Vertical distribution of soil moisture in typical plantation in the loess region of western Shanxi Province
[Objective]This study,with an investigation of the dynamic characteristics of 0-500 cm soil moisture in the restoration process of artificial forests in the loess region of western Shanxi Province,is aimed to provide theoretical basis for improving soil water environment of plantation and realizing forest water balance.[Method]First,with five typical plantations(Robinia pseudoacacia,Platycladus orientalis,Pinus tabuliformis,R.pseudoacacia-Platycladus orientalis,R.pseudoacacia-Pinus tabuliformis)selected as the research objects,oil drill drying method was employed to measure the soil moisture content of 0-500 cm before an anlysis was conducted of the vertical distribution and dynamic change characteristics of soil moisture in artificial forests.[Result]The average soil water content of plantations from large to small is Platycladus orientalis＞R.pseudoacacia-Platycladus orientalis＞Pinus tabuliformis＞R.pseudoacacia-Pinus tabuliformis＞R.pseudoacacia,showing a significant difference in the soil content and that precipitation and soil texture were the main factors affecting soil water content in plantations(P＜0.05).Vertically,the variation degree of soil water content was moderate,and the variation coefficient decreased with the increase of soil depth with the variation of soil water content of each plantation becoming steady at a depth of about 360 cm whereas the artificial vegetation mainly affected the soil water in the range of 0-360 cm with the water variation of R.pseudoacacia forest being the highest,and that of Platycladus orientalis forest being the most stable.The vertical layers of soil water in the plantation were divided into exchange layer,use layer,regulation layer and stability layer by using the ordered clustering method with some differences in the depth of the layers among different stands.[Conclusion]The artificial forest land can reduce soil moisture to some extent in the study area and the consumption of deep soil water increases with the occurrence of drought in R.pseudoacacia,Pinus tabuliformis,R.pseudoacacia-Pinus tabuliformis,especially R.pseudoacacia forest.Therefore,it is suggested that during the construction of forestry ecological engineering,efforts should be made to reduce the planting of R.pseudoacacia forest and increase the planting of Platycladus orientalis in an appropriate manner,as well as transform the existing R.pseudoacacia forest with poor soil water status into a mixed forest,so as to improve the soil water environment and achieve forest water balance.[Ch,5 fig.2 tab.28 ref.]
soil moisture contentplantationvertical variation characteristicsmixed forestloess region of western Shanxi Province
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