Nitrogen addition alters the relative importance of roots and mycorrhizal hyphae in regulating soil organic carbon accumulation in a karst forest

Yuan, Yuanshuang; Yin, Yicong; Adamczyk, Bartosz; Liang, Di; Gu, Dapeng; Xia, Guowei; Zhang, Jianli; Zhang, Ziliang

doi:10.1016/j.soilbio.2024.109471

Title: Nitrogen addition alters the relative importance of roots and mycorrhizal hyphae in regulating soil organic carbon accumulation in a karst forest

Journal Article · 08 May 2024 · Soil Biology and Biochemistry

DOI: https://doi.org/10.1016/j.soilbio.2024.109471 · OSTI ID:2349587

^[1]; Yin, Yicong ^[1];

^[2];

^[3]; Gu, Dapeng ^[1]; Xia, Guowei ^[1];

^[1]; Zhang, Ziliang ^[4]

Guizhou Minzu University, Guiyang (China)
Natural Resources Institute Finland, Helsinki (Finland)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Northwestern Polytechnical University, Xi'an (China)

Plant belowground carbon (C) inputs from roots and associated mycorrhizal hyphae are increasingly recognized as critical drivers impacting soil organic C (SOC) pool. However, whether roots and mycorrhizal hyphae differentially regulate SOC formation and accumulation under elevated nitrogen (N) deposition remains to be addressed. Using an ingrowth-core technique, the relative contributions of roots and mycorrhizal hyphae to SOC accumulation were distinguished and quantified in a karst forest receiving three levels of N additions (control (0 kg N ha^-1 yr^-1), low N (150 kg N ha^-1 yr^-1) and high N (300 kg N ha^-1 yr^-1)). Here our results showed that N addition stimulated SOC accumulation (indicated by the increase of both bulk SOC and mineral associated organic C fraction) influenced by both roots and hyphae, especially for higher N doses. Moreover, N addition increased the contribution of the root effect relative to the hyphal effect in the SOC accrual. The correlation analysis showed that, for the hyphal effect, the change in SOC content was solely and positively correlated with the change in protective mineral phases of SOC, but not with the microbial necromass. In contrast, for the root effect, the change in SOC content was significantly and positively correlated with the changes in both soil microbial C pump efficacy and protective mineral phases of SOC. These results suggest that roots and mycorrhizal hyphae may influence the accumulation of microbial necromass and the formation of mineral-organic associations in a different magnitude under enhanced N supply. These findings advance our understanding of the root-mycorrhizal interactions in mediating SOC dynamics in forests under future N deposition scenarios.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Natural Science Foundation of China; Guizhou Provincial Science and Technology Projects; Guizhou Minzu University

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2349587

Report Number(s):: LLNL--JRNL-863465; 1096601

Journal Information:: Soil Biology and Biochemistry, Journal Name: Soil Biology and Biochemistry Journal Issue: N/A Vol. 195; ISSN 0038-0717

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
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Title: Nitrogen addition alters the relative importance of roots and mycorrhizal hyphae in regulating soil organic carbon accumulation in a karst forest

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