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Significant role of microbial nitrogen use efficiency in regulating long-term soil carbon and nitrogen stoichiometry.

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Title: Significant role of microbial nitrogen use efficiency in regulating long-term soil carbon and nitrogen stoichiometry.
Authors: Li, Wanyu1,2 (AUTHOR) liwanyu@whu.edu.cn, Wang, Gangsheng1,2 (AUTHOR) wanggs@whu.edu.cn, Xiang, Daifeng1,2 (AUTHOR) xiangdf@whu.edu.cn, Qi, Shanshan1,2 (AUTHOR) qiss22b@whu.edu.cn, Tian, Jing1,2 (AUTHOR) tianjing97@whu.edu.cn, Lv, Zehao1,2 (AUTHOR) 2021202060003@whu.edu.cn
Source: Biology & Fertility of Soils. May2026, Vol. 62 Issue 4, p469-484. 16p.
Subject Terms: *Microbial physiology, *Forest soils, *Soil ecology, *Carbon metabolism, *Tropical forests
Abstract: Microbes play a major role in soil biogeochemistry, yet it remains unclear how microbial physiology, particularly microbial nitrogen (N) use efficiency (NUE), regulates the soil C/N ratio to maintain long-term stoichiometric stability. Here, we refined the definition and quantification of microbial NUE in the latest C-N coupled Microbial-ENzyme Decomposition (MEND) model and validated it against field experimental data from subtropical broadleaf and pine forests. Our results show that microbial anabolism, reflected in high C use efficiency (CUE) and NUE, contributes to the stabilization of the soil C/N ratio. Long-term simulations, based on a calibration strategy combining experimental calibration with independent post-experiment evaluation, revealed insignificant difference in microbial CUE between broadleaf and pine forests, but a notable higher NUE in the broadleaf forest (0.64) than that in the pine forest (0.38). Soil C/N ratio decreased as CUE and NUE increased, with a stronger association for NUE. Additionally, following a 33% and 21% increase in litterfall C/N ratios in the broadleaf and pine forests, microbial NUE would need to rise by 10.5% and 11.0%, respectively, to maintain the soil C/N ratio, while microbial CUE was held constant. These findings highlight microbial NUE as a key control on soil C/N stability in subtropical forests, with implications for forest management under global change as litter quality shifts. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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An: 192963944
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Significant role of microbial nitrogen use efficiency in regulating long-term soil carbon and nitrogen stoichiometry.
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Wanyu%22">Li, Wanyu</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> liwanyu@whu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Gangsheng%22">Wang, Gangsheng</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> wanggs@whu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Xiang%2C+Daifeng%22">Xiang, Daifeng</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> xiangdf@whu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Qi%2C+Shanshan%22">Qi, Shanshan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> qiss22b@whu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Tian%2C+Jing%22">Tian, Jing</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> tianjing97@whu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Lv%2C+Zehao%22">Lv, Zehao</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> 2021202060003@whu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Biology+%26+Fertility+of+Soils%22">Biology & Fertility of Soils</searchLink>. May2026, Vol. 62 Issue 4, p469-484. 16p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Microbial+physiology%22">Microbial physiology</searchLink><br />*<searchLink fieldCode="DE" term="%22Forest+soils%22">Forest soils</searchLink><br />*<searchLink fieldCode="DE" term="%22Soil+ecology%22">Soil ecology</searchLink><br />*<searchLink fieldCode="DE" term="%22Carbon+metabolism%22">Carbon metabolism</searchLink><br />*<searchLink fieldCode="DE" term="%22Tropical+forests%22">Tropical forests</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Microbes play a major role in soil biogeochemistry, yet it remains unclear how microbial physiology, particularly microbial nitrogen (N) use efficiency (NUE), regulates the soil C/N ratio to maintain long-term stoichiometric stability. Here, we refined the definition and quantification of microbial NUE in the latest C-N coupled Microbial-ENzyme Decomposition (MEND) model and validated it against field experimental data from subtropical broadleaf and pine forests. Our results show that microbial anabolism, reflected in high C use efficiency (CUE) and NUE, contributes to the stabilization of the soil C/N ratio. Long-term simulations, based on a calibration strategy combining experimental calibration with independent post-experiment evaluation, revealed insignificant difference in microbial CUE between broadleaf and pine forests, but a notable higher NUE in the broadleaf forest (0.64) than that in the pine forest (0.38). Soil C/N ratio decreased as CUE and NUE increased, with a stronger association for NUE. Additionally, following a 33% and 21% increase in litterfall C/N ratios in the broadleaf and pine forests, microbial NUE would need to rise by 10.5% and 11.0%, respectively, to maintain the soil C/N ratio, while microbial CUE was held constant. These findings highlight microbial NUE as a key control on soil C/N stability in subtropical forests, with implications for forest management under global change as litter quality shifts. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1007/s00374-026-01985-x
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 16
        StartPage: 469
    Subjects:
      – SubjectFull: Microbial physiology
        Type: general
      – SubjectFull: Forest soils
        Type: general
      – SubjectFull: Soil ecology
        Type: general
      – SubjectFull: Carbon metabolism
        Type: general
      – SubjectFull: Tropical forests
        Type: general
    Titles:
      – TitleFull: Significant role of microbial nitrogen use efficiency in regulating long-term soil carbon and nitrogen stoichiometry.
        Type: main
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            NameFull: Li, Wanyu
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            NameFull: Wang, Gangsheng
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            NameFull: Xiang, Daifeng
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            NameFull: Qi, Shanshan
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            NameFull: Tian, Jing
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            NameFull: Lv, Zehao
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            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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              Value: 62
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              Value: 4
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            – TitleFull: Biology & Fertility of Soils
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