Soil water depletion depth by planted vegetation on the Loess Plateau |
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Authors: | ZhiQiang Wang BaoYuan Liu Gang Liu YongXuan Zhang |
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Institution: | (1) State Key Laboratory of Earth Surface Processes and Resource Ecology, School of Geography, Beijing Normal University, Beijing, 100875, China |
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Abstract: | Evapotranspiration of much planted vegetation exceeds precipitation, and this can deplete soil water and cause a deep dry
layer in the soil profile, which is a serious obstacle to sustainable land use on the Loess Plateau, China. This study aimed
to determine water depletion depth of planted grassland, shrub, and forest in a semiarid area on the Loess Plateau. Soil moisture
of five vegetation types was measured to >20 m in depth. The vegetation types were crop, natural grasse, seven-year-old planted
alfalfa (Medicago sativa L.), 23-year-old planted caragana (Caragana microphylla Lam.) shrub, and 23-year-old planted pine (Pinus tabulaeformis L) forest land. Through comparing moisture of planted alfalfa grass, caragana shrub, and pine forest to crop and natural
grassland, the depth and amount of soil water consumed by grassland, caragana brush and pine forest was determined. The depth
of soil water depleted by alfalfa, caragana brush, and pine forest reached 15.5, 22.4 and 21.5 m, respectively.
Supported by National Basic Research Program of China (Grant No. 2007CB407204) and National Natural Science Foundation of
China (Grant No. 40471082) |
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Keywords: | Loess Plateau planted alfalfa grass planted caragana shrub planted pine forest soil moisture dry soil layer |
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