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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国家科技期刊平台
NETL
NSTL
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中文摘要：[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，通过水槽冲刷试验，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含量呈显著负相关(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含量大于顺层坡。(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。77，0。85，能有效预测土壤分离能力。[结论]草地土壤分离能力在顺/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。

外文标题：Effect of Rock Strata Dip on Soil Detachment Capacity of Different Land Use Types in Karst Trough Valley Area

外文摘要：[Objective]This study aimed to explore the influence mechanism of rock strata dip on soil erodibility and provide references for preventing and controlling water and soil erosion in karst trough valley area.[Methods]The study focused on the dip/anti-dip slope of Qingmuguan karst trough valley area in Chongqing city.Through flume erosion experiments,we analyzed the differences in soil erodibility between different land use types on the dip/anti-dip slopes and investigated the impact of soil physicochemical properties on soil erodibility.[Results](1)Both dip/anti-dip slopes showed a significant negative correlation with organic matter content,＞0.25 mm water-stable aggregates content,and total nitrogen content(p＜0.05).In particular,the anti-dip slope had higher organic matter content,＞0.25 mm water-stable aggregate content,and total nitrogen compared to the dip slope.(2)Soil erodibility was higher on the dip slope than on the anti-dip slope for all four land use types studied.Additionally,grassland had lower comprehensive scores of soil erodibility than pepper fields,cornfields,and bare land on both the dip/anti-dip slopes.(3)Based on stepwise multiple regression analysis results,prediction models for soil erodibility on the dip/anti-dip slopes were established using organic matter content and＞0.25 mm water-stable aggregate content as predictors with determination coefficients R2 of 0.77 and 0.85 respectively.[Conclusion]In summary,grassland had the lowest soil erodibility among all land use types studied regardless of the 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.

外文关键词：

soil detachmentsoil physicochemical propertiesrock strata dipland use typekarst trough valley area

作者：

蒋莉沙、甘凤玲、谭晓红、石海龙、赵烜、蒲俊兵

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作者单位：

重庆师范大学三峡库区地表过程与生态修复重庆市重点实验室,重庆,401331

重庆师范大学地理与旅游学院山区生态系统碳循环与碳调控重庆市重点实室,重庆 401331

关键词：

土壤分离土壤理化性质岩层倾向土地利用类型喀斯特槽谷区

基金：

国家自然科学基金项目国家重点研发计划政府间国际科技创新合作重点专项中国博士后基金项目重庆市科委科学研究项目重庆市教委科技项目重庆市教委科技项目重庆市自然科学基金联合基金项目

项目编号：

421073552021YFE01071002023MD744195CSTB2022NSCQ-MSX1053KJQN202100518KJQN202100542CSTB2022NSCQ-LZX00223

出版年：

2024

DOI：

10.13870/j.cnki.stbcxb.2024.03.034

水土保持学报

中国土壤学会　中国科学院水利部水土保持研究所

水土保持学报

CSTPCD北大核心

影响因子：1.226

ISSN：1009-2242

年,卷(期)：2024.38(3)