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论文题目 Soil moisture status under deep-rooted and shallow-rooted vegetation in the semiarid area of loess plateau in China
作  者 Xuyan Wang(王旭艳), Wanjun Zhang(张万军), Zhiqiang Wang, Xiuping Liu (刘秀萍), Shufen Wang;
发表年度 2014
刊物名称 Pol.J. Environ. Stud.
卷、期、页码 23; (2); 511-520
影响因子
论文摘要

Deep loessial soil stores water recharged in rainy season or wet year, and supply water to vegetation for evapotranspiration in dry season or dry year in the semiarid area of the Loess Plateau, China. However this function of “soil water reservoir” may be weakened by deep rooted shrub and forest which often extract deep soil water and form dry soil layer. The purpose of this study was to evaluate soil moisture status and variation under deep and shallow rooted vegetations. The hypothesis was that the mature deep rooted vegetations in this area may deplete deep soil water to such extent that the plants could not further extract water from deep soil layer, and the plants live mainly on present year precipitation. Soil moistures of shallow rooted annual crop and natural grasses, planted deep rooted caragana shrub, arborvitae forest, pine forest and the mixture forest of pine and arborvitae were tested in the late year of 2001, 2005-2008 to 10 m depth. The maximum rain water recharge depths under shallow rooted vegetations were 2.4-3.0 m, and those under deep rooted vegetations were 1.2- 2.2m in a relatively wet year in the five years. Within the maximum recharge depths, annual recharge depths and soil moistures were changed inter-annually dependent on rainfall. The average recharge depths of deep rooted vegetations were 0.6, 1.0, 1.2, 1.4, and 1.8m in the year of 2005, 2008, 2006, 2007, and 2001, according to the ascending Jun.—Oct. rainfall amount order. In the inter-annually rechargeable layer, soil moistures under shallow rooted vegetations were 6.7—13.6 % in the five years, belonged to easily or most easily available level in four out the five study years, the moistures under deep rooted vegetations were 4.5—12.0%, varied from hard—unavailable to easily available moisture level dependent on rainfall. Below the inter-annually changeable layer to the tested 10 m, there were no significant inter-annual moisture changes (p<0.001) under both shallow rooted and deep rooted vegetations, but the moistures of shallow rooted vegetations were >10 %, belonged to easily available moisture level, those of deep rooted vegetations were <5 %, close to permanent wilting point, and the water belonged to or near to hard—unavailable moisture level.

 

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