东北黑土区土壤侵蚀阻力对土地利用类型的响应与影响因素
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北京师范大学地理科学学部

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S157

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Soil resistance and its influencing factors under different land use types in the black soil region of Northeast China
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Faculty of Geographical Science,Beijing Normal University

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    摘要:

    [目的]土壤侵蚀阻力反映了土壤抵抗侵蚀的性能,包括细沟可蚀性(Kr)和土壤临界剪切力(τc)。通过水槽冲刷试验探究不同土地利用类型下土壤侵蚀阻力差异及其主控因素,为揭示东北黑土区土壤侵蚀动力机制提供理论基础。[方法]在黑龙江省嫩江市鹤山农场鹤北小流域选取7种典型的土地利用类型,利用水槽冲刷试验测定了土壤分离能力,拟合了Kr和τc,采用相关分析和偏最小二乘回归方法,确定了影响土壤侵蚀阻力的主要因素。[结果](1)土地利用类型显著影响土壤侵蚀阻力,不同土地利用类型样地Kr变化在0.003-0.372 s/m之间,道路Kr最高,与农地相比,草地、横向林带、林地、纵向林带和灌木的Kr分别降低94%、86.2%、84%、83.6%和71.6%;τc在4.84-13.85 Pa之间变化,农地和道路的τc偏低,分别为4.84和9.80 Pa,其他样地τc均大于10 Pa,且相互差异不显著。(2)相关分析结果表明,Kr与黏粒含量、团聚体稳定性和有机质含量呈极显著负相关关系(P < 0.01),与砂粒含量、粘结力、根系质量密度和混入表土层的枯落物密度呈显著负相关关系(P < 0.05),与粉粒含量呈极显著正相关关系(P < 0.01);τc与粉粒含量呈极显著负相关关系(P < 0.01),与砂粒含量和混入表土层的枯落物密度呈极显著正相关关系(P < 0.01),与有机质含量和根系质量密度显著正相关(P < 0.05)。(3)偏最小二乘回归结果显示,Kr主要受土壤黏粒含量、粉粒含量、团聚体稳定性、根系质量密度、有机质含量和混入表土层的枯落物密度影响,而τc主要受土壤有机质含量、混入表土层的枯落物密度、粉粒含量和根系质量密度影响。[结论]土地利用类型显著影响土壤侵蚀阻力,土壤理化性质和植被特性是土壤侵蚀阻力的重要影响因素。研究结果为揭示土地利用类型影响土壤侵蚀动力机制以及土地利用优化提供了理论基础。

    Abstract:

    [Objective]Soil resistance reflects the characteristics of soil to mitigate erosion and is quantified by rill erodibility (Kr) and critical shear stress (τc). To investigate the difference of soil resistance and its main controlling factors under different land use types through the flume scouring test, which provided a theoretical basis for revealing the dynamic mechanism of soil erosion in Northeast black soil area. [Methods]Seven typical land use types were selected in the Hebei small watershed of Heshan Farm, located in Nenjiang city of Heilongjiang Province. Kr and τc were determined using the measured soil detachment capacity by scouring test in a large hydraulic flume. The dominant factors influencing soil resistance were determined by correlation analysis and partial least square regression. [Results](1)Soil resistance was significantly affected by land use type. The estimated Kr varied from 0.003 to 0.372 s/m among different land use types. Kr of road was the highest. Compared to cropland, Kr of grassland, transverse forest belt, woodland, longitudinal forest belt, and shrub land decreased by 94%, 86.2%, 84%, 83.6%, and 71.6%. The fitted τc ranged from 4.84 and 13.85 Pa. Cropland and road had lowest τc (4.84 and 9.80 Pa). The differences in τc were not significant between other land use types and were greater than 10 Pa. (2) Correlation analysis showed that Kr was significantly correlated with clay content, aggregate stability and organic matter content (p<0.01), and sand content, soil cohesion, root mass density and litter density mixed within topsoil layer (p<0.05) negatively. It was significantly correlated with silt content (p<0.01) positively. τc was significantly related to silt content (p<0.01) negatively. It was significantly correlation with sand content and topsoil litter density (p<0.01), and organic matter content and root mass density (p<0.05) positively. (3) The results of PLSR analysis demonstrated that the dominant factors influencing Kr were soil clay content, silt content, aggregate stability, root mass density, organic matter content and litter density mixed within topsoil layer. The key factors affecting τc were soil organic matter content, litter density mixed within topsoil layer, silt content and root mass density. [Conclusion] Land use type significantly affects soil resistance, and soil physicochemical properties and vegetation characteristics are important influences on soil resistance. The results of the study provide a theoretical basis for understanding the mechanism of land use type impacting soil erosion dynamics and land use optimization in the black soil area.

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  • 收稿日期:2024-02-23
  • 最后修改日期:2024-03-25
  • 录用日期:2024-04-15
  • 在线发布日期: 2024-07-18
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