南京林业大学学报（自然科学版）2017，Vol.41Issue(2)：20-26,7.DOI:10.3969/j.issn.1000-2006.2017.02.004
河流植物群落下底泥中碳氮磷和重金属富集效应分析
Accumulation of carbon, nitrogen, phosphorus and heavy metals in sediment under plant communities in river
摘要
Abstract
[Objective]Investigate the mechanism of organic carbon (OC), total nitrogen (TN), total phosphorus (TP) and heavy metal ( As, Cd, Co, Cr, Cu, Hg, Ni, Pb, and Zn) accumulation in sediment of plant communities in river.[Method]We selected three sites dominated by Scirpus planiculmis and Sparganium stoloniferum each in shoal and shal?low water habitats of the Suo River, a tributary of the Huai River. We collected sediment from the surface layer ( 0-10 cm) , middle layer (≥10-20 cm) and sublayer (≥20-30 cm) of the plant communities and CK ( blank control) . We analyzed the accumulation of OC, TN, TP and heavy metals in the sediment of three layers using t?tests for independent samples;calculated relative enrichment index ( E) of OC, TN, TP and heavy metals in the sediment of three layers;and then used partial least squares regression to analyze the influence of various factors on each element's E.[Result]OC, TN, As, Cd, Cr, Hg, Ni, Pb and Zn were significantly enriched in sediment of the S. planiculmis and S. stolonife?rum communities. The enrichment effect mainly occurred in the surface sediment. Overall, the main factors influencing the elements' E values were the elements' background values in the sediment, followed by plant species, habitat type, and sediment texture. [Conclusion]The results of the present study provide a reference for the ecological restoration of polluted rivers. Planting local dominant species in polluted rivers helps transfer carbon, nutrient elements and some heavy metals from the river ecosystem into the sediment of the plant communities, especially into the surface sediment. The main driving forces may be plants' interception of particulate matter and nutrients in the water, as well as the decom?position and mineralization of plant litter and dead roots. It is also possible that S. planiculmis can absorb Cd, Cr, Hg, Pb and Zn and that S. stoloniferum can absorb As, Cd, Cr, Hg, Ni, Pb and Zn, although this requires validation.关键词
底泥/植物群落/总有机碳/营养元素/重金属/元素富集Key words
sediment/plant community/total organic carbon/nutrient elements/heavy metals/element enrichment分类
农业科技引用本文复制引用
王晓宇,盛晟,孔进,王莹莹,张小伟,刘茂松..河流植物群落下底泥中碳氮磷和重金属富集效应分析[J].南京林业大学学报（自然科学版）,2017,41(2):20-26,7.基金项目
国家水体污染控制与治理科技重大专项项目(2012ZX07204004) （2012ZX07204004）
国家自然科学基金项目(41271197,51309242) （41271197,51309242）
