科尔沁沙质草地不同水热梯度植物群落叶功能性状特征  

Leaf functional traits of plant community with different hydrothermal gradients in Horqin sandy grassland

作　　者：朱远忠 黄文达 于海伦 何远政 王怀海 史尚彬 寇志强 Zhu Yuanzhong;Huang Wenda;Yu Hailun;He Yuanzheng;Wang Huaihai;Shi Shangbin;Kou Zhiqiang(Naiman Desertification Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Water Conservancy Development Center of Inner Mongolia,Hohhot 010020,China)

机构地区：[1]中国科学院西北生态环境资源研究院奈曼沙漠化研究站,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]内蒙古自治区水利事业发展中心,内蒙古呼和浩特010020

出　　处：《中国沙漠》2024年第2期143-150,共8页Journal of Desert Research

基　　金：国家自然科学基金项目(41971144);国家重点研发计划项目(2017FY100205)。

摘　　要：植物功能性状可以响应生境的变化并决定生态系统的功能,探究植物功能性状间的关系及其随温度和降水梯度的变化规律,对认识不同气候条件下植被在群落水平碳水代谢关系和维持水分平衡的生理生态学机制具有重要意义。近年来,有关群落水平功能性状与环境因子关系的研究较少,尤其是半干旱区沙质草地植物群落功能性状对气候梯度响应的研究鲜有报告。因此,本研究以科尔沁沙质草地群落为研究对象,分析了温度和降水梯度上群落功能性状以及性状间的相关关系。结果显示:(1)随着区域温度增加(2.1~6.4℃)和降水减少(451.1~370.0 mm),沙质草地群落功能性状变化趋势不一。群落高度和叶面积随温度升高显著增加。群落高度、叶面积和比叶面积随降水减少显著降低,群落叶厚度、叶干物质含量和叶组织密度随降水减少显著增加。(2)群落高度与叶面积显著正相关,叶厚度与叶干物质含量显著正相关,叶面积、比叶面积与叶干物质含量、叶厚度显著负相关,叶组织密度与叶干物质含量呈显著负相关。(3)气候因素驱动了54.66%植物性状变异,其中降水是影响沙质草地群落功能性状的主要影响因子。Plant functional traits could respond to habitat variation and also determine ecosystem functions.Exploring the relationship between plant functional traits and their variation along hydrothermal gradients is of great significance for understanding the relationship between plant carbon and water metabolism of vegetation at community level and the physiological and ecological mechanism of maintaining water balance under different climatic conditions.In recent years,there are relatively few studies on the relationship between community level functional traits and environmental factors,especially the response of plant community functional traits to climate gradient in semi-arid sandy grassland.Therefore,this study was conducted using a community in Horqin sandy grassland,where the responses of community functional traits to hydrothermal gradients were analyzed.The results showed that:(1)Community functional traits had different changing trends with different hydrothermal gradients in sandy grassland.Community height increased significantly along increasing regional temperature.Community height,leaf area,specific leaf area decreased significantly along decreasing regional precipitation,while leaf thickness,leaf dry matter content,leaf tissue density significantly along increasing regional temperature.(2)Community height was significantly and positively correlated with leaf area and thickness was significantly and positively correlated with leaf dry matter content.Leaf area,specific leaf area were negatively correlated with leaf dry matter content,leaf thickness and leaf tissue density were negatively correlated with leaf dry matter content.(3)Results of redundancy analysis showed that climatic factors accounted for 54.66%of the variation of plant traits,precipitation was affecting the community functional traits of the main environmental factors in sandy grassland.

关 键 词：沙质草地 水热梯度 群落功能性状 冗余分析 

分 类 号：Q948[生物学—植物学]