四川宽坝林区土壤水分动态研究

Dynamic Comparison of Soil Water in Forest Land in Kuanba

采用定位观测方法,利用2005年全年观测数据,从土壤水分对宽坝林地内的典型森林集水区(常绿阔叶林、杂灌林以及荒草坡)的森林水文月动态变化规律进行了研究,结果表明:(1)常绿阔叶林土壤含水月平均最大值为41.51%,最小值为33.77%;杂灌林土壤含水月平均最大值为39.17%,最小值为36.85%;荒草坡土壤含水月平均最大值为40.64%,最小值为37.47%。(2)土壤水分的垂直变化幅度不大,且各层土壤水分月动态变化趋势基本一致。(3)与杂灌林和荒草坡相比,天然常绿阔叶林具有较强水土保持能力和显著水源涵养作用。

In this paper, based on the position fixing observation method and the collected observation data in the year 2005, resrarches are directed to the monthly dynamic changes of the hydrology of natural evergreen broad-leaved forest and brushwood and barren are as follows ： （ 1 ） The average monthly maximum of soil grassland in Kuanba district. The research results moisture of natural evergreen broad-leaved forest is 41.51%, and the minimum is 33.77% ; The average monthly maximum of soil moisture of brushwood is 39.17%, and the minimum is 36.85% ; The average monthly maximum of soil moisture of barren grassland is 40.64%, and the minimum is 37.47% ; （2）The vertical distribution change of moisture in the depth of soil is not obvious and monthly dynamic changes of the soll moisture basically are the same in each layer; （3）Compared with brushwood and barren grassland, natural evergreen broad-leaved forests have a good water and soil conservancy and a good effect of headwaters conservation.