黄土丘陵区不同土地利用方式下土壤水分分析

采用定位监测法,对地处黄土丘陵区的延安燕沟不同植被类型下土壤水分状况进行了对比分析。结果表明:农林草地土壤水分剖面(0~4 m)存在显著差异,平均土壤含水量由高到低依次为:旱农坡地>草地>柠条灌丛>果园>黄刺玫灌丛>刺槐,与旱农坡地对照分别相差2.04%、2.27%、4.75%、4.8%和5.68%;刺槐、柠条和黄刺玫的土壤水分垂直分布呈现较一致的趋势,表现为上层水分高于下层且差异显著,水分较明显的分界点在100cm左右,其100 cm以上平均土壤湿度分别为10.12%、13.58%和11.89%,100 cm以下分别为8.79%、12.16%和9.07%;同时,不同植被类型下土壤剖面低湿层不同,乔灌地低湿层深度较农地和草地深;土壤水分剖面形态与分层特征受植被利用影响作用显著。

A study on soil moisture under different vegetations in loess hilly region

Based on the data collected by random survey in loess hilly region,the characteristics of soil moisture under different vegetations were analyzed.The results showed that there were considerable differences of soil moisture profile(0~4m) among various land uses.According to the average value of soil moisture,the lands could be ranked as: farmland>pasture land>Carangana korshinskill land>orchard land>Rosa xanthina Lindl land>Robinia peseudoacacia land;the differences of soil moisture between farmland and the other 5 lands were 2.04%,2.27%,4.75%,4.8% and 5.68% respectively.The vertical distribution of soil moisture of Robinia peseudoacacia land,Carangana korshinskill land and Rosa xanthina Lindl land was accordant,i.e.,the soil moisture of the upper layer was markedly higher than that of the lower layer;the average moisture content in 0~100cm was 10.12%,13.58% and 11.89% respectively,and that below 100cm was 8.79%,12.16% and 9.07% respectively.At the same time,different land uses caused the differences of soil moisture profiles.The main differences of soil moisture existed between the surface layer and the deep layer,which showing that the types of land use and land coverage were the main reason affecting the depth of water use.