不同退化湿地土壤含水量纵向变化分析

Analysis of Longitudinal Change of Soil Water Content in Different Degraded Wetlands

以若尔盖湿地作为研究对象，测定了不同退化程度湿地的土壤水分含量，并分析其随土壤深度变化的纵向变化规律．结果表明，在典型苔草湿地中，土壤含水量主要受植被根系蓄水影响，在20cm深度左右含水量达最大．在轻度和中度退化湿地中，土壤含水量受植被根系蓄水和地下水的共同影响，土壤深度在20cm以内，随土壤深度增加而增加；土壤深度在20—65cm之间，土壤含水量随深度增加而减少；土壤深度在65cm以下，土壤含水量随深度增加而增加．在严重退化湿地中土壤含水量主要受地下水影响，随深度增加持续增加．

Taking the Zoige Wetland for example,the soil water content in different wetlands with different degradation was measured and its longitudinal change with soil depth was also studied in this paper. It is found that soil water content in the typical carex meyeriana wetland is affected mainly by plant storage and is amount to the maximum at 20 cm depth. In wetlands with mild and moderate degradation degree, soil wa- ter content is affected by plant storage as well as ground water. Soil water content rises with soil depth with- in 20 cm depth, fails from 20 cm to 65 cm and then rises again when the depth exceeds 65 cm. In wetlands with heavy degradation agree, soil water content is affected mainly by ground water and keeps rising with soil depth.