Contrasting trait responses in plant communities to experimental and geographic variation in precipitation.
Contrasting trait responses in plant communities to experimental and geographic variation in precipitation.
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DOI：
10.1111/j.1469-8137.2010.03382.x
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发表时间：
2010-10
期刊：
影响因子：
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通讯作者：
B. Sandel;Leah J. Goldstein;Nathan J B Kraft;J. Okie;M. Shuldman;D. Ackerly;E. Cleland;K. Suding
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文献类型：
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作者：
B. Sandel;Leah J. Goldstein;Nathan J B Kraft;J. Okie;M. Shuldman;D. Ackerly;E. Cleland;K. Suding
·降水模式可能在未来世纪发生重大变化，对植物群落产生重要但知之甚少的影响。实验和相关研究可能会提供洞察预期的变化，但很少有研究已经解决了这些方法之间的一致性程度。·我们综合了四项实验性加水研究的结果，并对美国大自然降水梯度上的群落变化进行了相关分析。我们调查了是否社区组成，总结与植物功能性状，响应类似的研究和网站之间的降水量增加。·在田间试验中，降水量增加有利于种子大小小、叶片寿命短和叶片氮浓度高的物种。然而，随着降水量的增加沿着自然梯度，群落组成转向物种具有较高的平均种子质量，较长的叶片寿命和较低的叶片氮浓度。实验操作和自然梯度在时间和空间尺度上的差异可以解释这些对比结果。我们的研究结果强调了对气候变化的复杂性，并表明，短暂的动态可能无法反映功能多样性和社区组成的长期变化。我们提出了一个社区变化的模型，将这些差异之间的短期和长期的气候变化的反应。
• Patterns of precipitation are likely to change significantly in the coming century, with important but poorly understood consequences for plant communities. Experimental and correlative studies may provide insight into expected changes, but little research has addressed the degree of concordance between these approaches. • We synthesized results from four experimental water addition studies with a correlative analysis of community changes across a large natural precipitation gradient in the United States. We investigated whether community composition, summarized with plant functional traits, responded similarly to increasing precipitation among studies and sites. • In field experiments, increased precipitation favored species with small seed size, short leaf life span and high leaf nitrogen (N) concentration. However, with increasing precipitation along the natural gradient, community composition shifted towards species with higher mean seed mass, longer leaf life span and lower leaf N concentrations. • The differences in temporal and spatial scale of experimental manipulations and natural gradients may explain these contrasting results. Our results highlight the complexity of responses to climate change, and suggest that transient dynamics may not reflect long-term shifts in functional diversity and community composition. We propose a model of community change that incorporates these differences between short- and long-term responses to climate change.