羊草草原不同退化阶段群落蒸散量比较  

Evapotranspiration of Leymus chinensis steppe community at its different deteriorated phases

作　　者：王静[1] 宝音陶格涛[2] 

机构地区：[1]华东师范大学资源与环境科学学院环境科学系,上海200062 [2]内蒙古大学生命科学学院,呼和浩特010021

出　　处：《生态学杂志》2007年第8期1148-1152,共5页Chinese Journal of Ecology

基　　金：国家重点基础研究发展规划项目(2007CB106807);国家自然科学基金资助项目(30460086)

摘　　要：运用微型蒸渗仪法对重度、中度和无退化羊草草原群落的日蒸散量进行了测定,并对其与土壤含水量、日均气温、大气湿度等因子的相关关系进行了分析。结果表明:各群落的日蒸散量均随着生长季推移逐渐增大,于6月中旬至7月中旬达到最大,而后逐渐降低;表层土壤含水量和日均气温是影响群落日蒸散量的主要因子,这2个因子与群落日蒸散量的回归关系极显著;群落生长季的累积蒸散量随着羊草草原群落的退化程度加深逐渐降低,且该值均低于生长季累积降水量。By using micro-lysimeter, this paper measured the daily evapotranspiration of Leymus chinensis steppe community at its heavily deteriorated, moderately deteriorated, and non-deterio- rated phases. The results showed that at all phases, the daily evapotranspiration of the community increased with its growth, being the maximum from mid June to mid July, and decreased then. Daily mean air temperature and soil water content were the main factors affecting the evapotranspiration of the community, and significant correlations were observed between the evapotranspiration and these two factors. The accumulated evapotranspiration in the whole growth season decreased with the deterioration of the community, and its amount was always lower than the accumulated precipitation.

关 键 词：退化群落 蒸散量 土壤含水量 平均气温 

分 类 号：S812[农业科学—草业科学]