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| DOI：10.13522/j.cnki.ggps.2019418 |
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| Evaluating Bioavailable Soil Water during Vegetation Restoration in the Loess Plateau |
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ZHANG Yongwang, WANG Jun, QU Yatan, LIU Shipeng, WANG Yan, SHANGGUAN Zhouping
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1.College of Life Sciences, Yan’an University, Yan’an 716000, China; 2. Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China
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| Abstract: |
| 【Objective】Vegetation restoration alerts soil water dynamics due to the changes in soil structure and evapotranspiration. The relationship between soil structural change and its ability to hold water can be described by the soil water characteristic curve. The objective of this paper is to investigate the variation in soil water characteristic curve and bioavailability of soil water under different land coverages: grassland, shrub land and forestland.【Method】Intact soil samples were taken from the field under the three vegetation coverages in Ziwuling forest region at the center of the Loess Plateau. The water characteristic curves of all samples were measured, and the bioavailable water in each soil was calculated from these curves.【Result】Both water holding capacity and bioavailable water of the soil increased in the order of grassland < shrub land < forestland during the vegetation restoration process, in which soil particle composition, soil bulk density and porosity play an important role.【Conclusion】Results of this study could provide guidance for planning land use change and vegetation restoration. |
| Key words: vegetation types; soil water characteristic curve; the loess plateau; soil water holding capacity; soil water availability |
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