Soil Hydraulic Characteristics of Different Forest Types in a Longji Terraced Field in Guangxi Region
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S714.5

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    Abstract:

    [Objective] Variation of soil hydraulic characteristics under different forest types were studied to provide a scientific basis for regional ecological landscape construction and selection of water resource conservation forests.[Methods] Different forest types (bamboo forest, chinese fir forest, mixed forest) and terraced fields were selected as the research objects at a Longji terraced field in Guangxi Zhuang Autonomous Reion. The main soil properties were measured in different soil layers (10, 20, 40, 60 cm) to sduty soil hydraulic characteristics and their influencing factors.[Results] ① The soil texture of Longji terraces was silty loam. The clay content of the soil had significant differences, but the silt and sand content had no significant differences in different layers. ② Soil bulk density differences in different layers of chinese fir forest and mixed forest were not significant, but the soil bulk density in the lower layer of bamboo forest and terraced field was significantly higher than that in the upper layer. The soil capillary porosity, total porosity, and field water holding capacity followed the order of mixed forest >chinese fir forest > bamboo forest > terraces. ③ The soil permeability of bamboo forest was the greatest, followed by chinese fir forest and mixed forest, and was lowest in the terraced fields. ④ Under the same soil suction, the volumetric soil moisture content of mixed forest and chinese fir forest were similar, and the soil water holding capacity was greater than that of bamboo forest and terraced field. Soil bulk density and porosity (capillary porosity and total porosity) were the main factors influencing soil permeability and water holding capacity. The saturated water conductivity had a significant negative correlation with soil bulk density and a significant positive correlation with porosity. The soil water characteristic curve fitting parameter θs was significantly negatively and positively correlated with soil bulk density and porosity (capillary porosity and total porosity), respectively, and α was significantly positively correlated with soil porosity.[Conclusion] Bamboo forest had the greatest soil permeability, but the lowest soil water-holding capacity. Both chinese fir forest and mixed forest had large soil water-holding capacity, and can be instrumental in promoting good water conservation.

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王醒,方荣杰,张帅普,黄卉,黄朗,吴忠军.广西龙脊梯田区森林类型对土壤水力特性的影响[J].水土保持通报英文版,2021,41(5):92-98,106

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History
  • Received:April 16,2021
  • Revised:June 07,2021
  • Online: October 25,2021