贝加尔针茅草甸草原主要植物与功能群的叶片性状对增氮增雨的响应

发布时间：2018-06-02 13:47

本文选题：增氮 + 增雨　；参考：《东北师范大学》2015年硕士论文

【摘要】：全球变化会对陆地生态系统产生深刻的影响。草地植物作为生态系统初级生产力的主体,对全球变化的响应决定了草地生态系统的结构和功能以及未来的发展状态,并对生态系统的服务功能有一定的影响。植物功能性状有很强的可塑性,它能够随环境的改变而发生变化,所以其对全球变化具有极其重要的指示作用。本实验以中国东北贝加尔针茅草甸草原为研究对象,通过模拟氮沉降和增加降水,研究了几种常见植物叶片功能性状和功能群叶片性状的变化,以及功能群叶片性状与群落的盖度、密度、生物量之间的相关关系。主要结论如下:(1)在物种水平上,阿尔泰狗娃花的叶片性状可塑性最高,其次是羊草、贝加尔针茅;在功能群水平上,禾草功能群对增氮的敏感性最高,杂类草功能群对增水的敏感性最高。(2)在不同增氮增雨处理下,不同植物功能群叶片性状之间的相关关系基本表现出一致的变化规律。(3)植物群落特征的三个指标中盖度与主要植物叶片性状之间的相关性最大,密度与叶片性状之间的相关性最小。(4)土壤N含量与各功能群的叶片性状之间的相关性最大,土壤p H和土壤C含量与叶片性状之间的相关性较小。(5)综上分析认为,贝加尔针茅草甸草原中阿尔泰狗娃花,禾草功能群对增氮增雨具有较好的指示作用。
[Abstract]:Global change has profound implications for terrestrial ecosystems. Grassland plants as the main body of primary productivity of ecosystem, the response to global change determines the structure and function of grassland ecosystem and the future development state, and has certain influence on ecosystem service function. Plant functional traits have strong plasticity, which can change with the change of environment, so it is very important to indicate the global change. In this experiment, the changes of leaf functional characters and functional group leaf traits of several common plants were studied by simulating nitrogen deposition and increasing precipitation in the steppe of Stipa baicalensis meadow in northeast China. And the correlation between leaf traits of functional groups and community coverage density and biomass. The main conclusions are as follows: (1) at the species level, the leaf character plasticity of Altaidae was the highest, followed by Leymus chinensis and Stipa Baikal, and at the functional group level, the grass functional group had the highest sensitivity to nitrogen increase. The sensitivity of the functional group of hybrid grass to increasing water was the highest. 2) under different nitrogen and rain increasing treatments, The correlation between leaf traits of different plant functional groups showed the same variation law. 3) the correlation between coverage and main plant leaf traits was the highest among the three indexes of plant community characteristics. The correlation between soil N content and leaf characters of functional groups was the highest, and the correlation between soil pH and soil C content was smaller than that between leaf traits. The functional groups of Altay and grass in the meadow of Stipa baicalensis have a good indicative effect on nitrogen and rain.
【学位授予单位】：东北师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S812

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