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R^(2)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。
[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 R 2 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.
作者
蒋莉沙
甘凤玲
谭晓红
石海龙
赵烜
蒲俊兵
JIANG Lisha;GAN Fengling;TAN Xiaohong;SHI Hailong;ZHAO Xuan;PU Junbing(Chongqing Key Laboratory of Surface Process and Ecological Resroration in the Three Gorges Restoration Area,Chongqing Normal University,Chongqing 401331;Chongqing Key Laboratory of Carbon Cycle and Carbon Regulationof Mountain Ecosystem,College of Geography and Tourism Science,Chongqing Normal University,Chongqing 401331,China)
出处
《水土保持学报》
CSCD
北大核心
2024年第3期130-139,共10页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(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)
中国博士后基金项目(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项目(CSTB2022NSCQ-LZX00223)。
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
soil detachment
soil physicochemical properties
rock strata dip
land use type
karst trough valley area
