Plant community responses to nitrogen addition and increased precipitation: the importance of water availability and species traits
Plant community responses to nitrogen addition and increased precipitation: the importance of water availability and species traits
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DOI：
10.1111/j.1365-2486.2011.02423.x
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发表时间：
2011-09
影响因子：
11.6
通讯作者：
Haijun Yang;Yang Li;Mingyu Wu;Zhe Zhang;Linghao Li;S. Wan
中科院分区：
文献类型：
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作者：
Haijun Yang;Yang Li;Mingyu Wu;Zhe Zhang;Linghao Li;S. Wan
全球氮(N)的增加和降水制度的变化可能会改变植物群落的结构和组成，从而影响生物多样性和生态系统的功能。研究了中国北部温带草原植物群落结构和组成对氮素添加和降水增加的响应。在连续6年(2005-2010年)的人工操作试验中，降水增加和N添加分别促进和抑制了群落物种丰富度。施氮量和降雨量的增加显著改变了植物群落的结构和组成。物种丰富度与土壤湿度(SM)之间的显著关系表明，在变化的环境条件下，植物群落结构受水分的调节。此外，株高对植物群落对氮素的响应起着重要作用，降雨量增加对植物群落的影响取决于树种的生根深度。我们的结果强调了在不断变化的环境情景下，非生物因素(SM)和生物因素(物种特征)在构建植物群落中的重要性和复杂性。这些发现表明，物种特征的知识有助于从机制上理解和预测植被动态，以响应未来的环境变化。
Global nitrogen (N) enrichment and changing precipitation regimes are likely to alter plant community structure and composition, with consequent influences on biodiversity and ecosystem functioning. Responses of plant community structure and composition to N addition and increased precipitation were examined in a temperate steppe in northern China. Increased precipitation and N addition stimulated and suppressed community species richness, respectively, across 6 years (2005–2010) of the manipulative experiment. N addition and increased precipitation significantly altered plant community structure and composition at functional groups levels. The significant relationship between species richness and soil moisture (SM) suggests that plant community structure is mediated by water under changing environmental conditions. In addition, plant height played an important role in affecting the responses of plant communities to N addition, and the effects of increased precipitation on plant community were dependent on species rooting depth. Our results highlight the importance and complexity of both abiotic (SM) and biotic factors (species traits) in structuring plant community under changing environmental scenarios. These findings indicate that knowledge of species traits can contribute to mechanistic understanding and projection of vegetation dynamics in response to future environmental change.