喀斯特森林群落不同演替区土壤铅污染评价  

Evaluation of Soil Lead Pollution in Different Succession Areas of Karst Forest Community

作　　者：管海洋 张桂玲 罗绪强[1,3,4] 赵升 王绍英[1] 李雪 马浪 GUAN Haiyang;ZHANG Guiling;LUO Xuqiang;ZHAO Sheng;WANG Shaoying;LI Xue;MA Lang(School of Geography and Resources,Guizhou Education University,Guiyang 550018,China;School of Chemistry and Materials Science,Guizhou Education University,Guiyang 550018,China;Karst Ecosystem Observation Research Station in Puding,Chinese Academy of Sciences,Puding 562100,China;Guizhou Provincial Key Laboratory of Geographic State Monitoring of Watershed,Guiyang 550018,China)

机构地区：[1]贵州师范学院地理与资源学院,贵州贵阳550018 [2]贵州师范学院化学与材料学院,贵州贵阳550018 [3]中国科学院普定喀斯特生态系统观测研究站,贵州普定562100 [4]贵州省流域地理国情监测重点实验室,贵州贵阳550018

出　　处：《环境科学与技术》2021年第2期33-39,共7页Environmental Science & Technology

基　　金：国家自然科学基金项目(41563007);贵州师范学院大学生创新训练计划项目(20195201066,201914223027);贵州省优秀青年科技人才专项资金项目(黔科合人字[2015]21号);贵州师范学院2020年度校级科学研究基金博士项目(2020BS002)。

摘　　要：为探讨自然条件下退化喀斯特森林不同演替阶段植物群落表层土壤中的Pb含量及其潜在生态风险,该研究选取中国科学院普定喀斯特生态系统观测研究站的陈旗小流域为研究区,分别对流域内5个演替阶段植物群落表层土壤中的Pb含量进行了测定分析。结果表明:(1)研究区表层土壤中的Pb含量主要分布在59.75~163.00 mg/kg之间,平均值为123.74 mg/kg,不同演替阶段植物群落表层土壤中的Pb含量均远高于贵州省A层土壤Pb含量的背景值。(2)随着喀斯特森林群落演替的正向进行,表层土壤中的Pb含量呈现出递减趋势且群落间的差异极显著(p<0.01),空间变异主要是由植被状况等自然因素的结构性变异引起的。(3)研究区各演替阶段植物群落表层土壤中的Pb含量单因子污染指数的评价结果均为较严重,地积累污染指数的评价结果均为中度污染,内梅罗综合污染指数的评价结果均为重度污染,而潜在生态风险指数的评价结果均为无风险。In order to investigate the Pb content in the topsoil of plant communities in different succession stages of degraded karst forest under natural conditions and its potential ecological risks,the Chenqi small watershed of Puding Karst Ecosystem Observation and Research Station of Chinese Academy of Sciences was selected as the study area,and the Pb content in the topsoil of five successional stages in the watershed was determined and analyzed.The results showed that the content of Pb in the topsoil of the study area was mainly distributed between 59.75 mg/kg and 163.00 mg/kg,with an average of 123.74 mg/kg.The Pb content in the topsoil of plant communities in different succession stages was much higher than the background value of Pb content in soil of A layer in Guizhou Province.With the succession of karst forest community going forward,the Pb content in topsoil showed a decreasing trend,and the difference between communities was very significant(p<0.01).The spatial variation was mainly caused by the structural variation of natural factors such as vegetation status.The results of single factor pollution index of Pb content in the surface soil of plant communities in each succession stage were serious,the evaluation results of soil accumulation pollution index were all moderate pollution,the evaluation results of Nemerow comprehensive pollution index were all severe pollution,and the evaluation results of potential ecological risk index were all risk-free.

关 键 词：喀斯特植物群落 表层土壤 重金属含量 污染指数 潜在生态风险 

分 类 号：X53[环境科学与工程—环境工程]