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Soil organic carbon variation is associated with soil chemical conditions under long-term nitrogen enrichment in a temperate forest.

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Title: Soil organic carbon variation is associated with soil chemical conditions under long-term nitrogen enrichment in a temperate forest.
Authors: Zhou, Mingxin1 (AUTHOR), Li, Yibo2 (AUTHOR) liyibo8586@163.com, Wen, He1 (AUTHOR), Wang, Lei1 (AUTHOR), Zhang, Die1 (AUTHOR)
Source: Canadian Journal of Forest Research. 6/15/2026, Vol. 56, p1-12. 12p.
Subject Terms: *Soil chemistry, *Nitrogen, *Mycorrhizal plants, *Carbon in soils, *Soil acidity, *Temperate forests, *Nitrogen fertilizers, Plant root morphology
Abstract: Soil organic carbon (SOC) accumulation is influenced by multiple interacting processes, yet how long-term nitrogen (N) enrichment alters their relative importance and whether species-level trait divergence leads to differentiated SOC-regulatory pathways remain unclear. A long-term N-addition experiment was conducted in a temperate mixed forest. We quantified soil chemical and structural properties together with species-specific fine-root and mycorrhizal morphological traits. N enrichment significantly altered soil chemical conditions, with soil pH decreasing (6.18–5.00) and NO3−–N increasing (12.11–36.89 µg g−1), while SOC also increased across treatments (22.88–27.46 g kg−1). Although soil aggregate stability increased under N addition, multivariate and random forest analyses identified soil pH and NO3−–N as the dominant predictors of SOC, whereas aggregate indices and biotic traits contributed secondarily. Mycorrhizal morphological traits declined with increasing N inputs, and fine-root traits varied among species, root orders, and treatments; however, these biotic differences did not improve SOC prediction beyond plot-scale soil chemical variables, indicating that SOC variation under long-term N enrichment was associated mainly with soil chemical conditions. [ABSTRACT FROM AUTHOR]
Copyright of Canadian Journal of Forest Research is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Soil organic carbon variation is associated with soil chemical conditions under long-term nitrogen enrichment in a temperate forest.
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  Data: <searchLink fieldCode="AR" term="%22Zhou%2C+Mingxin%22">Zhou, Mingxin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Yibo%22">Li, Yibo</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> liyibo8586@163.com</i><br /><searchLink fieldCode="AR" term="%22Wen%2C+He%22">Wen, He</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Lei%22">Wang, Lei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Die%22">Zhang, Die</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Canadian+Journal+of+Forest+Research%22">Canadian Journal of Forest Research</searchLink>. 6/15/2026, Vol. 56, p1-12. 12p.
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  Data: *<searchLink fieldCode="DE" term="%22Soil+chemistry%22">Soil chemistry</searchLink><br />*<searchLink fieldCode="DE" term="%22Nitrogen%22">Nitrogen</searchLink><br />*<searchLink fieldCode="DE" term="%22Mycorrhizal+plants%22">Mycorrhizal plants</searchLink><br />*<searchLink fieldCode="DE" term="%22Carbon+in+soils%22">Carbon in soils</searchLink><br />*<searchLink fieldCode="DE" term="%22Soil+acidity%22">Soil acidity</searchLink><br />*<searchLink fieldCode="DE" term="%22Temperate+forests%22">Temperate forests</searchLink><br />*<searchLink fieldCode="DE" term="%22Nitrogen+fertilizers%22">Nitrogen fertilizers</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+root+morphology%22">Plant root morphology</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Soil organic carbon (SOC) accumulation is influenced by multiple interacting processes, yet how long-term nitrogen (N) enrichment alters their relative importance and whether species-level trait divergence leads to differentiated SOC-regulatory pathways remain unclear. A long-term N-addition experiment was conducted in a temperate mixed forest. We quantified soil chemical and structural properties together with species-specific fine-root and mycorrhizal morphological traits. N enrichment significantly altered soil chemical conditions, with soil pH decreasing (6.18–5.00) and NO3−–N increasing (12.11–36.89 µg g−1), while SOC also increased across treatments (22.88–27.46 g kg−1). Although soil aggregate stability increased under N addition, multivariate and random forest analyses identified soil pH and NO3−–N as the dominant predictors of SOC, whereas aggregate indices and biotic traits contributed secondarily. Mycorrhizal morphological traits declined with increasing N inputs, and fine-root traits varied among species, root orders, and treatments; however, these biotic differences did not improve SOC prediction beyond plot-scale soil chemical variables, indicating that SOC variation under long-term N enrichment was associated mainly with soil chemical conditions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Canadian Journal of Forest Research is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1139/cjfr-2026-0047
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 12
        StartPage: 1
    Subjects:
      – SubjectFull: Soil chemistry
        Type: general
      – SubjectFull: Nitrogen
        Type: general
      – SubjectFull: Mycorrhizal plants
        Type: general
      – SubjectFull: Carbon in soils
        Type: general
      – SubjectFull: Soil acidity
        Type: general
      – SubjectFull: Temperate forests
        Type: general
      – SubjectFull: Nitrogen fertilizers
        Type: general
      – SubjectFull: Plant root morphology
        Type: general
    Titles:
      – TitleFull: Soil organic carbon variation is associated with soil chemical conditions under long-term nitrogen enrichment in a temperate forest.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Zhou, Mingxin
      – PersonEntity:
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            NameFull: Li, Yibo
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            NameFull: Wen, He
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            NameFull: Wang, Lei
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            NameFull: Zhang, Die
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            – D: 15
              M: 06
              Text: 6/15/2026
              Type: published
              Y: 2026
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              Value: 56
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            – TitleFull: Canadian Journal of Forest Research
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