Changes of Arbuscular Mycorrhizal Fungi in Cunninghamia lanceolata Forests Along an Elevation Gradient in Wuyi Mountain
Arbuscular mycorrhizal symbiosis is a mutualistic form between arbuscular mycorrhizal fungi(AMF)and host plants.The exchange and metabolism of carbon,nitrogen and phosphorus in symbion-tic organism affect the nutrientional balance and resource redistribution between host plants and symbiotic fungi,and play an important role in the growth and development of plants in terrestrial ecosystem.This study aims to explore the influence of altitude on AMF in Cunninghamia lanceolata forests and to find out the key factors affecting the growth and development of AMF.In this study,the roots and rhizo-sphere soil of C.lanceolata forests at three altitudes(200 m,800 m,1400 m)of Wuyi Mountain were collected and measured.The overall difference between the rhizosphere soil and the characteristic inde-xes of Chinese fir at different altitudes was analyzed,as well as the environmental factors that dominate the AMF changes in the altitude gradient.The results showed that the contents of soil organic carbon,dissolved organic carbon and microbial biomass carbon increased significantly with the increase of elevation.In C.lanceolata forests at different elevations,the density of spores,glomalin and mycelium density showed an increasing trend with the elevation except for the infection rate of AMF.According to the contribution values of factors of the first and second principal components in the comprehensive principal component analysis,soil organic carbon,temperature,water content,dissolved organic carbon,total nitrogen and microbial biomass carbon were the important factors affecting the change of AMF.The results of redundancy analysis further revealed that dissolved organic carbon had the greatest effect on AMF,indicating that the availability of easily-used substrates was the key factor affecting the characteristic of AMF along the elevation gradient.The results of this study provided important implica-tions for understanding and predicting how AMF regulates the ecosystem function of subtropical C.lan-ceolata forests and its response to climate change.
Chinese fir forestsarbuscular mycorrhizal fungielevation gradientdissolved organic carbon
NETL
NSTL
万方数据
