摘要:研究植物功能性状变异，有助于揭示植物对环境的适应策略以及群落构建机制。以漓江河岸带木本植物为研究对象，利用广义线性模型和"varcomp"函数对漓江河岸带主要木本植物的3个叶功能性状（比叶面积SLA；叶面积LA；叶厚度LTH）跨不同尺度（样方、物种、个体、叶）变异进行方差分解，分析各尺度的相对贡献及变异的主要来源。结果表明：（1）植物功能性状在4个巢式尺度的解释方差规律较一致，均表现为物种（0.51-0.70） > 个体（0.21-0.22） > 叶和残差（0.09-0.20） > 样方（0-0.07）；（2）4个功能性状种间尺度的解释方差均最大（SLA、LA和LTH分别为64%、70%和51%）；其次种内尺度的解释方差（SLA、LA和LTH分别为34%、30%和42%）仅次于种间。（3）样方尺度的解释方差很小甚至为零。发现：（1）植物功能性状变异主要由种间变异驱动；（2）种内性状变异是功能性状变异的重要且不容忽视的来源；（3）生境过滤并非直接作用于群落间物种组成，而可能是通过直接作用于植物功能性状的总体分布来影响植物群落构建过程，基于功能性状的生境过滤可能在漓江河岸带植物群落构建中起重要作用。



Abstract:A knowledge of plant functional trait variation can help us understand the adaptation strategies of plants to the changing environment and community assembly rules. In this study of a riparian zone in Lijiang River, Southwest China, we investigated three key functional traits from 5418 individuals of 51 species to understand the variation in functional traits of woody plants. These functional traits were (1) specific leaf area[SLA], (2) leaf area[LA], and (3) leaf thickness[LTH]. We performed a generalized linear model and ‘varcomp’ function to partition the variance in the three key functional traits across four nested scales which were plot, species, individual, and leaf in riparian plant communities of the Lijiang River. We found that there were significant differences in the explanation variance of the three key functional traits of main woody plants on the four nested ecological scales in this riparian zone. However, the relative contributions of all three traits across four nested ecological scales were similar and species, individual, leaf and error, and plot explained 0.51-0.70, 0.21-0.22, 0.09-0.20 and 0-0.07 of the total variance, respectively. For all traits, the interspecific variability was the greatest for specific leaf area, leaf area, and leaf thickness were 64%, 70%, and 51%, respectively and was higher than the intraspecific variability for specific leaf area, leaf area, and leaf thickness, which were 34%, 30%, and 44%, respectively. The plot level accounted for a very small percentage of the total variance, despite relatively high species turnover between plots. These results suggest that the variation of plant functional traits was dominated by interspecific variation but also showed a substantial amount of intraspecific trait variability. Thus, the intraspecific variation of functional traits should be taken into account if we want to better understand the assembly rules in plant communities. The lowest or even the lack of variance at the plot level provides substantial support for the idea that trait-based habitat filtering could play an important role in plant community assembly.





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