和其他生物群,有利于根际食物网。作为一个长期的综合性项目,该实验将为多学科合作提供机会,包括地球化学,微生物学,动物学和植物科学,以研究森林生态系统对大气氮沉降的响应。
Increasing atmospheric nitrogen (N) deposition could profoundly impact community structure and ecosystem functions in forests. However, conventional experiments with understory addition of N (UAN) largely neglect canopy-associated biota and processes and therefore may not realistically simulate atmospheric N deposition to generate reliable impacts on forest ecosystems. Here we, for the first time, designed a novel experiment with canopy addition of N (CAN) vs. UAN and reviewed the merits and pitfalls of the two approaches. The following hypotheses will be tested: i) UAN overestimates the N addition effects on understory and soil processes but underestimates those on canopy-associated biota and processes, ii) with low-level N addition, CAN favors canopy tree species and canopy-dwelling biota and promotes the detritus food web, and iii) with high-level N addition, CAN suppresses canopy tree species and other biota and favors rhizosphere food web. As a long-term comprehensive program, this experiment will provide opportunities for multidisciplinary collaborations, including biogeochemistry, microbiology, zoology, and plant science to examine forest ecosystem responses to atmospheric N deposition.
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