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通过对陇中黄土丘陵区不同土地利用类型下土壤水分的定期观测,用烘干法测定了5种土地利用类型的土壤水分,分析了土壤水分在植被生长季的变化。结果表明:土地利用类型对土壤水分的影响差异极显著(P<0.01),土壤含水量及储水量大小顺序为:荒草地>沙棘林地>农地>草地>油松林地;土地利用类型对土壤剖面水分的影响随土层的加深呈增大趋势,土壤剖面水分的变异系数随土层的加深呈减小趋势,并且其含水量变化存在季节差异。不同土地利用类型下土壤水分消耗量及补充量均有差异;土壤剖面储水量的盈亏状况为:农地没有亏缺,荒草地的亏缺量最小,油松林地在40cm以下土层均亏缺。因此,在该区的生态植被恢复过程中,应优先考虑草本和灌木植物,以利于土壤水环境及其永续利用。
Through the regular observation of soil moisture under different land use types in Longzhong loess hilly region, the soil moisture of five land use types was determined by drying method, and the variation of soil moisture during vegetation growth season was analyzed. The results showed that the effects of land use types on soil moisture were highly significant (P <0.01). The order of soil water content and water storage was as follows: wild grassland> seabuckthorn forest land> agricultural land> grassland> pine forest land; The influence of profile moisture increases with the deepening of soil depth. The coefficient of variation of soil water profile decreases with the deepening of soil depth, and there is a seasonal difference in the variation of water content. The soil water consumption and supplementation varied with different land use types. The profit and loss status of soil water in section was as follows: there was no deficit in farmland, the smallest deficit in wild grassland, and less than 40cm in pine soil . Therefore, in the process of ecological vegetation restoration in this area, herbaceous and shrub plants should be given priority to facilitate the soil water environment and its sustainable use.