外生菌根真菌对油松幼苗根际土壤重金属赋存的影响  

Effects of Ectomycorrhizal Fungi on Heavy Metal Speciation in Rhizosphere of Pinus tabulaeformis Seedlings.

作　　者：黄艺[1] 李婷[1] 费颖恒[1] 

机构地区：[1]北京大学环境科学系,北京100871

出　　处：《生态与农村环境学报》2007年第3期70-76,共7页Journal of Ecology and Rural Environment

基　　金：国家自然科学基金(20677003)

摘　　要：油松幼苗接种菌根盆栽试验表明,外生菌根真菌对油松根际土壤重金属铜、镉的赋存形态产生显著影响。与普通根际相比,菌根际土壤中交换态铜、镉含量显著下降,而有机结合态含量则显著增加。菌根际土壤重金属形态呈现出由疏松结合态向紧密结合态转化的趋势。接种菌根显著降低根际重金属的生物有效性,缓解重金属对寄主植物的毒害作用。Heavy metal speciation in the rhizospheric soil of Pinus tabulaeformis seedlings was significantly influenced by inoculation of ectomycorrhizal fungi. Compared with CK,the inoculated rhizosphere was much lower in content of exchangeable copper and cadmium, but much higher in content of organically bonded forms, showing a remarkable tendency of loosely associated forms transforming into tightly associated forms. Ectomycorrhizae evidently decreased bioavailability of heavy metal in the rhizosphere, and alleviated the damage of heavy metal to its host plant.

关 键 词：外生菌根真菌 油松 根际 重金属 赋存形态 

分 类 号：X53[环境科学与工程—环境工程] Q142[生物学—生态学]