【摘要】 深入认识和定量评价植被土壤层的水文调节功能,是干旱半干旱区生态工程建设和流域水土资源管理的重要科学依据。文中在宁夏六盘山北侧半干旱区的叠叠沟小流域,分析了4种典型植被(华北落叶松林、白桦林、沙棘灌丛和草地)100cm土层的土壤容重、持水能力和渗透性等土壤水文物理性质,运用坐标综合评定法定量评价了其土壤水文调节功能。结果表明:土壤容重(g/cm3)以沙棘灌丛(1.17)最高,白桦林、华北落叶松林和天然草地较接近(1.05~1.07);土壤总孔隙度表现为华北落叶松林(54.41%)>白桦林(53.30%)>天然草地(51.91%)>沙棘灌丛(50.11%);华北落叶松林和白桦林的蓄水性能和渗透性能要优于沙棘灌丛和草地。综合评价结果显示:白桦林地的土壤水文调节功能最强(0.0008),华北落叶松林地(0.0148)和沙棘灌丛(0.0678)次之,草地的土壤水文调节功能最差(0.2418)。更多还原

【Abstract】 A deep understanding and a quantitative evaluation of the hydrological adjusting function of soils in different vegetation types is beneficial for the ecological engineering and water and soil resource management in arid and semi-arid areas. This research investigated and analyzed the bulk density,water-holding capacity and permeability of 0-100 cm soil layers in three plantation plots( Larix principis-rupprechtii,Betula platyphylla,Hippophae rhamnoides) and one grassland plot in the semi-arid area of Liupan Mountains,and evaluated quantitatively the soil hydrological adjusting function by the method of comprehensive coordinate. Results showed the soil bulk density( g/cm3) was the highest in the Hippophae rhamnoides( 1. 17) plot,that was similar in the grassland,Larix principis-rupprechtii and Betula platyphyila( 1. 05-1. 07) plots. The total soil porosity ranked as: plot Larix principis-rupprechtii( 54. 41%),plot Betula platyphyila( 53. 30%),plot grassland( 51. 91%),plot Hippophae rhamnoides( 50. 11%). plot Larix principis-rupprechtii and plot Betula platyphyila had the best water-holding capacity and infiltration capacity,then were the plot Hippophae rhamnoides and the grassland. The comprehensive coordinate evaluation indicated the plot Betula platyphylla had the best soil hydrological adjusting function,followed by the Larix principis-rupprechtii and Hippophae rhamnoides plots,whereas the grassland was the worst.更多还原