强降雨事件对不同演化阶段白刺灌丛沙堆土壤水分的影响  

Influence of Heavy Rain Event on Soil Water Content of Nitraria tangutorun Nebkhas in Different Succession Periods

作　　者：杜建会[1] 严平[1] 俄有浩[2] 韩富贵[3] 

机构地区：[1]北京师范大学资源学院,北京100875 [2]北京师范大学 资源学院,北京100875 [3]甘肃省荒漠化防治重点实验室,甘肃武威733000

出　　处：《水土保持通报》2007年第6期20-24,共5页Bulletin of Soil and Water Conservation

基　　金：新世纪优秀人才支持计划项目(NCET-05-148);甘肃省荒漠化防治重点实验室开放基金(KD200602);国家科技攻关计划资助项目(2005BA517A06)

摘　　要：强降雨事件对干旱区植被土壤水分空间变异有着很大的影响。通过测定民勤县一次强降雨(47.6 mm)事件前后不同演化阶段白刺灌丛沙堆的土壤水分,分析了它对不同演化阶段白刺灌丛沙堆土壤水分及其贮量的影响。结果表明,(1)不同演化阶段灌丛沙堆土壤水分在1 m土层内垂直方向上的变化趋势一致。雏形阶段土壤水分垂直方向上变异最大且变化不稳定,稳定阶段土壤水分垂直方向上变异最小。(2)不同演化阶段白刺灌丛沙堆土壤水分补给深度存在很大差异。发育阶段和活化阶段土壤水分补给最大深度为50 cm,雏形阶段和稳定阶段土壤水分补给最大深度为30 cm。(3)不同演化阶段土壤水分补给总量差异较大。发育阶段补给总量最大,占总降雨量的74.66%～90.06%;稳定阶段补给总量最小,占总降雨量的12.27%～12.86%。Heavy rain event has a significant influence on soil water content in arid area. Through field investigation on soil water content under Nitraria tangutorun nebkhas in different sucession periods before and after a heavy rain event（47.6 mm）at Minqin County, its effects on soil water content and reservation of nebkhas were analyzed. Results indicate that （1） soil water content and reservation of nebkhas in different succession periods have a consistent variation trend in 1 m thick soil layer. The range of vertical variation for soil water content is biggest in rudimental period and it has a most unstabilized variation. Stabilized period has another extreme. （2） Soil water content replenishment depths of nebkhas in different succession periods are different from each other. Maximum soil water content replenishment depth of nebkhas in developing and degrading period is 50 cm and in rudimental and stabilizing period, 30 cm. （3） The total amounts of soil water content replenishment in different succession periods are different from each other. The total amount of soil water content replenishment in developing period is the biggest, about 74.66%-90.06% of the total precipitation and in stabilizing period, the smallest, about 12.27%-12.86% of the total precipitation.

关 键 词：民勤县 强降雨 灌丛沙堆 水分贮量 

分 类 号：S152.75[农业科学—土壤学]