岷江上游山地森林/干旱河谷交错带几种植被类型土壤含水量研究

Soil Water Contents of Different Vegetation Types in the Ecotone between Dry-hot Valley and Mountain Forest in Upper Reaches of the Minjiang River

采用烘干法和环刀法对土壤物理性质进行测定,重点了解岷江上游山地森林/干旱河谷交错带的不同植被类型下0~40 cm土壤含水量的变化。经过2007年4月、7月、9月、11月4个不同时期的测定,研究表明：同一植被类型下（除灌木林地）土壤含水量9月的最大,与当地的雨季呈现同增同减的关系,而灌木林地下土壤含水量呈现4—11月持续增加的变化。在同一月份中,不同植被下的土壤含水状况为：次生林地〉杨柳混交林地〉灌木林地〉针阔混交林地〉刺槐林地〉陡荒地〉平荒地〉岷江柏林地的变化关系,但是在9月和11月中,灌木林地下的土壤含水量却又远远高于其他植被下的土壤含水量。

Through analyzing the physical properties of soil,drying method and cutting ring method were used to determine,emphasising to know the change of 0～40 cm soil water content of different vegetation types in dry-hot valley and mountain forest in upper reaches of the Minjiang River.Through determining soil water constent in April,July,September and November,the results showed that the soil water content got maximum value in September under the same vegetation type except the shrub land,and appeared positive correlation with rainy season in this area,under the shrub land it constantly increased from April to November in 2007.In the same month,the status of soil water contents under different vegetation types were：secondary forestpopulus mixed with salixshrub landneedle-broad mixed forestblack locust foreststeep waste landflat waste landCupressus chengiana forest,but in September and November,the soil water contents under the shrub land were more than that under the other vegetation types.