摘要
土壤含水量是制约植物生长的主要因子之一。运用变异系数和ArcGIS中反距离权重法插值对金塔县金塔绿洲和鼎新绿洲天然胡杨林土壤含水量的空间变化规律进行研究。结果表明:金塔县金塔绿洲和鼎新绿洲天然胡杨林土壤含水量垂直变化趋势表现为,除双城(SCCD)土壤含水量随深度增加而呈增加趋势外,其它各点土壤含水量0—60cm呈减少趋势,在60—120cm深度火烧(HSCD)与拐坝林场(GBLC)两样点土壤含水量继续缓慢减少,大庄子(DZZC)、五星(WXCD)、牛头湾(NTWC)、西红(XHCD)土壤含水量呈现增加趋势,且双城(SCCD)土壤含水量最大。各层土壤水分变异系数差异明显,且随深度增加而增大。土壤含水量越大,胡杨长势越好。各土层土壤水分含量水平空间分布大体呈自西向东逐渐增加的趋势,这与北大河和黑河流域地貌格局有关,各土层土壤含水量水平空间分布随离水源地距离的增加而降低。
The soil water was one of the factors restricting the growth of plants.The paper analyzed the spatial variation of soil water of natural Populus euphratica forest stand in Jinta County,Gansu Province by using the methods of coefficient of variation（Cv） and ArcGIS（Inverse Distance Weighted,IDW） interpolation.Soil water in SCCD decreased with the soil depth increasing.The soil water in the other 6 sample areas in the 0—60 cm layer decreased.In the 60—120 cm soil layer,the soil water in HSCD and GBLC layer kept on decreasing,while in DZZC,WXCD,NTWC,XHCD,the soil water started to increase.The average soil water in SCCD was the largest.The coefficient of variation of the soil water was obviously different in each layer and became larger with the increase of depth.The Populus euphratica grew better as the soil water increased.The soil water of horizontal direction in profile presented the similar characteristics of increase from west to east.This change was related with the topographical features of Beida river and Heihe river basin.The soil water along the horizontal direction in profile decreased with the distance away from water source.
出处
《水土保持研究》
CSCD
北大核心
2012年第1期51-55,共5页
Research of Soil and Water Conservation
基金
国家自然科学基金项目(40961035)
关键词
金塔
天然胡杨林
土壤含水量
空间变化
Jinta County of Gansu Province
natural Populous euphratica forest stand
soil water content
spatial variability
