贵州典型岩溶区不同植被类型下碳酸盐岩溶蚀速率及影响因素  

Carbonate Rock Dissolution Rates and Their Influencing Factors under Different Vegetation Types in Karst Areas of Guizhou

作　　者：李源永 周华 丁访军 吴鹏 叶雨艳 崔迎春 LI Yuanyong;ZHOU Hua;DING Fangjun;WU Peng;YE Yuyan;CUI Yingchun(Key laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region(Ministry of Education),College of Life Sciences/Institute of Agro-bioengineering,Guizhou University,Guiyang 550025,China;Guizhou Academy of Forestry,Guiyang 550005,China;Guizhou Libo Karst Forest Ecosystem National Observation and Research Station,Libo Guizhou 558400,China;Guizhou Liping Rocky Desertification Ecosystem National Observation and Research Station,Qiandongnan Prefecture Guizhou 556200,China)

机构地区：[1]贵州大学生命科学学院/农业生物工程研究院山地植物资源保护与种质创新教育部重点实验室,贵阳550025 [2]贵州省林业科学研究院,贵阳550005 [3]贵州荔波喀斯特森林生态系统国家定位观测研究站,贵州荔波558400 [4]贵州黎平石漠化生态系统国家定位观测研究站,贵州黔东南州556200

出　　处：《地球与环境》2024年第4期489-499,共11页Earth and Environment

基　　金：国家自然科学基金项目(31760240);贵州省林业碳汇监测技术研究(黔财资环〔2022〕36号)。

摘　　要：为探究不同岩溶区不同植被类型下碳酸盐岩溶蚀特征及其影响因素。采用溶蚀试片法研究贵州茂兰自然保护区(ML)、镇宁沙子乡(SZ)、兴义郑屯镇(ZT)和施秉干竹槽(GZ)4个典型岩溶区不同植被类型下的溶蚀速率,并分析其主要影响因素。结果表明:不同岩溶区基岩试片、标准试片在一年和一年半的溶蚀速率为2.37~7.42 mg/(cm^(2)·a),溶蚀速率大小表现为SZ>GZ>ML>ZT。4个岩溶区不同植被类型下的试片溶蚀速率存在明显差异,ML和GZ的试片溶蚀速率表现为乔木林>灌木林>草地,SZ和ZT的试片溶蚀速率表现为灌木林大于乔木林和草地,说明不同岩溶区乔木林和灌木林能明显促进碳酸盐岩溶蚀;在土壤0~30 cm,试片溶蚀速率整体随土层增加而增加。ML和ZT的溶蚀速率主要受到土壤CO_(2)含量和土壤pH的影响;SZ主要受到土壤pH和土壤含水量的影响;GZ主要受到土壤CO_(2)含量和土壤有机碳的影响,可见土壤因子对不同岩溶区溶蚀速率的影响存在差异。该研究可为岩溶碳汇精准估算和生态修复与保护提供参考依据。To explore the characteristics and influencing factors of carbonate rock dissolution in diverse vegetation types among different karst areas,correlation regression and random forest analysis,dissolution testing as well as other statistical methods were used to quantify the dissolution rate and influencing factors of different vegetation types(arbor forest,shrub forest and grassland)in four karst areas in Guizhou:the Maolan National Nature Reserve(ML),Shazi Township in Zhenning County(SZ),Zhengtun Town in Xingyi City(ZT),and Ganzhucao in Shibing County(GZ).The results show that the average dissolution rate of bedrock and standard rock tablets in different karst areas over one year and one and a half years ranged from 2.37 to 7.42 mg/(cm^(2)·a).The dissolution rate was in order of SZ>GZ>ML>ZT.The dissolution rates of standard rock tablets were generally higher than that of bedrock tablets,but the opposite situation also existed;the dissolution increments from one year to one and a half years were greater in arbor forests than in shrub forests and grasslands.There were remarkable differences in the dissolution rates of carbonate rocks under different vegetation types among the four karst areas.The dissolution rates in ML and GZ were in order of arbor forest>shrub forest>grassland,while the dissolution rates in SZ and ZT were higher in shrub forests than that in arbor forests and grasslands,indicating that arbor and shrub forests in different karst areas can significantly promote carbonate rock dissolution.At the soil depth of 0-30 cm,the dissolution rate increased with the soil depth.The dissolution rates in ML and ZT were mainly affected by soil CO_(2)content and pH,whereas the dissolution rate in SZ was mainly governed by soil pH and water content.In comparison,the dissolution rate in GZ was mainly influenced by soil CO_(2)and organic carbon contents,reflecting that soil physicochemical properties have different impacts on dissolution rates in different karst areas.Overall,the dissolution rates of the four karst

关 键 词：贵州岩溶区 溶蚀速率 植被类型 影响因素 

分 类 号：P641[天文地球—地质矿产勘探]