【摘要】 为定量研究半干旱黄土丘陵区不同植被深层土壤水分的时空分异性特征,选择晋西北岢岚县为目标研究区域,对撂荒地、柠条林、小叶杨林3种林型4—7月份0—600cm深度剖面土壤水分的时空异质性特征进行了分析。研究结果表明:(1)3种植被4个月份内土壤含水量变化范围在3.34%~17.19%之间。在0—200cm深度土壤含水量变化没有明显规律,在200—600cm深度土层范围内,撂荒地、柠条林土壤含水量分别有升高和轻缓降低趋势,小叶杨林有先轻缓降低再轻缓升高趋势。(2)土壤含水量在4个月份间均存在显著性差异(p<0.01),不同月份不同植被类型土壤含水量总体分布差异性也都不同。(3)土壤含水量变异系数值大多集中在0~30%之间,个别土层深度变异系数值超过50%,表明土壤水含量总体上具有结构稳定性,但存在局部较强变异特征。更多还原

【Abstract】 The spatio-temporal heterogeneity of soil moisture in Kelan County,Northwestern Shanxi Province was studied in wasteland,Caragana korshinskii forest land and Populus simonii forest land.The soil moisture was determined for the 0—600cm profile in April,May,June and July.Results showed that:(1)Soil moisture changed between 3.34%~17.19% with irregular variation in the layer of 0—200cm;However,as the soil depth increased from 200 to 600cm,the soil moisture of wasteland was increasing,the soil moisture of Caragana korshinskii forest land was decreasing gently and the soil moisture of Populus simonii.forest land decreased at first and then increased gently,respectively.(2)The profile distribution of soil moisture had a significant difference(p<0.01)within different months and different land use types.(3)The variation coefficient of soil moisture was usually in the range of 0~30%,but some individual values are over 50%,suggesting that the structure of soil moisture presented overall stability except special points.更多还原