PHYTO-ACCUMULLATION OF HEAVY METALS AND CHARACTERISTICS OF RHIZOSPHERE MICROBES IN HEAVY METAL CONTAMINATED SOILS, QIXIA, NANJING
Five species of plants and their rhizospheric soils were sampled and collected from heavy metal contaminated soils in Qixia, Nanjing for analysis and exploration of characteristics of phyto-accumulation and relationships of contents of heavy metals with population of bacteria and activity of soil enzymes in the soil. It was found that the heavy metal pollutant in the rhizosphere was dominated with Zn and Cd; and the plants growing therein were quite high in heavy metal absorbing capacity. Beckmannia grass and Solatium nigrum featured the characteristics of a heavy metal hyperaccumulator plant. The numbers of bacteria and Pb-resistant bacteria in the rhizospheric soil both reached up to 107 CFU g'1 of soil. The activities of soil enzymes were little inhibited. Significant positive relationships were observed of heavy metals contents in the plant with contents and forms of the heavy metals in the soil, soil enzymes activity, and Pb-resistant bacteria. Soil bacteria in the rhizosphere, heavy metal-resistant bacteria in particular, may improve bioavailability of heavy metals in soil, thus promoting uptake and transport of heavy metals by plants.
Heavy metal contaminated soilRhizospere bacteriaHyperaccumulator plant
国家科技期刊平台
NSTL
万方数据
维普
