长期重金属污染对线虫群落结构和碳流的影响  

Effects of Long-term Heavy Metal Contamination on Nematode Community Structure and Carbon Flow

作　　者：杜闫彬 时金帅 冯洋 刘晓霞 于彩虹[1] DU Yanbin;SHI Jinshuai;FENG Yang;LIU Xiaoxia;YU Caihong(School of Chemical&Environmental Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China;Beijing Cultivated Land Construction and Protection Centre,Beijing 100074,China)

机构地区：[1]中国矿业大学(北京),化学与环境工程学院,北京100083 [2]北京市耕地建设保护中心,北京100074

出　　处：《环境科学与技术》2024年第1期1-10,共10页Environmental Science & Technology

基　　金：国家自然科学基金项目(41977029)。

摘　　要：为探明长期复合重金属污染对线虫群落和碳流动的影响,该文分析了矿区4个区域(NC、C1、C2、C3)土壤理化性质和重金属污染对土壤线虫及其食物网碳流动的影响。结果表明:NC和C1分别属于轻微和中等生态风险,C2和C3属于极强生态风险,As、Pb、Cd风险最严重;共有29个属被鉴定出来,优势属(>10%)为真滑刃属和头叶属;随重金属潜在生态风险增强,线虫数量明显减少且结构指数(SI)和富集指数(EI)显著降低,冗余分析和相关性分析表明重金属潜在生态风险(RI)对线虫群落有显著影响,且与c-p1、c-p5、真菌食性和捕食杂食性线虫丰度呈显著负相关,与植物食性线虫丰度呈显著正相关;路径分析表明,重金属污染明显影响了线虫食物网碳的流通途径,并降低了碳流动均匀性。To explore the effects of long-term heavy metal pollution on nematode community structure and carbon flow,this study analyzed the effects of soil physicochemical properties and heavy metal contamination on nematode abundance,ecologi-cal indices,community structure and food web carbon flow in four areas(NC,C1,C2 and C3).The results showed different degrees of ecological risks posed by heavy metals in the sampling area,with NC classified as having low ecological risk,C1 having moderate ecological risk,and C2 and C3 having high ecological risks primarily caused by Cd,Pb and As.A total of 29 nematode genera were identified across all sampling sites,with the genus Paratylenchus and Cephalobus as the main dominant genera(>10%).In areas with enhanced ecological risk from heavy metals,nematode populations were significantly reduced and the structural index(SI)and enrichment index(EI)were significantly lower.RDA analysis and correlation analy-sis showed a significant effect of heavy metal potential ecological risk on nematode communities.Heavy metal ecological risk index(RI)was mainly negatively and significantly correlated with c-p1,c-p5,fungivores nematodes and omnivores-preda-tors nematode abundance and positively with plant parasites nematode abundance.Heavy metal contamination significantly affects nematode food web carbon flow and reduces carbon flow uniformity in pathway analysis.

关 键 词：金矿区 重金属污染 线虫群落 线虫代谢足迹 

分 类 号：X825[环境科学与工程—环境工程]