Nitrogen addition alters interactions between ectomycorrhizal host trees and fungal communities in a mixed mycorrhizal tropical rainforest

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2025-03-04 DOI:10.1007/s11104-025-07327-4

Georgia S. Seyfried, Joseph D. Edwards, James W. Dalling, Angela D. Kent, Wendy H. Yang

{"title":"Nitrogen addition alters interactions between ectomycorrhizal host trees and fungal communities in a mixed mycorrhizal tropical rainforest","authors":"Georgia S. Seyfried, Joseph D. Edwards, James W. Dalling, Angela D. Kent, Wendy H. Yang","doi":"10.1007/s11104-025-07327-4","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Background and aims</h3><p>Interactions among ectomycorrhizal (ECM) trees, fungal communities and ecosystem-scale N availability can drive carbon (C) and nitrogen (N) cycling at the tree scale, but these mechanisms have largely been tested in N-limited ecosystems. We investigated the role of ECM and saprotrophic (SAP) fungal communities in suppressing inorganic N cycling beneath ECM trees in a tropical rainforest where biotic and abiotic factors can drive rapid N cycling at the ecosystem scale. Based on knowledge from temperate and boreal forests, we expected to observe a decrease in ECM:SAP fungal ratios and a shift in the ECM fungal community composition with increasing inorganic N availability.</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>We quantified fungal community metrics and soil chemical properties in a long-term N addition experiment located in a lower montane tropical rainforest. We measured the natural abundance stable N isotopic composition of litter and soil organic matter to indicate contributions of ECM fungi to ecosystem N cycling.</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>We found that the stable N isotopic composition of leaf litter correlated with a shift in fungal community composition between control and N addition plots. N addition did not affect ECM:SAP fungal ratios or ECM community composition, but decreased the relative abundance of <i>Cortinarius</i>, which are peroxidase-producing ECM fungi.</p><h3 data-test=\"abstract-sub-heading\">Conclusions</h3><p>We did not find evidence that interguild competition or specific ECM functional traits drove conservative N cycling beneath ECM trees. This suggests that tree-scale N limitation may be partially mediated by ecosystem-scale N availability that is distinct in tropical rainforest compared to temperate and boreal forests.\n</p>","PeriodicalId":20223,"journal":{"name":"Plant and Soil","volume":"49 1","pages":""},"PeriodicalIF":3.9000,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Plant and Soil","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1007/s11104-025-07327-4","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRONOMY","Score":null,"Total":0}

引用次数: 0

Abstract

Background and aims

Interactions among ectomycorrhizal (ECM) trees, fungal communities and ecosystem-scale N availability can drive carbon (C) and nitrogen (N) cycling at the tree scale, but these mechanisms have largely been tested in N-limited ecosystems. We investigated the role of ECM and saprotrophic (SAP) fungal communities in suppressing inorganic N cycling beneath ECM trees in a tropical rainforest where biotic and abiotic factors can drive rapid N cycling at the ecosystem scale. Based on knowledge from temperate and boreal forests, we expected to observe a decrease in ECM:SAP fungal ratios and a shift in the ECM fungal community composition with increasing inorganic N availability.

Methods

We quantified fungal community metrics and soil chemical properties in a long-term N addition experiment located in a lower montane tropical rainforest. We measured the natural abundance stable N isotopic composition of litter and soil organic matter to indicate contributions of ECM fungi to ecosystem N cycling.

Results

We found that the stable N isotopic composition of leaf litter correlated with a shift in fungal community composition between control and N addition plots. N addition did not affect ECM:SAP fungal ratios or ECM community composition, but decreased the relative abundance of Cortinarius, which are peroxidase-producing ECM fungi.

Conclusions

We did not find evidence that interguild competition or specific ECM functional traits drove conservative N cycling beneath ECM trees. This suggests that tree-scale N limitation may be partially mediated by ecosystem-scale N availability that is distinct in tropical rainforest compared to temperate and boreal forests.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.