摘要
植物性状反映了植物对生长环境的响应和适应,将环境、植物个体和生态系统结构、过程与功能联系起来,研究植物功能性状特征及其随坡向梯度的变化规律,对认识不同环境梯度下植物群落的形成及其对环境的适应机制具有重要意义。以高寒草甸植被为研究对象,测定了阴阳坡植物功能性状和土壤元素含量。结果表明:阳坡阴坡不同生境的土壤含水量、土壤全磷含量和有机质含量的变化均为阳坡<阴坡;土壤全氮含量在阳坡阴坡的变化不明显,而土壤氮磷比和pH值的变化均为阳坡>阴坡。阴阳坡上的植物功能性状除叶片氮含量变化不明显外,其它如叶片磷含量和比叶面积均表现出阴坡>阳坡,而叶片氮磷比则是阴坡显著小于阳坡。植物功能性状随坡向的规律性变化,反映了高寒草甸植被群落构建过程中环境对植被的筛选效应。相关分析表明:阴阳坡土壤含水量和土壤养分是影响植物功能性状的重要因子,其中土壤含水量为主导因子。
Plant traits link environmental factors, individuals and ecosystem structure and functions as plants respond and adapt to the environment. The characteristics of plant functional traits and variation law by envi ronmental changes are important to understand plant community composition and adaptation mechanism in different environmental gradients. Plant functional traits and soil element contents were studied along north facing slope to south facing slope in the alpine meadow. The results showed that the variation of the soil wa ter content, the total phosphorus and soil organic carbon in different habitats from south-facing slope to north-facing slope were in the sequence of south-facing slope〈north-facing slope, whereas soil total nitrogen content did not change significantly in the south-facing and north-facing slope, soil N ： P ratio and pH chan ges followed the order of south-facing slope）north-facing slope. The plant functional traits of leaf phosphorus content （LPC） and specific leaf area （SLA） of the habitat from south-facing slope to north-facing slope were in the order of north-facing slope〉south-facing slope, except that leaf nitrogen content, but leaf N ： P ratio of north-facing slope were significantly less than the south-facing slope. Plant functional traits with the aspect of regular changes reflected the environmental filtering effects in the process of vegetation community forming in an alpine meadow. Correlation analysis showed that soil water content and soil nutrients were the important factors affecting plant functional traits in south-facing slope to north-facing slope, and soil water content was the dominant factor.
出处
《水土保持研究》
CSCD
北大核心
2013年第1期102-106,共5页
Research of Soil and Water Conservation
基金
国家自然科学基金(30970465)
甘肃省教育厅研究生导师项目(0901-07)
甘肃省自然科学基金项目(1107RJZA174)
关键词
植物功能性状
阳坡
阴坡
环境筛选
高寒草甸
plant functional traits
south-facing
north-facing
environmental filtering
alpine meadow
