丛枝菌根菌丝对重金属元素Zn和Cd吸收的研究

丛枝菌根菌丝对重金属元素Ｚｎ和Ｃｄ吸收的研究陶红群李晓林张俊伶（中国农业大学资源与环境学院，北京１０００９４）关键词丛枝菌根；锌；镉．近年来，由于工业排放及一些农业措施（如污灌等）造成许多土壤中重金属元素的污染．其中锌和镉是两个较为重要的重金属污染...

UPTAKE OF Zn AND Cd BY HYPHAE OF AN ARBUSCULAR MYCORRHIZAL FUNAI (G.MOSSEAE) ASSOCIATED WITH RED CLOVER

Uptake of Zn and Cd by hyphae of an arbuscular mycorrhizal fungi associated with red clover was stuided using threecompartment pot experiment separated with 30μm nylon nets.The central compartment for root growth and two outer ones for growth of arbuscular mycorrhizal hyphae.Zn and Cd were applied at three levels (0,50 and 200mg/kg) respectivley in the two outer compartments.Arbuscular mycorrizal fungus (G.mosseae) was inoculated or uninoculated to test the direct hyphae contribution to Zn and Cd uptake by the plants.The results showed that there was no significant difference in shoot dry weight among all treatments.Increased Zn and Cd were observed due to the inoculation of mycorrhizal fungi with Zn and Cd applied.With a dosage of 50mg/kg in the outer compartment,the contribution of mycorrhizal hyphae to plant uptake accunted for up to 22.4% of the total Zn uptake and 53.6% of the total Cd uptake.With 200mg/kg applied,the contribution of mycorrhizal fungi to plant total Zn and Cd uptake accounted for up to 8.1% and 63.5%,respectively.