毛竹林下丛枝菌根类和外生菌根类树种幼树种内和种间竞争研究  

Intra-specific and Inter-Specific Competition of Arbuscular Mycorrhizal and Ectomycorrhizal Tree Saplings in A Subtropical Phyllostachys edulis Forest

作　　者：徐佳文 罗晓敏 涂运健 万松泽 毛瑢 XU Jiawen;LOU Xiaomin;TU Yunjian;WAN Songze;MAO Rong(Key Laboratory of State Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed,College of Forestry,Jiangxi Agricultural University,Nanchang 330045,China;Matoushan National Nature Reserve in Jiangxi Province,Fuzhou,Jiangxi 335300,China)

机构地区：[1]江西农业大学林学院/国家林业和草原局鄱阳湖流域森林生态系统保护与修复实验室,江西南昌330045 [2]江西马头山国家级自然保护区管理局,江西抚州335300

出　　处：《江西农业大学学报》2021年第5期1107-1115,共9页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家自然科学基金项目(41867007);中央财政林业科技推广示范项目(JXTG[2021]14)。

摘　　要：【目的】菌根类型是影响树木个体生长发育的重要因素,因此可能在种群层次上影响树种的竞争格局。探究毛竹(Phyllostachys edulis)林林下丛枝菌根和外生菌根树种的种内和种间竞争关系,可为亚热带毛竹林群落演替动态的预测和森林物种共存理论的完善提供理论参考。【方法】本研究选择江西马头山国家级自然保护区毛竹林林下更新层典型丛枝菌根树种野含笑(Michelia skinneriana)和外生菌根树种少叶黄杞(Engelhardtia fenzlii)为研究对象,采用Hegyi单木竞争模型分析野含笑和少叶黄杞的种内和种间竞争状况,解析毛竹林林下更新层不同菌根类树种的定植机制。【结果】野含笑幼树种间竞争占总竞争强度的87.04%,且随着幼树个体胸径的增加,种间竞争强度的相对比重逐渐增加,证明野含笑幼树在生长过程中自疏作用较强,在小尺度上同种个体较难共存。少叶黄杞幼树种内和种间竞争分别占总竞争强度的54.64%和45.36%,且随着幼树个体胸径的增加,种内和种间竞争强度逐渐降低,但二者的相对比重基本不变,证明少叶黄杞幼树在生长过程中自疏和他疏作用强度相当,与同种或他种植物可以实现共存。【结论】毛竹林下这两种菌根类型幼树在生长过程中受到的竞争来源存在较大的差异。因此,树木菌根类型是调控亚热带毛竹林林下更新层幼树竞争格局的重要因素,并对群落演替的方向有着潜在影响。[Objective]Mycorrhizal type is of great importance in growth and development of tree individuals,and has a potenial influence on the competetive pattern of tree population.This study investigated the difference in the patterns of intra-specific and/or inter-specific competition between arbuscular mycorrhizal(AM)tree species and ectomycorrhizal(ECM)tree species in subtropical Phyllostachysedulis forest.The results would contribute to the prediction of Phyllostachysedulis forest succession and improve understanding of species coexistence mechanism in forest ecosystems.[Method]In the present study,the saplings of Michelia skinneriana(AM treespecies)and Engelhardtia fenzlii(ECM treespecies)were selected to study their competition patterns in Phyllostachys edulis forests in the Matoushan National Nature Reserve,Jiangxi Province.Hegyi competition model was used to quantify their intra-and inter-specific competition and analyze their colonization mechanisms.[Result]For M.skinneriana saplings,their inter-specific competition accounted for 87.04% of their total competition intensity,and the relative proportion of their inter-specific competition intensity gradually increased with the increase of DBH,which suggested that the self thinning effect of M.skinneriana was strong during the growth process,and it was difficult for the same species to co-exist on a small scale.However,it was observed that their intra-specific and inter-specific competition accounted for 54.64% and 45.36% of the total competition intensity for E.fenzlii saplings,respectively.With the increase of DBH of saplings,the intra-specific and inter-specific competition intensity gradually decreased,but the relative proportion of the two types of competition was nearly unchanged,which indicated that the self thinning and other thinning intensity of E.fenzliisaplings were equivalent in the growth process,and they could co-exist with the same or other plants.[Conclusion]The results suggest that a substantial difference exists in the competition sources between(

关 键 词：物种更新 丛枝菌根 外生菌根 竞争模型 毛竹林 

分 类 号：S718.54[农业科学—林学]