【摘要】 土壤斥水性是指水分不能或很难湿润土壤颗粒表面的物理现象,具有斥水性的土壤称为斥水土壤。本文以内蒙古锡林浩特市白音锡勒牧场中国科学院内蒙古草原生态系统定位站的羊草样地为例,运用滴水穿透时间法分析了1979年禁牧1、999年禁牧、冬季放牧和连续放牧等条件下内蒙草原土壤斥水性的季节变化。结果表明:草原土壤总体上表现为轻度斥水性或无斥水性,且斥水性具有显著的季节变化特点,一般在雨季或多雨年土壤具有较强的斥水性;不同的利用方式对草原土壤斥水性的季节变化规律具有一定的影响,存在时间上的滞后性,持续放牧处理在雨季较多的样点最先表现斥水性,其次为冬季放牧处理,然后为1999年禁牧处理,最后为1979年禁牧处理。更多还原

【Abstract】 Soil water repellency is a physical phenomenon in which water can not or be very difficult to wet the soil surface,and the soil is called water repellent soil. The study area was the Leymus chinensis steppe plot of Inner Mongolia grassland ecosystem research station of the Chinese Academy of Sciences,located in the Baiyinxile pasture in Xilinhaote of the Inner Mongolia.The objective of this study was to find out soil water repellency in grasslands of Inner Mongolia as influenced by different grassland utilization patterns(including ungrazed since 1979 and 1999,winter grazing and continuous grazing) using water drop penetration time(WDPT).The results showed that the slightly hydrophobic or hydrophilic soil samples were often observed,and soil water repellency showed stronger during rainy season or rainy year than during no rainy season or dry year.And its seasonal change was affected by grazing intensity,which is that many dydrophobic soil samples are found earlier in continuous grazing plot,later in winter grazing plot and ungrazing plot since 1999,then in ungrazing plot since 1979.更多还原