基于加热实验的凉山干旱河谷土壤斥水性研究  

Soil Water Repellency in Dry River Valleys of LiangshanBased on Lab-heating Experiment

作　　者：张军[1,2,3] 贾春蓉 吕威[1,2,3] 张泽洪 曹鋆杰[1] 黄瑜馨 余秋莲 ZHANG Jun;JIA Chun-rong;LYU Wei;ZHANG Ze-hong;CAO Yun-jiea;HUANG Yu-xina;YU Qiu-liana(School of Geographical Sciences,China West Normal University,Nanchong Sichuan 637009,China;Sichuan Provincial Engineering Laboratory of Monitoring and Control for Soil Erosion on Dry Valleys,China West Normal University,Nanchong Sichuan 637009,China;Liangshan Soil Erosion and Ecological Restoration in Dry Valleys Observation and Research Station,Xide Sichuan 616753,China)

机构地区：[1]西华师范大学地理科学学院,四川南充637009 [2]西华师范大学四川省干旱河谷土壤侵蚀监测与控制工程实验室,四川南充637009 [3]大小凉山干旱河谷土壤侵蚀与生态修复野外科学观测研究站,四川喜德616753

出　　处：《西华师范大学学报（自然科学版）》2023年第5期514-518,共5页Journal of China West Normal University(Natural Sciences)

基　　金：西华师范大学英才基金项目(17YC108);西华师范大学博士启动项目(17E034)。

摘　　要：森林火灾影响地表覆被和土壤性质,改变土壤斥水性,而土壤斥水性被认为是影响土壤水文和侵蚀过程的直接原因。本文采集四川省凉山干旱河谷区表层原状森林土样,通过加热实验,分析不同温度和时间土壤斥水性的变化特征。结果显示:未加热情况下,土壤斥水性具有较强的空间异质性,随着加热温度升高和时间延长,空间异质性减弱。土壤斥水性随温度升高而降低,300℃后土壤斥水性被破坏。土壤斥水性随加热时间延长而降低,前30 min最为明显,60 min后基本保持稳定,但温度达到300℃后,加热时间对表层土壤斥水性的影响减弱。Soil water repellency(SWR)is altered when forest fires affect surface cover and soil properties,which is considered to be the direct cause of affecting soil hydrology and erosion process.This paper employs lab-heating experiment to analyze the variation characteristics of SWR at different emperature and time in the undisturbed forest soil samples collected from dry river valleys of Liangshan Yi Autonomous Prefecture in Sichuan province.The results indicate that SWR has strong spatial heterogeneity under unheated conditions,which will decrease with the increase of temperature and time;as the temperature build up,SWR will be reduced and destroyed after 300℃;SWR will decrease most obviously with the extension of heating time in the first 30 minutes and remain stable after 60 minutes;however,when the temperature reaches 300℃,the effect of heating time on SWR in topsoil is weakened.

关 键 词：土壤斥水性 干旱河谷 森林火灾 温度 时间 

分 类 号：S152.8[农业科学—土壤学]