科尔沁沙地52种植物叶片性状变异特征研究  

Variations in Leaf Traits of 52 Plants in Horqin Sand Land

作　　者：赵红洋[1] 李玉霖[2] 王新源[2] 毛伟[2] 赵学勇[2] 张铜会[2] 

机构地区：[1]甘肃农业大学草业学院/草业生态系统教育部重点实验室/中-美草地畜牧业可持续发展研究中心,甘肃兰州730070 [2]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《中国沙漠》2010年第6期1292-1298,共7页Journal of Desert Research

基　　金：国家重点基础研究发展计划项目(2009CB421102);国家科技支撑计划课题(2006BAC01A12);国家自然科学基金项目(30870426)共同资助

摘　　要：研究严重沙化生境中植物叶片性状的变异特征,不仅有助于了解植物对区域环境变化的适应特征,而且还可以为群落分类、群落结构特征的揭示等提供重要的依据。本研究以科尔沁沙地52种植物为对象,比较不同功能群植物叶片性状的变异特征,分析植物各叶片性状之间的关系。结果表明,科尔沁沙地52种植物比叶面积在6.9～34.4m2·kg-1之间变动,与其他区域的研究结果相比,该区域植物比叶面积偏小,说明该区域植物能较好地适应贫瘠环境。52种植物中,大多数植物的氮磷比小于14,说明科尔沁沙地植物主要受氮制约。研究结果还表明,不同功能群植物的叶性状存在显著差异。固氮植物叶片氮含量最高,杂类草的叶干物质含量(平均值为0.22±0.06g·g-1)显著小于其他功能群植物,但是植物叶片磷含量和比叶面积在不同功能群之间差异不显著。相对于多年生植物,一年生草本植物的比叶面积显著偏大,但是叶干物质含量显著偏小。科尔沁沙地52种植物叶干物质含量分别与比叶面积和叶片氮含量呈显著负相关,叶片磷含量和氮含量之间呈显著正相关。Study of variations of leaf traits in severely desertified habitats is important not only to understand regional biotic and abiotic features,but also to provide basis for community classification.In this study,patterns of leaf traits of 52 plants are investigated to detect their difference among functional groups and relationships between each trait.The results show that specific leaf area of 52 plants is varied between 6.9-34.4 m2·kg-1,which was relatively lower compared with the results from other regions.This implies that the plants adapt well in poor soil environment in Horqin Sand Land.The N：P ratio of most plant in this study is less than 14,which means that the plant is constrained by nitrogen in Horqin Sand Land.One way ANVOA analysis shows that leaf traits are different significantly among functional groups.Leaf nitrogen content of N fixers and leaf dry matter content are the highest compared with other functional groups,respectively.However,no significant difference in leaf P concentration and specific leaf area is observed among different functional groups.Specific leaf area in annuals is significantly higher than that in perennials,but leaf dry matter content is relatively low in annuals.Leaf dry matter content of 52 plants is negatively correlated with specific leaf area and leaf nitrogen content,respectively.However,leaf nitrogen content is positively correlated with leaf phosphorus content.

关 键 词：比叶面积 叶片氮含量 叶片磷含量 功能群 

分 类 号：Q945.1[生物学—植物学]