Effects of Long-term Heavy Metal Contamination on Nematode Community Structure and Carbon Flow
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.
gold mining areaheavy metal pollutionnematode communitynematode metabolic footprint
万方数据
维普
