摘要
以西南喀斯特典型石漠化生态系统土壤为研究对象,采用空间替代时间的方法,研究石漠化演替过程中土壤表面电化学特征演变规律及其与土壤理化性质的相关性。采用物质表面联合分析法对不同石漠化等级土壤表面电化学属性进行测定。结果表明,土壤表面电荷密度、表面电场强度、比表面、表面电荷数量随石漠化强度的增加而下降,其变化范围分别为0.34 C·m^(-2)~0.42 C·m^(-2)、4.85×10^(8)V·m^(-1)~5.86×10^(8)V·m^(-1)、47.11 m^(2)·g^(-1)~53.16 m^(2)·g^(-1)、16.86 cmol·kg^(-1)~22.82 cmol·kg^(-1),土壤表面电位随石漠化强度的增加而上升,其变化范围为-113.74 mV~-115.10 mV;研究区黏土矿物组成为伊利石、高岭石、绿泥石、伊蒙混层、绿蒙混层,且以绿蒙混层为主;土壤黏粒、砂粒、非晶质氧化铝、胡敏酸是影响喀斯特石漠化地区土壤表面电化学属性变化的主要因素,解释率分别为48.3%、38.1%、13.0%、12.0%;土壤粒径组成、有机质组分和金属氧化物对土壤表面电化学特征影响由强到弱依次分别为:土壤黏粒>砂粒>粉粒,胡敏酸>有机碳>富里酸,非晶质氧化铝>游离氧化铁>非晶质氧化铁。本研究对中国西南喀斯特石漠化土壤管理与调控、退化植被恢复重建具有重要意义。
【Objective】Soil surface is the main place for various chemical and biochemical processes in soils and most of the negative charges are concentrated here.The five electrochemical characteristics,surface potential,surface charge density,surface electric field strength,specific surface area,and surface charge,deeply affect a series of physical and chemical processes in soils.Therefore,an accurate understanding of the electrochemical properties of soil surface has extensive and profound significance for the prevention and control of soil erosion,soil management and regulation,vegetation restoration and reconstruction in karst areas.However,it is still unclear how soil surface charge properties evolve with environmental factors change in different succession stages of rocky desertification.【Method】In this study the method of combined analysis of surface properties was applied to measure surface potential,surface charge density,surface electric field strength,specific surface area,and surface charge of the soils varying in different rocky desertification grades in Anshun area.Correlation and redundancy analyses were used to explore the effects of soil environmental factors on its surface electrochemical properties.【Result】Soil surface charge density,surface electric field strength,specific surface area,and surface charge decreased with the increase in rocky desertification intensity,and the variation range was 0.34 C·m^(-2)~0.42 C·m^(-2),4.85×10^(8) V·m^(-1)~5.86×10^(8) V·m^(-1),47.11 m^(2)·g^(-1)~53.16 m^(2)·g^(-1),16.86 cmol·kg^(-1)~22.82 cmol·kg^(-1),respectively.Also,the soil surface potential increased with the increase in rocky desertification intensity and the variation range was -113.74 mV~-115.10 mV.Soil clay,sand,amorphous alumina,and humic acid were the main factors affecting soil surface electrochemical properties change,and the interpretation rates were 48.3%,38.1%,13.0% and 12.0%,respectively.The effects of soil particle size composition,organic matter composition,and metal oxides on
作者
赵楚
盛茂银
李雨萱
白义鑫
刘树西
ZHAO Chu;SHENG Maoyin;LI Yuxuan;BAI Yixin;LIU Shuxi(Institute of Karst Research,Guizhou Normal University,Guiyang 550001,China;National Engineering Research Center for Karst Rocky Desertification Control,Guiyang 550001,China;Guizhou Engineering Laboratory for Karst Rocky Desertification Control and Derivative Industry,Guiyang 550001,China)
出处
《土壤学报》
CAS
CSCD
北大核心
2022年第3期756-766,共11页
Acta Pedologica Sinica
基金
贵州省科学技术基金(黔科合基础[2019]1224号)
贵州省优秀青年科技人才支持计划项目(黔科合平台人才[2017]5638)
贵州省科技计划项目(黔科合平台人才[2017]5726号)
贵州省研究生教育创新计划(黔教合YJSCXJH[2019]050)资助。
关键词
喀斯特
土壤表面电化学特征
石漠化
土壤理化性质
演变
Karst
Electrochemical properties of soil surface
Rocky desertification
Physical and chemical properties of soil
Evolution
