陕北毛乌素沙地土壤水分时空变异规律研究  

Studies on the spatio-temporal variation regularity of soil water in MuUs sandy land in north Shaanxi Province

作　　者：孙建华[1] 刘建军[2] 康博文[2] 黄海[1] 孙尚华[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]西北农林科技大学林学院,陕西杨凌712100

出　　处：《干旱地区农业研究》2009年第2期244-247,共4页Agricultural Research in the Arid Areas

基　　金：国家林业局948项目(2006-4-10)

摘　　要：对陕北毛乌素沙地流动、固定、半固定沙丘的土壤水分进行的长期动态观测结果表明,含水量排序为流动沙丘（8.47%）〉半固定沙丘（8.40%）〉固定沙丘（8.39%）。沙地含水量随土壤深度的变化存在着分布上的差异,随着深度的增加呈现先增加再减少的趋势,在0-60 cm土层,流动沙丘、半固定沙丘和固定沙丘土壤水分含量分别为8.08%、8.00%和8.03%,差异不显著;在60-200 cm土层,流动沙丘、半固定沙丘和固定沙丘土壤水分含量分别为8.65%、8.57%和8.53%,差异显著（P〉0.05）,其中60-140 cm层,流动沙丘、半固定沙丘和固定沙丘土壤水分含量分别为8.76%、8.62%和8.54%,差异极显著（P〉0.01）。固定沙丘、半固定沙丘大部分背风面的土壤含水量高于迎风面的含水量,但在流动沙丘上迎风面的土壤含水量却明显比背风面的高。在沙丘的不同部位含水量也存在差异,土壤含水量坡顶部〈坡中部〈坡底部,在沙丘下部的丘间土壤含水量明显高于丘顶部。另外,沙地水分还受季节变化的影响,具有明显的季节变异性。Long-term dynamic observation was made to monitor the soil water of mobile sand dune,fixed dune and half-fixed dune in MuUs sandy region.The results of the study showed that： the soil water content of different types of sandy land was in the order： mobile sand dune（8.47%）〉 half-fixed sand dune（8.40%）〉 fixed sand dune（8.39%）.The distribution of soil water of sandy land was different with the change of soil depth,they all showed the same trend that the soil water content increased at first and then decreased with the increasing of soil depth.In 0～60 cm soil layer,the soil water content of moving dune,semi-fixed dune and fixed dune was respectively 8.08%,8.00% and 8.03%,and the differences were not significant in this soil layer.In 60～200 cm soil layer,the soil water content of moving dune,semi-fixed dune and fixed dune was respectively 8.65%,8.57% and 8.53%,and the differences were more significant than those in 60cm layer.In 60～140 cm soil layer,the soil water content of moving dune,semi-fixed dune and fixed dune was respectively 8.76%,8.62% and 8.54%,and the differences were significant.The soil water content of fixed dune and half-fixed dune in leeside was higher than that in windward side,but the situation was adverse for mobile sand dune.In addition,the soil water was also in diversity in different positions of sand dune as the order of： top of dune 〈 middle of dune 〈 bottom of dune,and it was significant that the soil water difference between sandy land among the dunes and sand dune tops.The study also revealed that the soil water was affected by seasons,presenting obviously seasonal variability.

关 键 词：毛乌素沙地 沙地类型 土壤水分 时空变异 

分 类 号：S152.7[农业科学—土壤学]