The Soil Moisture Content Restoration And Consumption Of The Artificial Forest And Farmland In Xi'an Area After A Rainy Year

The loess plateau is situated at half arid area, where the rainfall is little and concentrates, and the underground water buried depth is deep, which cause the soil moisture to be especially important in vegetation construction of the loess plateau. Surface evaporating and plant's transpiration cause the soil moisture to be serious lost, and the dry layer has appeared in soil under some vegetation, especially under the artificial forest and grass vegetation displayed outstandingly. The dry layer not only influences the vegetation's growth and renewal, but also threatens the following vegetation's construction. Therefore, the research into the soil moisture change has an important practical significance to promote artificial forest's normal growth, the forestry development and the ecological environment construction, as well as reduce the environmental disaster which possibly creates to in the loess plateau.Through the soil moisture content determination from zero to six meter of different artificial forest land and farmland in northern suburb, southern suburb and eastern suburb of Xi'an area, this article has studied the soil moisture restoration condition and consumption process of the artificial forest land and farmland in this local after a rainy year, as well as change rule of the soil moisture and influence factors and so on. The light manpower drill is used to gather sample, and the depth of drill hole is six meter, the sampling spacing is ten ceilometers, generally sixty samples are gathered each hole. The determination of soil moisture content adapted drying weight method which has been considered accurate and reliable. The places of Xi'an area were elected to be studied including Tuan village in Gaoling County of the northern suburb, Wujiafen and Chang'an area of the southern suburb, as well as Shaopingdian village in Ba bridge area of eastern suburb and so on. Kinds of the artificial forest trees were chosen including the pear tree, the apricot tree, the Chinese parasol, the French parasol, the poplar, the cedar, the Chinese scholar tree, the white wax woods and the oriental arbor-vitae and so on. In addition, for the contrast, some determinations to the soil moisture content of weed places have also carried on.The annual precipitation of 2003 was 883 mm, which is higher than the normal...