摘要
选择3个五节芒在重金属污染地的定居点作为研究样地,其中两个为Pb/Zn矿尾矿砂堆积地(W:黄岩铅锌尾矿;Y:三门铅锌尾矿),一个为冶炼厂附近污染农田(N),分别测定其根围与根际土壤微生物基础呼吸、微生物量碳、微生物量氮、土壤理化特性和土壤重金属含量.结果表明:根际土壤微生物基础呼吸和微生物量氮均显著地高于根围土壤(P<0.05),除了N样地外,微生物量碳在根围与根际之间差异不显著(P>0.05).根际土壤有机碳、总氮(Y样地除外)和离子交换量(N样地除外)低于根围土壤.根际重金属(Pb、Zn、Cu、Cd)总量与DTPA(二乙三胺五乙酸)可提取量普遍低于根围土壤.冗余分析(RDA)表明,根围和根际土壤微生物与土壤理化特性呈不同程度的正相关,而与土壤重金属含量呈现不同程度的负相关.主分量及回归分析同样证明土壤微生物总体变化与土壤理化特性呈正相关(根围R2=0.653;根际R2=0.690),而与重金属含量呈负相关(根围R2=0.610;根际R2=0.662).
Three habitats of Miscanthus floridttlus in Zhejiang Province, i. e. , Pb/Zn mine tailings in Huangyan area （W）, Pb/Zn mine tailings in Sanmen area （Y） , and heavy metals contaminated agricultural field near smelters （N）, were chosen as sampling sites, and the microbial basal respiration, microbial biomass carbon and nitrogen, physical and chemical properties, and heavy metals contents in bulk and rhizosphere soils were determined. The results indicated that the microbial basal respiration and microbial biomass nitrogen were significantly higher in rhizosphere soil than in bulk soil （P 〈 0. 05 ）, while microbial biomass carbon, except that in site N, had no significant difference between bulk soil and rhizosphere soil （P 〉 0. 05 ）. The organic carbon, total nitrogen （except in site Y）, and cation exchangeable capacity （except in site N） were lower in rhizosphere soil than in bulk soil, and the total and DTPA-extractable Pb, Zn, Cu and Cd were generally lower in rhizosphere soil than in bulk soil. Redundancy discriminant analysis （RDA） showed that the mi- crobial parameters in bulk and rhizosphere soils had definite and chemical properties, and negative correlations with soil positive correlations with soil physical heavy metals contents. Principal components analysis （PCA） and regression analysis also showed that the overall changes in microbial parameters were positively correlated with soil physical and chemical properties （bulk soil： R^2 = 0. 653; rizhosphere soil： R^2 = 0. 690）, and negatively correlated with soil heavy metal contents （bulk soil： R^2 =0. 610; rizhosphere： R^2 =0. 662）.
出处
《应用生态学报》
CAS
CSCD
北大核心
2008年第8期1835-1840,共6页
Chinese Journal of Applied Ecology
基金
浙江省自然科学基金资助项目(Y507053)
关键词
五节芒
重金属
污染
土壤微生物
Miscanthus floridulus
heavy metal
pollution
soil microorganism.
