科尔沁沙地植物功能性状的尺度变异及关联

doi:10.7522/j.issn.1000-694X.2014.00115

摘要/Abstract

摘要： 调查了科尔沁沙地流动沙丘、半固定沙丘和固定沙丘18个样地的物种组成,测定了28种植物的叶面积(LA)、比叶面积(SLA)和叶干物质含量(LDMC)等3个植物功能性状,并用性状梯度分析法对3个功能性状在群落水平上的变化进行了分解,研究了沙丘固定过程中的植物功能性状的尺度变异及其与生境变化的关系。结果表明:(1)随着沙丘的固定,群落平均LA逐渐增大,群落平均SLA及LDMC在半固定沙丘上最小;(2)群落平均SLA的生态位宽度随着沙丘固定程度依次减小,流动、半固定沙丘植物群落的适应能力较固定沙丘更强;(3)沙丘固定过程中物种性状值的变化与群落内共生植物种性状间变异的关联相比于群落间性状的变异更密切。沙丘固定导致了物种LA与LDMC较强的正相关关系,两性状在群落间的依赖性比群落内的强。物种在群落内和群落间采取不同的策略来适应沙丘固定过程生境的变化。

关键词: 性状梯度分析法, 群落平均性状值, 科尔沁沙地, 叶面积, 比叶面积, 叶干物质含量

Abstract: This paper investigated species composition of 18 plots in mobile dune, semi-fixed dune and fixed dune, measured 3 kinds of plant functional traits-leaf area (LA), specific leaf area (SLA) and leaf dry matter content (LDMC) from 28 plant species. Then we analyzed the variations of 3 functional traits on the community level, decomposed the species' trait values by adopting the trait-gradient approach (TGA) and studied the correlations between plant functional traits and variations of habitats along the gradient of sand dune fixation. The results show that: (1) community mean leaf area tend to increase with the fixation of sand dune; community mean SLA and LDMC reach the minimum values on the semi-fixed dune. (2) The community niche breadth, calculated by community mean SLA, decreases along the sand dune stabilization gradient, which illustrates that mobile dune and semi-fixed dune plant communities have wider distribution than fixed dune's; (3) The variations of trait values of species are more relative to co-occurring species than the change of mean trait values of plots in which they occur. Following the stabilizing process of sand dune, LA and LDMC have relatively strong positive relationship, and the dependence of theses 2 traits among communities is stronger than that among symbiotic species. Within and among communities, species adopted different strategies to adapt to the change of habitats in the process of sand dune fixation.

Key words: trait-gradient analysis, community mean trait values, Horqin sandy land, leaf area, specific area, leaf dry matter content

中图分类号:

Q948.11

周欣, 左小安, 赵学勇, 刘川, 吕朋. 科尔沁沙地植物功能性状的尺度变异及关联[J]. 中国沙漠, 2016, 36(1): 20-26.

Zhou Xin, Zuo Xiaoan, Zhao Xueyong, Liu Chuan, Lv Peng. Scale Variation and Correlation of Plant Functional Traits in the Horqin Sandy Land, China[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(1): 20-26.

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