武夷山杉木林丛枝菌根真菌沿海拔的变化特征及其影响因素  

Changes of Arbuscular Mycorrhizal Fungi in Cunninghamia lanceolata Forests Along an Elevation Gradient in Wuyi Mountain

作　　者：刘珏伶 曹聪 阮超越 姜永孟 李晓杰[1,2] 熊小玲 吕茂奎[1,2] 谢锦升[1,2] LIU Jueling;CAO Cong;RUAN Chaoyue;JIANG Yongmeng;LI Xiaojie;XIONG Xiaoling;LÜMaokui;XIE Jinsheng(Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education,Fujian Normal University,Fuzhou 350117,China;School of Geographical Sciences&School of Carbon Neutrality Future Technology,Fujian Normal University,Fuzhou 350117,China)

机构地区：[1]福建师范大学湿润亚热带生态地理过程教育部重点实验室,福州350117 [2]福建师范大学地理科学学院、碳中和未来技术学院,福州350117

出　　处：《亚热带资源与环境学报》2024年第2期15-22,共8页Journal of Subtropical Resources and Environment

基　　金：国家自然科学基金项目(32001169,31870604)。

摘　　要：丛枝菌根共生体是丛枝菌根真菌(Arbuscular Mycorrhizal Fungi,AMF)与宿主植物之间形成的互惠共生形式。共生体中的碳、氮、磷交换和代谢影响着宿主植物和共生真菌之间的营养平衡和资源重新分配,对陆地生态系统植物体的生长发育具有重要作用。本研究以武夷山3个海拔(1400 m,800 m,200 m)杉木人工林为研究对象,分析了不同海拔杉木林根际土壤、杉木特征指标之间的总体差异,以及海拔梯度中主导AMF变化的环境影响因素。结果表明:土壤有机碳、可溶性有机碳、微生物生物量碳含量均随海拔的升高而显著增加;不同海拔杉木林中,AMF特征指标除侵染率不变外,孢子、球囊霉素和菌丝密度均随海拔呈上升趋势。综合主成分分析第一和第二主成分各因子贡献值表明,土壤有机碳、温度、含水率、可溶性有机碳、总氮以及微生物生物量碳是影响AMF变化的重要因素;冗余分析结果进一步表明,可溶性有机碳对AMF影响最大,说明海拔梯度上易利用底物可能是影响杉木AMF特征变化的关键因子。研究结果对于了解和预测AMF如何调控亚热带杉木林生态系统功能及其对气候变化的响应具有重要意义。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 symbiontic 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 rhizosphere 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 indexes 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 implications for understanding and predicting how AMF regulates the ecosystem function of subtropical C.lanceolata forests and its response to

关 键 词：杉木林 丛枝菌根真菌 海拔梯度 土壤可溶性有机碳 

分 类 号：S718[农业科学—林学]