Divergent responses of microbial networks to global change scenarios during alpine cushion plant degradationOA
The degradation of alpine cushion plants is known to disrupt soil microbial networks.To explore the mechanisms behind this,we collected soils across a degradation sequence on the Qinghai-Xizang Plateau and,using a microcosm approach,simulated the effects of three global change factors:warming(T),nitrogen addition(N),and dry-wet cycling(D).Our findingsindicated that fungal and bacterial networks exhibited contrasting structures and response patterns.Fungal networks displayed hub-dependent structure:they maintained complexity and enhanced robustness under T,N,and D,yet showed vulnerability when keystone nodes were preferentially removed.Bacterial networks exhibited connector-mediated redundancy that conferred high baseline robustness but limited adaptive capacity;their robustness did not increase under T or N,though assortativity rose under N.Network complexity showed nonlinear shifts across degradation stages.At two thresholds—individual-level Stage 3–4 and community-level balanced-to-stable transition—fungal networks reorganized while bacterial networks simplified.Both abiotic and biotic factors predicted network dynamics.Abiotic predictors included microbial biomass,nutrients,pH,and polyphenol oxidase(PPO)activity.Beyond these,keystone taxa abundance emerged as a biotic driver strongly correlated with bacterial network complexity,though this relationship was attenuated under warming.We propose a management framework that prioritizes protecting bacterial network integrity through mitigating warming and nitrogen deposition,targets prethreshold stages as intervention windows,and integrates soil-microbial indicators for early warning.This study provides a practical basis for predicting and managing microbial network dynamics in alpine tundra under global change.
Mengdie Yin;Yaojun Ye;Xin Liu;Wanyin Xiong;Shijian Liu;Hang Sun;Wenguang Sun;Yazhou Zhang
School of Life Sciences,Yunnan Normal University,Kunming 650000,China State Key Laboratory of Plant Diversity and Specialty Crops/Yunnan Key Laboratory for Plant Diversity and Biogeography,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China Southwest United Graduate School,Kunming 650092,ChinaState Key Laboratory of Plant Diversity and Specialty Crops/Yunnan Key Laboratory for Plant Diversity and Biogeography,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,ChinaState Key Laboratory of Plant Diversity and Specialty Crops/Yunnan Key Laboratory for Plant Diversity and Biogeography,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China School of Ecology and Environment,Southwest Forestry University,Kunming 650224,ChinaSchool of Life Sciences,Yunnan Normal University,Kunming 650000,China State Key Laboratory of Plant Diversity and Specialty Crops/Yunnan Key Laboratory for Plant Diversity and Biogeography,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,ChinaSchool of Life Sciences,Yunnan Normal University,Kunming 650000,China State Key Laboratory of Plant Diversity and Specialty Crops/Yunnan Key Laboratory for Plant Diversity and Biogeography,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China Southwest United Graduate School,Kunming 650092,ChinaState Key Laboratory of Plant Diversity and Specialty Crops/Yunnan Key Laboratory for Plant Diversity and Biogeography,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,ChinaSchool of Life Sciences,Yunnan Normal University,Kunming 650000,ChinaState Key Laboratory of Plant Diversity and Specialty Crops/Yunnan Key Laboratory for Plant Diversity and Biogeography,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China
农业科技
Alpine tundraCushion plant degradationSoil microcosmGlobal change scenariosMicrobial co-occurrence networks
《Plant Diversity》 2026 (4)
P.800-814,15
supported by the National Key R&D Program of China(2024YFF1306700)Key Projects of the Joint Fund of the National Natural Science Foundation of China(U23A20149)the Second Tibetan Plateau ScientificExpedition and Research(STEP)program(2024QZKK0200)the Key Research and Development Program of Yunnan Province(202403AC100028)the Yunnan Applied Basic Research Project(202401CF070057,202401AT070102)Yunnan Revitalization Talent Support Program‘Young Talent’ProjectIntroducing talents start-up fund of Kunming Institute of Botany,Chinese Academy of SciencesYunnan Caiyun Postdoctor Programthe Yunnan Research Innovation Promotion Program of the State Key Laboratory of Plant Diversity and Specialty Crops.
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