摘要
植被对土壤水动态的影响研究对认识水循环机理和合理确定土地利用方式具有重要作用。论文以崇陵实验流域为研究对象,利用负压计对太行山区的3种典型植被荒草、刺槐和侧柏覆被下的土壤水势进行观测。通过土壤水势的动态变化可以看出,土壤水势在年内存在明显的季节变化,土壤水势在3～6月缓慢下降,7～8月波动上升,9～10月下降,且3种植被在丰水年的土壤水势差异大于枯水年。从土壤水势剖面可以看出,荒草地土壤水蒸散发消耗集中在0～50 cm土层,刺槐林地在0～90 cm都有较大水分消耗,侧柏林地在整个土壤剖面上具有较小的水分消耗。通过降水后土壤水势的变化可以看出,刺槐林地土壤对降水入渗的反应时间最快,侧柏林地土壤在雨后的持水性最好。
Different types of vegetations have different influence on soil water potential,and the study of this different influence is important for realizing water cycle mechanism and determining rational land utilization.In this study,we choose three typical representative vegetations（weeds,acacia and arborvitae） of Taihang mountainous region at Chongling catchment.The soil water potential has been observed by tensiometer,and combined with the soil water content measured,we get the soil water retention curve.Through the analysis of the dynamics of soil water potential of the three vegetations,we can find that the soil water potential descends from March to June,ascends in July and August with fluctuation,then descends in September and October again.And the differences among soil water potential of the three vegetation land are larger in wet years than that in dry years.Through analysis of the soil water potential profile,it is found that the soil water for evapotranspiration in weeds land is mainly from superficial zone,and acacia land from both superficial zone and deeper zone,while evapotranspiration of arborvitae is relatively smaller.The soil water in all depth zones are in a state of shrewd change,according to the higher value of coefficient of variation.Based on the changes of soil water potential after rain,it is found that the soil water of acacia land reacts the quickliest,and the soil water of arborvitae land is most retentive.
出处
《自然资源学报》
CSCD
北大核心
2009年第8期1467-1476,共10页
Journal of Natural Resources
基金
中国科学院知识创新工程方向性项目(KZCX-SW-317)
国家自然科学重点基金(40830636)
关键词
土壤水势
典型植被
负压计
降水入渗
太行山区
Taihang mountain region
typical vegetation
tensiometer
soil water potential
soil water potential
infiltration of precipitation
