黄土丘陵区土壤水资源与土地利用的耦合研究

Coupling of Soil Water and Land Use in Loess Hilly Region

依据延安燕沟流域一条支沟的26个定位监测点4～10月的土壤水分连续监测资料,结合土地利用现状、土壤容重、坡度、坡位等因素对土壤水分的影响,给出了流域内的农坡地、梯田、坝地、乔木、灌木、草地、鱼鳞坑、水平阶等8类土地利用下0～4 m的逐月土壤水分、土壤储水量。在Arcview环境下统计了流域0～1 m,1～2 m,2～3m,3～4 m及0～4 m不同层次土壤水资源量的月动态变化。同时,通过对土地利用演变的情景模拟,探索了农林草地利用格局发生变化后土壤水资源量随之变化的响应程度,进而提出了该区合理利用土地与生态治理的对策。

Based on the filed experiment in the projected Yangou watershed, Yan＇an city, the soil water of 26 sits under different land use and land cover had been surveyed during April to Oct. The soil water content and soil water volume had been analyzed accordingly with the land use type by coupling land use data and soil gravity data, and also the effects of slope grade and altitude on the soil water content. The soil water of 8 types land use had been compared and systematically analyzed including slope arable land, terrace land, silt dam land, arbor forest land, shrub land, pasture land, fish-scale pot land, and narrow level belt land in 0-4 m soil layer. Under Arcview environment the soil water in 0- 1 m, 1-2 m, 2-3 m, 3-4 m, and 0-4 m layers of the watershed as a whole had been given monthly from April to Oct. The four scenarios of land use had also been compared to study the effect of land use change on the soil water resources in the watershed. The results could help the on going ecoenvironment project named ＂grain for green＂ in loess region.