摘要
在华北农牧交错区,选择线状边界的农田与草地典型区进行调查与土壤水分测定,采用移动窗口法,对农田-草地景观界面表层(0~20cm)土壤水分影响域进行研究.结果表明:界面水分的影响域为草地6m到农田4m,总宽度10m,属急变型界面;将农田-草地景观界面划分为3个功能区:农田功能区、草地功能区和农田-草地复合功能区.其中农田-草地复合功能区的土壤含水量变化剧烈,而草地功能区与农田功能区内土壤水分基本呈线性分布;草地生态系统土壤平均含水量比农田高约1g.g-1,这主要是由于草地开垦为农田后风蚀等作用而引起的土壤毛管持水力下降所致.作为植被覆盖不同的两个生态系统,不同的植物蒸腾和地表蒸发,可使不同功能区的土壤含水量产生明显差异,从而使土壤水势发生变化,使水分跨生态系统运移成为可能.
In the agriculture-pasturage ecotone of Northern China, a typical zone with linear boundary of cropland and grassland was chosen to investigate its soil moisture regime, and the moving split-window technique was adopted to study the edge influence of soil moisture at the boundary.The results showed that the edge influence was 10 m, from 6 m within grassland and 4 m within cropland, and was categorized as the acute change type boundary. Accordingly, the farmland-grassland landscape boundary could be divided into three functional zones, i. e. , grassland zone, farmland zone, and compositional ecotone zone. Soil moisture content varied abruptly in the ecotone zone, but presented linear distribution in both grassland zone and farmland zone. The average soil moisture content in grassland was about 1 g · g^-1 higher than that in farmland, which was mainly caused by the decreased capillary moisture capacity of farmland. Owing to the different vegetation cover, farmland and grassland had different transpiration and evaporation, which led to the diverse soil moisture regime, making soil water potential changed and water movement from one ecosystem to another possible.
出处
《应用生态学报》
CAS
CSCD
北大核心
2009年第3期659-664,共6页
Chinese Journal of Applied Ecology
基金
国家重点基础研究发展规划项目(2006AA10Z250)资助
关键词
华北农牧交错带
农田-草地生态系统
土壤水分
移动窗口法
agriculture-pasturage ecotone in Northern China
farmland-grassland ecosystem
soil moisture
moving split-window technique.