铅硐山铅锌矿区植物丛枝菌根真菌和深色有隔内生真菌初步研究

he resource and distribution of arbuscular mycorrhizal fungi (AMF) and dark septate endophytes (DSE) in four sampling areas in Qiandongshan Pb-Zn mine, Fengxian county, Shaanxi province, was investigated. 55 root samples of 36 different plants species in 20 families were analyzed, and the results showed that 49 samples (about 89.1% of the total) were typically colonized by AMF. Among the 30 plant species that infected with AMF, 17 of them (about 56.7%) formed Arum-type AM, and 9 plant species (about 30%) formed Paris-type, whereas only 4 plants belonged to I-type, Arum-type was more dominant than other types. The distribution of AMF spores in all rhizosphere soil samples was unevenly. AMF spore density ranged 8-684 per 100 g soil with an average of 150. No correlations were observed between the spore denstity and the AMF colonization rate (P>0.05). 46 root samples (about 83.6% of the total) were found colonized by DSE. Meanwhile, 40 samples were simultaneously colonized by AMF and DSE and accounted for 72.7% of the total samples. DSE colonization rate was significantly positively correlated with the total Zn content of soil (P<0.05). These results indicated that AMF and DSE commonly occur in Qiandongshan Pb-Zn mine, especially DSE has excellent heavy metal tolerance and adaptability.