黄土丘陵区植物功能性状的尺度变化与依赖

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 黄土丘陵区植物功能性状的尺度变化与依赖 DOI: 10.5846/stxb201307291974 作者: 作者单位: 西北农林科技大学资源环境学院,西北农林科技大学水土保持研究所,西北农林科技大学资源环境学院 作者简介: 通讯作者: 中图分类号: 基金项目: 中国科学院重要方向项目课题（KZCX2-EW-406）；国家自然科学基金项目（41271297） Scale change and dependence of plant functional traits in hilly areas of the loess region, Shaanxi Province, China Author: Affiliation: College of Resources and Environment,Northwest A＆F University,Institute of Soil and Water Conservation,Northwest A＆F University,College of Resources and Environment,Northwest A＆F University Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:研究植物功能性状随环境梯度的变化规律和性状间的相关性，对于认识不同环境梯度下群落构建和植物对环境的响应具有重要意义。以黄土丘陵区为研究区，调查了研究区内的32个样方的物种组成，测量了研究区内98种地带性植物的叶面积（LA）和比叶面积（SLA）两个功能性状值，并运用性状梯度分析法对这两个功能性状进行组分分解。结果表明：（1）随着水热环境梯度增大（降水增加，温度升高），物种叶面积逐渐增大，比叶面积逐渐减小；（2）在群落间，比叶面积按照乔木-灌木-草本顺序依次增大，且草本群落和灌木群落的生态位宽度较乔木的大，即在延河流域草本与灌木群落比乔木群落有着更广泛的分布。在群落内，物种相对于共生物种的比叶面积的变化大于沿着群落平均比叶面积梯度的变化；（3）叶面积和比叶面积两性状的相关性在群落间的依赖性比相对其共生物种群落内的依赖性要强，物种在群落内和群落间采取不同的适应策略来适应群落环境。 Abstract:Plant functional traits reflect the response of plants to environmental change. Understanding community assemblages and plant response to environmental change requires examining the variation in plant functional traits along environmental gradients, including the relationship among different traits. One important topic in ecological research is trait-gradient analysis used to explain relationships between plant traits and their environment.Plant functional traits have large variations in space. Understanding the variation patterns in functional traits and the correlations between different traits are the basis of adopting a trait-based approach. To understand how plant functional traits change across environmental gradients and plant trait variation within and among communities, we examined 32 vegetation plots in the Yanhe River basin, Shaanxi province. We measured two plant functional traits (leaf area and specific leaf area) of 98 species in these plots. We used trait-gradient analysis to reduce these two traits into α and β components, analyzing changes in species functional traits along environmental gradients using a combination of moisture and temperature, including the variation in plant traits within and among communities. The results showed that along the environmental gradient leaf area increased while specific leaf area decreased. Along the environmental gradient, species with larger leaves were represented more compared with smaller leaved species in the hilly loess region. Species gradually increased growth rates, reducing their nutrient-use-efficiency strategies to adapt to the environment. Among plant communities, using the β component of herb, shrub and tree communities, the species mean specific leaf area gradient was 2.56, 2.46 and 2.40. This indicated that species' specific leaf area increased in the order from tree-shrub-herb communities. In the Yanhe River basin, the niche breadth was 0.85, 0.73, and 0.5 for herb, shrub and tree communities, respectively. This finding suggests that herb and shrub communities were more widely distributed compared with tree communities. Within plant communities, the range of the α value was -0.857-1.578 and the range of the β value was 1.126-2.563, with the α value range wider compared with the β value range. This result suggests that the variation in plant species' specific leaf area, with respect to symbiotic species, was higher compared with the species community mean specific leaf area. Species mean leaf area and specific leaf area showed no correlation to environmental gradients. The α-component of species' specific leaf area and leaf area showed a non-significant correlation, while the β-component of species' specific leaf area and leaf area showed a significant correlation to environmental gradients. The dependence of the relationship between leaf area and specific leaf area within plant communities was stronger compared with those among symbiotic species. Species evolve different life-strategies to adapt to changing intra- and interspecific environments. Our findings provide an important guide for vegetation rehabilitation in the loess hilly region. 参考文献 相似文献 引证文献