Evaluation of Soil Desiccation Intensity in Different Ages of Caragana korshinskii Kom.in Loess Hilly Region, Northwestern Shanxi
It was of great significance to carry out a study on the evaluation of soil desiccation intensity for vegetation restoration in water-limited hilly areas of the Loess Plateau.In this paper,soil moisture dynamics in profile with depth of 600 cm was measured under three different ages of Caragana shrub sites and the uncultivated land at Zhangjiaping forestry station of Wuzhai County in the growing season (from April to October) in 2013.By analyzing,there were different levels of soil water deficits and soil desiccation in each sample plot,and the main findings were as follows:(1) As for the rainfall infiltration function,most of the soil layers showed the surplus state except for few soil layers,and the overall water storage in different ages of Caragana shrubs decreased in the order:20-year Caragana＞ 10-year Caragana ＞ 35-year Caragana ＞ the uncultivated land.(2) In general,soil desiccation level reached to the mild or moderate desiccation intensity at each sampling site,and the average thickness of desiccated soil layer was approximately 447 cm.Both of the dried soil density,total thickness of the desiccated soil layer and the initial formation depth of soil dry layers gradually increased with the growth age of forest.(3) With respect to all kinds of precipitation years,the time needed for water restoration in desiccated soil layers increased with the increase of forest ages.Meanwhile,the difficulty coefficient for soil moisture restoration gradually experienced the increasing trend as well.
soil water contentdesiccated soil layerCaragana korshinskii Kom.soil desiccationThe Loess Hilly Region
国家科技期刊平台
NSTL
万方数据
维普
