河流故道区土壤水分动态变化规律初探

以河流故道区土壤为主要研究对象,对该区内土壤剖面及地下水深进行了分组测试、分析,发现试验区内土体沙粘排列多变,1m到2m土体内,多数存在厚度5～20cm不等的粘土层,2m以下土层中有土壤水分逐年减少的趋势。并对7年生梨树地土壤水分动态变化规律及2m土体有效水储量进行了研究,结果表明:生育期内,0～80cm土体水份含量季节性变化剧烈,且有不规律的土壤供水不足现象,80cm以下土壤水分含量变化趋于平缓。

A study on the dynamic regularity of the variation in soil moisture in ancient watercourses

This is a study targeted mainly at the analysis of the soil in ancient watercourses. The soil profile has been studied and the depth of groundwater measured in sample groups. The result shows a variety of change in the sand-clay layers of the area under test. A wide variety of clay layers ranging from 5 to 20 cm have been found in most of the sample sites within the depth of 1 to 2 m. A gradual annual decrease of soil moisture is observed below the 2-meter depth. An additional study has also been done in the soil of a pear orchard of 7-year growth for the dynamic regularity of the change in soil moisture and a test of effective water reserve in the regolith has been done within the 2-meter depth. The result shows a striking seasonal variation in the soil moisture of the regolith ranging from 0 to 80 cm within the growth period. An irregular insufficient water supply in the soil has also been observed at the site but the variation of soil moisture remains constant below the 80 cm regolith.