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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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Bibliographic Details
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]
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Database:	GreenFILE

Description
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]
ISSN:	00455067
DOI:	10.1139/cjfr-2026-0047