首页  |  本刊简介  |  编委会  |  投稿须知  |  订阅指南  |  联系我们  |  微信  |  出版道德声明  |  Ei收录本刊数据
西南典型“退耕还林”区土地利用/覆被变化对土壤中硒及重金属含量的影响
摘要点击 597  全文点击 86  投稿时间:2021-09-04  修订日期:2021-11-09
查看HTML全文 查看全文  查看/发表评论  下载PDF阅读器
中文关键词  土地利用/覆被变化    重金属  有机质  退耕还林
英文关键词  land use/land cover change  selenium  heavy metals  soil organic matter  return cropland to forest
作者单位E-mail
刘永林 重庆师范大学地理与旅游学院, 重庆 401331
重庆师范大学GIS应用研究重点实验室, 重庆 401331 
liu3986130@163.com 
刘属灵 重庆师范大学地理与旅游学院, 重庆 401331
重庆师范大学GIS应用研究重点实验室, 重庆 401331 
 
吴梅 重庆师范大学地理与旅游学院, 重庆 401331
重庆师范大学GIS应用研究重点实验室, 重庆 401331 
 
田兴磊 山东省地质科学研究院, 济南 250013 xinglei_tian@163.com 
刘双燕 重庆师范大学地理与旅游学院, 重庆 401331
重庆师范大学GIS应用研究重点实验室, 重庆 401331 
 
中文摘要
      人类活动(土地利用)和环境变化(土地覆被变化)对土壤中硒和重金属含量分布具有重要影响."退耕还林"生态工程的实施改变了土地利用/覆被,为研究土地利用/覆被变化对土壤中硒和重金属影响提供了理想的实验场所.在西南典型"退耕还林"区,采集了旱地、水田和林地(天然林地和次生林地)的91件表层土壤样品.测定和分析了土壤中硒、重金属、pH和有机质等参数.结果表明:①研究区表土中ω(Se)(0.42×10-6)、ω(As)(13.0×10-6)和ω(Sb)(1.03×10-6)均值显著高于渝西地区的土壤背景值;②人工次生林地表土中Se、Cd、Cr、Ni、Pb和Zn含量都显著高于旱地,表明"退耕还林"工程的实施可能会显著影响表土中硒和重金属富集;③土壤有机质(SOM)含量水平是控制表土中硒和重金属含量差异的重要因子.结果发现土地利用/覆被变化通过影响土壤pH和SOM间接深刻地影响土壤中硒和重金属迁移和富集.
英文摘要
      Human activities (land use) and environmental change (land cover change) affect the concentration of Se and heavy metals in soils. The implementation of the "Return Cropland to Forest (RCF)" ecological project has changed the land use and cover, which has provided an ideal experimental area for studying the effects of land use and cover change on selenium (Se) and heavy metals in the soil. In this study, 91 top soil samples from different land use and land cover types, including dry land, paddy land, natural forest land, and secondary forest land, were collected, and the contents of Se, heavy metals, and soil organic matter (SOM) and pH were analyzed. The results showed that:① the average values of ω(Se) (0.42×10-6), ω(As) (13.0×10-6), and ω(Sb) (1.03×10-6) were higher than the soil background values of western Chongqing. ② The concentrations of Se, Cd, Cr, Ni, Pb, and Zn in soils from secondary forest land were significantly higher than those from dry land soils, suggesting that the Se and heavy metals might have significantly increased in the surface soil after the implementation of the RCF ecological project. ③ The SOM was the key controlling factor for the enrichment and distribution of Se and heavy metals in the top soils. Our results indicated that the land use and land cover change would deeply impact the concentrations of Se and heavy metals in the top soils via influencing the soil properties, especially the SOM.

您是第34255461位访客
主办单位:中国科学院生态环境研究中心 单位地址:北京市海淀区双清路18号
电话:010-62941102 邮编:100085 E-mail: hjkx@rcees.ac.cn
本系统由北京勤云科技发展有限公司设计  京ICP备05002858号-2