摘要
以位于农牧交错地带盐池县的6种不同草地类型土壤含水量为研究对象,通过监测各种类型草地0—100cm土层质量含水量的动态变化情况,运用Surfer制图软件分析牧草生育期土壤水分的空间分布特征;利用土壤水分平衡方程和土壤分层贮水量公式计算不同草地0—100cm土层总贮水量变化情况,结合试验地生长季降水量变化,分析了不同草地类型土壤贮水量动态变化与蒸散量的变化规律,结果表明:降雨和植被类型是不同类型草地土壤水分动态变化的主要原因,沙丘土壤水分随降雨量变化较为明显;移栽柠条地土层剖面生育期水分变异系数最大,表明干旱时土壤失水较多,降雨充足时蓄水最多。因此应增加沙丘植被覆盖,对柠条、苜蓿、草地应适度进行放牧和刈割,控制植被生长,减少植被蒸腾蒸发,提高土壤水分固持能力,维持土壤水分的可持续发展。
Six types of grasslands in Yanchi County of Ningxia arid zone were chosen as the research sites.Soil moisture monitoring in the depths ranging from 0cm to 100 cm in 6types grasslands was carried out,and spatial characteristics of soil moisture was analyzed by Surfer software.The total soil moisture storage of different depth was calculated by soil water balance equation,moreover,the change of soil moisture storage and evapotranspiration were analyzed based on the precipitation in the test plots of different grasslands in growing season.The results showed that rainfall and vegetation types were the main reason for soil moisture dynamic variation in different types in Ningxia farming pastoral zone,soil moisture variation of sand dune is more intense,and the coefficient of variation changed a lot in the field of transplanting Caragana korshinskii,indicating that soil water loss was the highest in the drought condition,and most moisture was maintained under the rainfall.So we should increase vegetation coverage of sand dune,and perform moderate mowing and grazing of eugenic vegetation in order to reduce vegetation evapotranspiration,and to keep the soil water resources to be long-term stable and sustainable.
出处
《水土保持研究》
CSCD
北大核心
2016年第1期23-28,共6页
Research of Soil and Water Conservation
基金
宁夏回族自治区科技攻关项目"宁夏中部地区植被恢复与水土资源可持续利用关键技术研究与示范"(KGZ-08-07-09)
