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

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Forest Ecosystems 2023年第1期10卷 12-20页

作者： Qingshui Yu Suhui Ma Xiaofeng Ni Lai Jiang Zhang Zhou Jiangling Zhu Chengjun Ji Zhiyao Tang Xiaoli Cheng Jingyun Fang Institute of Ecology College of Urban and Environmental SciencesKey Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing100871China Research Institute of Tropical Forestry Chinese Academy of ForestryGuangzhou 510520China Key Laboratory of Soil Ecology and Health in Universities of Yunnan Province School of Ecology and Environmental ScienceYunnan UniversityKunming650091China

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

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The rhizosphere effect on soil gross nitrogen mineralization: A meta-analysis

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Soil Ecology Letters 2022年第2期4卷 144-154页

作者： Dayong Gan Hui Zeng Biao Zhu Institute of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China School of Urban Planning and Design Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China

Rhizosphere effects play crucial roles in determining soil carbon(C)and nitrogen(N)***,the rhizosphere effect on soil gross nitrogen(N)mineralization(Nmin)has not been quantitatively assessed on the global *** we performed a meta-analysis of compiled data from 24 publications and 37 species to synthesize the rhizosphere effect on soil gross Nmin and its influencing *** found that the rhizosphere effect significantly enhanced soil gross Nmin by 81%on *** rhizosphere effect was significantly higher in woody species than in nonwoody species,and higher in ECM(ectomycorrhizal)associated species than in AM(arbuscular mycorrhizal)associated ***,the variations of the rhizosphere effect on soil gross Nmin were correlated with those on soil C mineralization,phenol oxidase activity and root biomass rather than with other plant(growth form and mycorrhizal association)and climatic(mean annual temperature and precipitation)*** results support the‘microbial activation’and‘microbial N mining’hypotheses of rhizosphere effects and indicate the coupling of soil C and gross N mineralization in the ***,these findings provide novel insights into the rhizosphere effect on soil gross Nmin among plant growth forms and mycorrhizal associations,and improve our mechanistic understanding of soil N dynamics in the rhizosphere.

关键词： Rhizosphere effect Carbon mineralization Nitrogen mineralization Microbial biomass mycorrhizal association Plant-soil interaction

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