Nitrogen addition enhances stable soil carbon accumulation during ectomycorrhizal hyphae decomposition

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2024-10-17 DOI:10.1007/s11104-024-07004-y

Wentong Gao, Qitong Wang, Na Li, Ruihong Wang, Xinjun Zhang, Huajun Yin

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引用次数: 0

Abstract

Aims

Ectomycorrhizal fungi are pivotal drivers in storing carbon (C) in soil. Yet, whether and how ectomycorrhizal hyphae turnover controls soil organic carbon (SOC) accumulation under nitrogen (N) deposition remains unknown.

Methods

We quantified the responses of SOC and its physical fractions (particulate organic carbon, POC and mineral-associated organic carbon, MAOC) regulated by ectomycorrhizal hyphae decomposition to chronic N addition (25 kg N ha⁻¹ yr⁻¹, 50 kg N ha⁻¹ yr⁻¹). We also explored the microbial necromass C (i.e. amino sugar) contributions SOC accumulation mediated by ectomycorrhizal hyphae decomposition under N addition.

Results

Our results showed that the ectomycorrhizal hyphae decomposition promoted the SOC sequestration dominated by MAOC accrual, and this positive effect was enhanced under N addition. Furthermore, the effects of N addition on stable SOC fraction accumulation during ectomycorrhizal hyphae decomposition was mainly attributed to the increase of microbial necromass C and the enhancement of mineral protection for SOC.

Conclusions

Our results highlight the importance of ectomycorrhizal hyphae decomposition in regulating stable SOC accumulation under N deposition. Collectively, our findings provide direct evidence for the significant role of ectomycorrhizal hyphae turnover on soil C dynamics, and contribute valuable insights into ectomycorrhizal hyphae turnover and associated soil C feedback under atmospheric N deposition.

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外生菌根菌丝分解过程中的氮添加可促进稳定的土壤碳积累

目的外生菌根真菌是土壤中碳（C）储存的关键驱动力。方法我们量化了外生菌根菌丝分解所调节的土壤有机碳（SOC）及其物理组分（颗粒有机碳，POC和矿物相关有机碳，MAOC）对长期氮添加（25 kg N ha-1 yr-1，50 kg N ha-1 yr-1）的响应。结果我们的研究结果表明，外生菌根菌丝分解促进了以 MAOC 累积为主的 SOC 固碳，这种积极作用在氮添加条件下得到了加强。此外，在外生菌根菌丝分解过程中，氮添加对稳定 SOC 部分积累的影响主要归因于微生物坏死物质 C 的增加和对 SOC 矿质保护的增强。总之，我们的研究结果为外生菌根菌丝的更替对土壤碳动态的重要作用提供了直接证据，并为研究大气氮沉降条件下外生菌根菌丝的更替及相关土壤碳反馈提供了有价值的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.