块石出露对喀斯特坡耕地土壤理化性质的影响
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陈磊(1994-),男,博士研究生,主要从事土壤侵蚀与水土保持研究。E-mail:202031051014@mail.bnu.edu.cn

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国家自然科学基金重点项目(41730748)


Effect of Rock Outcropping on Soil Physicochemical Properties on Karst Sloping Cropland
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    摘要:

    喀斯特坡面伴随有大量直径>25 cm的块石出露,为探明块石出露对土壤理化性质的影响,以坡面4个块石出露的农地和1个对照组为研究对象,分析土壤理化性质空间变异特征。结果表明:(1)在块石出露的农地中,土壤容重、黏粒、粉粒和砂粒的变化分别为0.87~1.42 g/cm3,25.70%~41.80%,38.11%~51.60%,13.76%~27.54%,土壤容重、黏粒和粉粒空间变异性均为弱且高于对照组,砂粒空间变异性为中等且低于对照组。(2)土壤全碳、全氮、全磷、全钾变化分别为9.82~23.13,0.94~2.15,0.65~2.93,7.38~20.35 g/kg,土壤有效磷、速效钾的变化分别为1.44~2.63,7.35~106.02 mg/kg,空间变异性均为中等且高于对照组。(3)土壤容重、黏粒、粉粒与其他土壤理化性质的之间的关系总体上呈负相关,且相关性在块石出露的农地中比对照组更显著。砂粒与黏粒之间呈显著负相关,与其他土壤化学性质之间的关系总体上呈正相关。(4)块石出露数量、出露坡度、出露比率和出露高度,对土壤理化性质的影响具有复杂性,土壤理化性质的空间变异随块石出露特征不同而存在差异性。研究结果有助于深入理解喀斯特坡面块石出露对侵蚀过程和机制的影响,为土壤侵蚀和水土保持工作提供科学借鉴。

    Abstract:

    In order to investigate the effect of rock outcrops on soil physicochemical properties, four rock outcrops and one control group were used to analyse the spatial variability of soil physicochemical properties. The results showed that: (1) In the sloping cropland with rock outcropping, the variation range of soil bulk density, clay, silt, and sand was 0.87~1.42 g/cm3, 25.70%~41.80%, 38.11%~51.60% and 13.76%~27.54%, respectively. The spatial variation of soil bulk density, clay and silt was weak and higher spatial variability than that of the control. The spatial variability of sand grains was moderate and lower than that of the control. (2) The spatial variability of soil total carbon, total nitrogen, total phosphorus and total potassium ranged from 9.82 to 23.13, 0.94 to 2.15, 0.65 to 2.93 and 7.38 to 20.35 g/kg, respectively, while the spatial variability of soil effective phosphorus and fast-acting potassium ranged from 1.44 to 2.63 and 7.35 to 106.02 mg/kg, respectively, all with medium and higher spatial variability than the control group. (3) Soil bulk density, clay and silt were negatively correlated with other soil physicochemical properties, and the correlation was more significant in the sloping cropland with rock outcropping than that of the control group. There was a significant negative correlation between sand and clay, and a positive correlation between sand and other soil chemical properties. (4) The number, gradient, ratio, and height of rock outcropping had a complex impact on soil physical and chemical properties. The spatial variation of soil physicochemical properties varied with the characteristics of different rock outcropping. The research results contribute to a deeper understanding of the impact of rock outcropping on the erosion process and mechanism on karst slope, and provide scientific reference for soil erosion and soil conservation work.

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陈磊, 张卓栋, 李业桐.块石出露对喀斯特坡耕地土壤理化性质的影响[J].水土保持学报,2023,37(6):228~237

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  • 收稿日期:2023-05-27
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  • 在线发布日期: 2023-12-27
  • 出版日期: 2023-12-28