岩层倾向对喀斯特槽谷区不同土地利用类型土壤分离能力的影响
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重庆师范大学

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(42107355);国家重点研发计划政府间国际科技创新合作重点专项(2021YFE0107100);中国博士后(2023MD744195);重庆市科委科学研究项目(CSTB2022NSCQ-MSX1053);重庆市教委科技项目(KJQN202100518,KJQN202100542);重庆市自然科学基金联合基金(CSTB2022NSCQ-LZX00223)


Effect of Rock Strata Dip on Soil Detachment Capacity of Different Land Use Types in karst Trough Valley Area
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Chongqing Normal University

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    摘要:

    摘要:[目的]探索岩层倾向对喀斯特槽谷区土壤分离能力的影响机制,为喀斯特槽谷区预防和治理水土流失提供参考意见,[方法]以重庆市青木关岩溶槽谷区顺/逆层坡为研究对象,通过水槽冲刷实验,分析不同土地利用类型在顺/逆层坡的土壤分离能力差异,并探讨土壤理化性质对土壤分离能力的影响。[结果] (1)顺/逆层坡土壤分离能力均与土壤有机质含量、>0.25 mm水稳性团聚体含量和全氮呈显著负相关关系(P<0.05),其中,逆层坡有机质含量、>0.25 mm水稳性团聚体含量和全氮大于顺层坡。(2)4种土地利用方式下的土壤分离能力均为顺层坡高于逆层坡。此外,草地的土壤分离能力综合得分在顺/逆层坡均低于辣椒地、玉米地和裸地。 (3)根据多元逐步回归分析结果,基于有机质含量和>0.25 mm水稳性团聚体含量建立的顺/逆层坡土壤分离能力预测模型的决定系数R2分别为0.77和0.85,能有效预测土壤分离能力。[结论]综上所述,草地的土壤分离能力在顺/逆层坡均为最小。因此,为预防喀斯特槽谷区水土流失以及促进生态恢复,应合理进行耕种,并且适当增加草地的覆盖面积,提高土壤抗侵蚀能力。

    Abstract:

    Abstract: [Objective] This study aims to explore the influence mechanism of rock strata dip on soil erodibility in karst gorge areas, and provide reference for preventing and controlling water and soil erosion in karst trough valley area. [Methods] The study focuses on the dip/anti-dip slope of Qingmuguan karst trough valley area in Chongqing City. Through flume erosion experiments, we analyze the differences in soil erodibility between different land use types on dip/anti-dip slopes, and investigate the impact of soil physicochemical properties on soil erodibility.[Results] (1) Both dip/anti-dip slopes shows a significant negative correlation with organic matter content, >0.25 mm water-stable aggregates content, and total nitrogen content (P<0.05). In particular, anti-dip slope have higher organic matter content, >0.25 mm water-stable aggregates content, and total nitrogen compared to dip slope. (2) Soil erodibility is higher on dip slope than anti-dip slope for all four land use types studied. Additionally, grassland has lower comprehensive scores of soil erodibility than pepper fields, cornfields, and bare land on both dip/anti-dip slopes. (3) Based on stepwise multiple regression analysis results, prediction models for soil erodibility on dip/anti-dip slopes were established using organic matter content and >0.25 mm water-stable aggregates content as predictors with determination coefficients R2 of 0.77 and 0.85 respectively.[Conclusion] In summary, grassland has the lowest soil erodibility among all land use types studied regardless of dip/anti-dip slopes in karst trough valley. Therefore, in order to prevent soil erosion and promote ecological restoration in karst trough valley, it is necessary to cultivate the land reasonably and increase grassland coverage appropriately, thus enhancing the soil''s resistance against erosion.

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  • 收稿日期:2023-12-08
  • 最后修改日期:2024-01-10
  • 录用日期:2024-01-11
  • 在线发布日期: 2024-04-29
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