华北农牧交错带农田-草地界面土壤水分影响域分析

应用生态学报

华北农牧交错带农田-草地界面土壤水分影响域分析

刘洪来^1,3;张卫华²;王堃^1,3;赵娜¹

¹中国农业大学动物科学技术学院，北京 100193;²中国农业大学资源与环境学院，北京 100193;³河北沽源草地生态系统国家野外科学观测研究站，河北沽源 076550

收稿日期:2008-09-22 修回日期:1900-01-01 出版日期:2009-03-20 发布日期:2009-03-20

Edge influence of soil moisture at farmland-grassland boundary in agriculture-pasturage ecotone of Northern China.

LIU Hong-lai^1,3;ZHANG Wei-hua²;WANG Kun^1,3;ZHAO Na¹

¹College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;²College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China;³Guyuan National Grassland Ecosystem Field Station, Guyuan 076550, Hebei, China

Received:2008-09-22 Revised:1900-01-01 Online:2009-03-20 Published:2009-03-20

摘要/Abstract

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（0～20 cm）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6 m到农田4 m，总宽度10 m，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1 g·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.

关键词: 胞外多聚物, 微生物聚集体, 胞外蛋白, 蛋白分析技术

Abstract: 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.

Key words: extracellular polymeric substance, microbial assemblage, extracellular protein, protein analytical technique.

刘洪来^1,3;张卫华²;王堃^1,3;赵娜¹. 华北农牧交错带农田-草地界面土壤水分影响域分析[J]. 应用生态学报.

LIU Hong-lai^1,3;ZHANG Wei-hua²;WANG Kun^1,3;ZHAO Na¹. Edge influence of soil moisture at farmland-grassland boundary in agriculture-pasturage ecotone of Northern China.[J]. Chinese Journal of Applied Ecology.