干旱区地理2013，Vol.36Issue(1)：92-100,9.
用隔绝法对极干旱区土壤水分来源的分析
Applying isolation method on study of soil water source in an extremely dry area
摘要
Abstract
Usually considered that in extremely arid area the soil moisture comes from rainfall, atmosphere or condensed water, deep phreatic water evaporation does not exist. But the greenhouse method test shows that there exists phreatic water evaporation, and phreatic water is an important source of soil moisture in the extremely arid area. To further verify sources of soil water, two soil pits, were excavated with a scale of 200 cm×200 cm×200 cm, one pit' s connections were completely cutout with its bottom soil and surrounding soil(called as isolated pit), another pit' s connections was cutout with its surrounding soil, but was kept in with bottom soil(called as connected pit), two sets of HOBO-U23-1000 instrument were inserted into the two pits' backfilling soil to monitor their temperature and humidity at the depths of 10, 30, 50 and 100 cm. After 27d, a 25mm rainfall simulation test was carried out for the two backfilled pits. Before the rainfall simulation test mentioned above, the connected pit' s soil relative humidity, absolute humidity, soil water content are significantly higher than that of the isolated pit. After a year during which the rainfall was without for long time, the test results found that the soil water content of the connected pit was higher than that of the isolated pit; however, under the condition of same meteorological environment, because the phreatic water evaporation spills over, the isolated pit' s soil humidity does not infinitely dropped down. The comparison experiment proves inversely that the deeply buried phreatic water' s evaporation exists in the extremely arid area' s. Deeply buried soil.关键词
隔绝/极干旱地区/土壤水分/潜水/降水Key words
isolation/ the extremely arid areas/ soil moisture/ phreatic water/ precipitation分类
农业科技引用本文复制引用
李红寿,汪万福,柳本立,詹鸿涛,邱飞..用隔绝法对极干旱区土壤水分来源的分析[J].干旱区地理,2013,36(1):92-100,9.基金项目
国家自然基金项目(40940005 （）
31070344 （）
31260136)和敦煌研究院课题(201306)共同资助 （201306）
