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<p>Soil organic carbon (SOC) plays a vital role in ensuring food security and mitigating climate change. However, the Northeast China Plain has experienced significant SOC depletion in recent decades, necessitating comprehensive monitoring. To address this, a geochemical monitoring network was established across approximately 2.6 × 10<sup>5</sup> km<sup>2</sup>, with surface soil samples collected in 2005 (n = 1910) and 2018 (n = 1920). SOC spatial distribution was modeled using Empirical Bayesian Kriging. This study quantified the spatiotemporal changes in SOC density (SOCD) and stock (SOCS) and assessed the effects of land-use change on SOC dynamics. Results showed that: (1) From 2005 to 2018, SOCD and SOCS increased by 0.16 kg&#xa0;C&#xa0;m<sup>−2</sup> (5.18%) and 49.79 Tg (5.84%), respectively. (2) Spatial analysis revealed an increase in SOCD in 57.91% of the monitored area, with 18.07% of area exhibiting an increase exceeding 20%. (3) Among land-use types, paddy land demonstrated the strongest carbon sequestration potential, with SOCD increased from 3.69 to 4.26 kg&#xa0;C&#xa0;m<sup>−2</sup> (15.45%). Notably, areas with stable land use types contributed 73.05% of the total SOCS increase, indicating that land-use change was not the primary driver of SOCS accumulation. This study provides valuable insights into the spatiotemporal dynamics of SOC in the Northeast China Plain, offering critical scientific evidence for developing targeted soil management strategies to enhance carbon sequestration capacity in agricultural ecosystems.</p>

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Dynamics of soil organic carbon density and stocks in Northeast China Plain from 2005 to 2018: spatiotemporal patterns and land use impacts

  • 期刊论文

  • 发表日期：

    2025年7月22日

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  • Honghong Ma,
  • Zheng Yang,
  • Ke Yang,
  • Kuo Li,
  • Fei Guo,
  • Shiqi Tang,
  • Zhongfang Yang,
  • Xueqi Xia,
  • Hangxin Cheng,
  • Min Peng

摘要

Soil organic carbon (SOC) plays a vital role in ensuring food security and mitigating climate change. However, the Northeast China Plain has experienced significant SOC depletion in recent decades, necessitating comprehensive monitoring. To address this, a geochemical monitoring network was established across approximately 2.6 × 105 km2, with surface soil samples collected in 2005 (n = 1910) and 2018 (n = 1920). SOC spatial distribution was modeled using Empirical Bayesian Kriging. This study quantified the spatiotemporal changes in SOC density (SOCD) and stock (SOCS) and assessed the effects of land-use change on SOC dynamics. Results showed that: (1) From 2005 to 2018, SOCD and SOCS increased by 0.16 kg C m−2 (5.18%) and 49.79 Tg (5.84%), respectively. (2) Spatial analysis revealed an increase in SOCD in 57.91% of the monitored area, with 18.07% of area exhibiting an increase exceeding 20%. (3) Among land-use types, paddy land demonstrated the strongest carbon sequestration potential, with SOCD increased from 3.69 to 4.26 kg C m−2 (15.45%). Notably, areas with stable land use types contributed 73.05% of the total SOCS increase, indicating that land-use change was not the primary driver of SOCS accumulation. This study provides valuable insights into the spatiotemporal dynamics of SOC in the Northeast China Plain, offering critical scientific evidence for developing targeted soil management strategies to enhance carbon sequestration capacity in agricultural ecosystems.