A test of the mycorrhizal-associated nutrient economy framework in two types of tropical rainforests under nutrient enrichments  

作　　者：Qingshui Yu Suhui Ma Xiaofeng Ni Lai Jiang Zhang Zhou Jiangling Zhu Chengjun Ji Zhiyao Tang Xiaoli Cheng Jingyun Fang 

机构地区：[1]Institute of Ecology,College of Urban and Environmental Sciences,Key Laboratory for Earth Surface Processes of the Ministry of Education,Peking University,Beijing,100871,China [2]Research Institute of Tropical Forestry,Chinese Academy of Forestry,Guangzhou 510520,China [3]Key Laboratory of Soil Ecology and Health in Universities of Yunnan Province,School of Ecology and Environmental Science,Yunnan University,Kunming,650091,China

出　　处：《Forest Ecosystems》2023年第1期12-20,共9页森林生态系统（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.31988102);National Key Research and Development Program of China(No.2017YFC0503906)。

摘　　要：Shifts in tree species and their mycorrhizal associations driven by global change play key roles in biogeochemical cycles. In this paper, we proposed a framework of the mycorrhizal-associated nutrient economy(MANE), and tested it using nutrient addition experiments conducted in two tropical rainforests. We selected two tropical rainforests dominated by arbuscular mycorrhizal(AM) and ectomycorrhizal(ECM) trees, and established eighteen20 m×20 m plots in each rainforest. Six nitrogen(N) and phosphorus(P) addition treatments were randomly distributed in each rainforest with three replicates. We examined the differences in soil carbon(C) and nutrient cycling, plant and litter productivity between the two rainforests and their responses to 10-year inorganic N and P additions. We also quantified the P pools of plants, roots, litter, soil and microbes in the two rainforests. Overall,distinct MANE frameworks were applicable for tropical rainforests, in which soil C, N and P were cycled primarily in an inorganic form in the AM-dominated rainforest, whereas they were cycled in an organic form in the ECMdominated rainforest. Notably, the effects of mycorrhizal types on soil P cycling were stronger than those on C and N cycling. The intensified N and P deposition benefited the growth of AM-dominated rainforests instead of ECMdominated rainforests. Our findings underpin the key role of mycorrhizal types in regulating biogeochemical processes, and have important implications for predicting the ecological consequences of global changes.

关 键 词：Nutrient cycling Nutrient addition Mycorrhizal association Arbuscular mycorrhiza ECTOMYCORRHIZA Tropical rainforest 

分 类 号：S759.9[农业科学—森林经理学]