Water-holding Capacity of Reclaimed Grassland with Different Ages in Karst Regions
Journal Title: Bulletin of Soil and Water Conservation - Year 2023, Vol 43, Issue 5
Abstract
[Objective] The water-holding capacity of reclaimed grassland of different ages was studied in order to provide a scientific basis for water retention and soil and water conservation of reclaimed grassland in karst regions. [Methods] Reclaimed grassland of different ages (5, 10, 15, 20 yr) and cultivated land (CK) in a karst area in Anshui City, Guizhou Province was selected as the research objects, and the “space-time substitution method” was used to study litter storage, water-holding capacity, and water storage capacity. The change characteristics of soil profile bulk density, porosity, particle composition, water content, and water-holding capacity were determined for different ages of reclaimed grassland. [Results] ① The litter-layer storage capacity, maximum water-holding capacity, maximum storage capacity, and effective storage capacity followed the reclaimed grassland age order of 15 yr>20 yr>10 yr>5 yr. The relationships of litter-layer water-holding capacity and water absorption rate with soaking time were characterized by a logarithmic function and a power function, respectively. ② The sand content and bulk density of the reclaimed grassland showed a trend of first decreasing and then increasing as age of reclaimed grassland increased. Changes in silt, clay, total porosity, capillary porosity, maximum water-holding capacity, and capillary water-holding capacity were opposite to the changes in soil bulk density. ③ The total water-holding capacity of the litter layer and the soil layer followed the order of 10 yr>20 yr>15 yr>5 yr>CK. The maximum water-holding contribution rate of the soil layer was more than 99%. [Conclusion] Reclaimed grassland of different ages not only increased the bioaccumulation, rainfall interception, and water-holding capacity of the litter layer, but also improved soil structure and pore status. The soil water-holding capacity gradually stabilized after 10 years. Therefore, it is recommended that planting deciduous trees after 10 years of farmland conversion to grassland.
Authors and Affiliations
Xiulong Luo, Yingge Shu, Hui Long, Xuemei Li
Keywords
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- EP ID EP762682
- DOI 10.13961/j.cnki.stbctb.2023.05.002
- Views 17
- Downloads 0
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