芨芨草群落土壤盐分特征  

Soil salinity and Achnatherum splendens distribution

作　　者：张雅琼[1] 梁存柱[1] 王炜[1] 王立新[1] 彭江涛[1] 闫建成[1] 贾成朕[1] 

机构地区：[1]内蒙古大学生命科学学院,中美生态、能源及可持续性科学内蒙古研究中心,呼和浩特010021

出　　处：《生态学杂志》2010年第12期2438-2443,共6页Chinese Journal of Ecology

基　　金：国家自然科学基金资助项目(30660119、30360016和31060076)

摘　　要：通过对内蒙古及青海9个样点芨芨草群落及其相邻地带性群落土壤电导率的研究,从区域大尺度及生境小尺度揭示了土壤盐分对芨芨草群落分布的影响,并基于土壤的盐分特征分析了芨芨草群落的植被属性。结果表明:在区域大尺度,芨芨草群落的分布与土壤盐分不存在直接的相关性,芨芨草既可以在低盐环境下形成群落,也可在盐分较高的环境下形成群落,是一个生态幅较宽的耐盐物种;而在相同地点的小尺度上,芨芨草群落的土壤含盐量总是比相邻地带性针茅群落的土壤含盐量高,地带性针茅群落的耐盐性不及芨芨草群落;青海地区大面积的芨芨草草原发育在含盐量较高的土壤环境,远高于相邻地带性针茅群落。土壤盐分特征分析结果表明,芨芨草群落表现出明显的非地带性植被特征,其分布与区域降水不存在直接的相关性。Achnatherum splendens distributes in the arid and semiarid areas of Eurasia, and has important ecological functions and multifold economic values. In this paper, the soil electric conductivity at 9 sites with the distribution of A. splendens and its adjacent zonal communities in Inner Mongolia and Qinghai was determined, aimed to reveal the effects of soil salinity on the spatial distribution of A. splendens community at habitat and regional scales, and to analyze the vegetation property of A. splendens community based on soil salinity characteristics. At regional scale, no direct correlation was observed between soil salinity and the distribution of A. splendens community. A. splendens could form community both on salt-rich and on salt-poor soils, being a saline-resistant plant with wide ecological amplitude. However, at habitat scale, A. splendens community was always found on the soil with higher salinity, compared with adjacent zonal Stipa community, implying that Stipa community was less saline-resistant. In fact, A. splendens had a wide distribution in high salinity soil environment in Qinghai, implying its azonal vegetation characteristic. The distribution of A. splendens community had no direct correlation with precipitation.

关 键 词：芨芨草群落 土壤电导率 土壤盐分 针茅群落 非地带性植被 

分 类 号：Q948.3[生物学—植物学]