Contrasting Exogenous and Endogenous Soil Microbial Carbon Use Efficiencies Under Global Changes

IF 6.3 1区环境科学与生态学 Q1 ECOLOGY

Global Ecology and Biogeography Pub Date : 2025-03-31 DOI:10.1111/geb.70027

Xiaodong Sun, Chenyang Zhang, Zhenghu Zhou, Yakov Kuzyakov, Yiqi Luo, Xuhui Wang, Xiaobo Qin, Bin Wang, Yue Li, Minggang Xu, Andong Cai

{"title":"Contrasting Exogenous and Endogenous Soil Microbial Carbon Use Efficiencies Under Global Changes","authors":"Xiaodong Sun, Chenyang Zhang, Zhenghu Zhou, Yakov Kuzyakov, Yiqi Luo, Xuhui Wang, Xiaobo Qin, Bin Wang, Yue Li, Minggang Xu, Andong Cai","doi":"10.1111/geb.70027","DOIUrl":null,"url":null,"abstract":"<div>\n \n \n <section>\n \n <h3> Aim</h3>\n \n <p>Microbial carbon use efficiency (CUE) is one of the key indicators for the formation and release of soil carbon. CUE can be divided into exogenous CUE (CUE<sub>ex</sub>, efficiency in using external carbon sources measured by e.g. <sup>13</sup>C or <sup>14</sup>C labeling) and endogenous CUE (CUE<sub>en</sub>, efficiency in using internal carbon sources measured by <sup>18</sup>O labeling). Global changes strongly influence CUE, which response depends on the carbon source. However, the effect size and drivers of CUE<sub>ex</sub> and CUE<sub>en</sub> responses to global changes remain unclear, leading to large uncertainties when forecasting terrestrial carbon cycling. We aimed to quantify the magnitude and direction of microbial CUE<sub>ex</sub> and CUE<sub>en</sub> responses to global changes.</p>\n </section>\n \n <section>\n \n <h3> Location</h3>\n \n <p>Global.</p>\n </section>\n \n <section>\n \n <h3> Time Period</h3>\n \n <p>2011–2024.</p>\n </section>\n \n <section>\n \n <h3> Major Taxa Studied</h3>\n \n <p>Soil microorganisms.</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>Database containing 213 paired microbial CUE<sub>ex</sub> and 155 paired microbial CUE<sub>en</sub> data was integrated and meta-analysed to assess the impacts of global change factors on microbial CUE. Additional information gathered encompassed latitude, longitude, climate, plant properties, soil properties, microbial properties and experimental conditions.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>We found that CUE<sub>ex</sub> decreased with absolute latitude, while CUE<sub>en</sub> showed the opposite trend. Warming reduced CUE<sub>ex</sub> and CUE<sub>en</sub> by 3.6% and 16.5%, respectively. Drought increased CUE<sub>ex</sub> by 7.9%, but decreased CUE<sub>en</sub> by 14.3%. Nutrient inputs consistently decreased CUE<sub>ex</sub> by 5.0%–17.1%, while nitrogen and nitrogen combined with phosphorus and potassium inputs increased CUE<sub>en</sub> by 25.5% and 43.1%, respectively. Aridity index, soil pH and cation exchange capacity were the main factors influencing microbial CUE<sub>ex</sub>. In contrast, microbial respiration and growth rates, followed by microbial biomass, were the major predictors of microbial CUE<sub>en</sub>.</p>\n </section>\n \n <section>\n \n <h3> Main Conclusions</h3>\n \n <p>Biogeochemical models should account for the opposite spatial patterns of microbial CUE<sub>ex</sub> and CUE<sub>en</sub>, as well as their respective specific drivers under global changes, to accurately predict microbial responses to various carbon sources.</p>\n </section>\n </div>","PeriodicalId":176,"journal":{"name":"Global Ecology and Biogeography","volume":"34 4","pages":""},"PeriodicalIF":6.3000,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/geb.70027","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Global Ecology and Biogeography","FirstCategoryId":"93","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/geb.70027","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ECOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

Aim

Microbial carbon use efficiency (CUE) is one of the key indicators for the formation and release of soil carbon. CUE can be divided into exogenous CUE (CUE_ex, efficiency in using external carbon sources measured by e.g. ¹³C or ¹⁴C labeling) and endogenous CUE (CUE_en, efficiency in using internal carbon sources measured by ¹⁸O labeling). Global changes strongly influence CUE, which response depends on the carbon source. However, the effect size and drivers of CUE_ex and CUE_en responses to global changes remain unclear, leading to large uncertainties when forecasting terrestrial carbon cycling. We aimed to quantify the magnitude and direction of microbial CUE_ex and CUE_en responses to global changes.

Location

Global.

Time Period

2011–2024.

Major Taxa Studied

Soil microorganisms.

Methods

Database containing 213 paired microbial CUE_ex and 155 paired microbial CUE_en data was integrated and meta-analysed to assess the impacts of global change factors on microbial CUE. Additional information gathered encompassed latitude, longitude, climate, plant properties, soil properties, microbial properties and experimental conditions.

Results

We found that CUE_ex decreased with absolute latitude, while CUE_en showed the opposite trend. Warming reduced CUE_ex and CUE_en by 3.6% and 16.5%, respectively. Drought increased CUE_ex by 7.9%, but decreased CUE_en by 14.3%. Nutrient inputs consistently decreased CUE_ex by 5.0%–17.1%, while nitrogen and nitrogen combined with phosphorus and potassium inputs increased CUE_en by 25.5% and 43.1%, respectively. Aridity index, soil pH and cation exchange capacity were the main factors influencing microbial CUE_ex. In contrast, microbial respiration and growth rates, followed by microbial biomass, were the major predictors of microbial CUE_en.

Main Conclusions

Biogeochemical models should account for the opposite spatial patterns of microbial CUE_ex and CUE_en, as well as their respective specific drivers under global changes, to accurately predict microbial responses to various carbon sources.

Abstract Image

查看原文本刊更多论文

全球变化下外源和内源土壤微生物碳利用效率对比

微生物碳利用效率（CUE）是土壤碳形成和释放的关键指标之一。CUE可分为外源性CUE （CUEex，利用外部碳源的效率，如13C或14C标记）和内源性CUE （CUEen，利用内部碳源的效率，如18O标记）。全球变化强烈影响CUE，其响应依赖于碳源。然而，CUEex和CUEen对全球变化响应的效应大小和驱动因素仍不清楚，这导致在预测陆地碳循环时存在很大的不确定性。我们的目的是量化微生物CUEex和CUEen对全球变化的响应的幅度和方向。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Global Ecology and Biogeography 环境科学-生态学

CiteScore

12.10

自引率

3.10%

发文量

170

审稿时长

3 months

期刊介绍： Global Ecology and Biogeography (GEB) welcomes papers that investigate broad-scale (in space, time and/or taxonomy), general patterns in the organization of ecological systems and assemblages, and the processes that underlie them. In particular, GEB welcomes studies that use macroecological methods, comparative analyses, meta-analyses, reviews, spatial analyses and modelling to arrive at general, conceptual conclusions. Studies in GEB need not be global in spatial extent, but the conclusions and implications of the study must be relevant to ecologists and biogeographers globally, rather than being limited to local areas, or specific taxa. Similarly, GEB is not limited to spatial studies; we are equally interested in the general patterns of nature through time, among taxa (e.g., body sizes, dispersal abilities), through the course of evolution, etc. Further, GEB welcomes papers that investigate general impacts of human activities on ecological systems in accordance with the above criteria.