Journal of Integrative Agriculture ›› 2026, Vol. 25 ›› Issue (2): 540-552.DOI: 10.1016/j.jia.2025.09.030

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不同土壤类型土地利用方式对土壤有机碳的影响

  

  • 收稿日期:2025-04-03 修回日期:2025-09-26 接受日期:2025-08-29 出版日期:2026-02-20 发布日期:2026-01-06

Effects of land use type on soil organic carbon in different soil types

Shunjie Zhu1, 5*, Liangliang Xu1*, Chengzhong He1, 2*, Yongxing Guo3, Changqun Duan1, Xin Jiang2, Shiyu Li1#, Hailong Yu4#   

  1. 1 Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments/School of Ecology and Environmental Science, Yunnan University, Kunming 650500, China

    2 Kunming General Survey of Natural Resources Center, China Geological Survey, Kunming 650100, China

    3 School of Mathematics, Hangzhou Normal University, Hangzhou 311121, China

    4 Command Center of Natural Resources Comprehensive Survey, China Geological Survey, Beijing 100055, China

    5 Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650500, China

  • Received:2025-04-03 Revised:2025-09-26 Accepted:2025-08-29 Online:2026-02-20 Published:2026-01-06
  • About author:#Correspondence Shiyu Li, E-mail: lisy@ynu.edu.cn; Hailong Yu, E-mail: yhailong@mail.cgs.gov.cn * These authors contributed equally to this study.
  • Supported by:

    This research was funded by the Yunnan Provincial Key Programs for Basic Research Project, China (202301AS070087), the Yunnan Provincial R & D Program, China (202405AF140014 and 202302AO370015), and the National Natural Science Foundation of China (42307058).

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摘要：

土壤有机碳动态对生态系统尤其是农业生态系统碳源-汇平衡起决定性作用。然而，目前尚不清楚哪种土地利用类型优化了不同土壤类型的农田碳储存，确定促进碳积累的土地管理措施对于减少农业碳排放和加强碳汇至关重要。本研究以云南东部亚热带高原2132个样点为研究对象，分析了5种土地利用方式（旱地、灌溉地、林地、草地、种植园）5种土壤类型（红壤、黄壤、黄棕壤、棕壤、紫色土）0-20 cm表层土壤的有机碳变化特征。研究土壤有机碳与土壤因子（26种元素）的关系，确定土壤有机碳的影响因素。研究区平均SOC含量为27.78 g kg-1，空间异质性表现为东北地区高西南地区低。棕壤有机碳含量最高（P<0.05），其次是黄棕壤，随后依次为红壤、黄壤、紫色土。灌溉显著提高了土壤有机碳储量，特别是在棕壤中，灌溉地的有机碳含量分别是林地、草地和旱地的2.2倍、2.4倍和1.6倍。在紫色土、黄壤和黄棕壤中也出现了类似的灌溉效益，表明水分限制是土壤有机碳的主要限制因素。土壤有机碳与氮（N）、硫（S）、硒（Se）呈显著正相关。施氮具有增强土壤有机碳固存和促进作物硒富集的双重效益，对特色农业具有潜在的支持作用。尽管土地利用方式对土壤有机碳的影响因土壤类型而异（P>0.05），但灌溉始终是碳增汇的最佳管理方式。这些结果表明，有针对性的水分管理可以有效减少水分受限的亚热带高原地区农田碳排放。策略性施氮为土壤肥力和硒生物强化提供了协同效益，为类似生态区域的气候智能型农业提供了切实可行的途径。

Abstract:


Soil organic carbon (SOC) dynamics significantly influence ecosystem carbon source-sink balance, particularly in agroecosystems.  However, uncertainty remains regarding optimal land use types for maximizing farmland carbon storage across different soil types, and identifying effective land management practices for enhanced carbon accumulation is essential for reducing agricultural emissions and strengthening carbon sinks.  This study examined SOC variations in eastern Yunnan’s subtropical highlands (2,132 sites), analyzing topsoil (0–20 cm) across five land uses (dryland, irrigated land, forestland, grassland and plantation) of five soil types (red, yellow, yellow-brown, brown, purple).  The investigation explored relationships between SOC and edaphic factors (26 elements) to determine SOC influencing factors.  The study area demonstrated a mean SOC content of 27.78 g kg–1, with distinct spatial heterogeneity characterized by lower values in the southwestern sector and higher concentrations in the northeastern region.  Brown soils displayed the highest SOC content (P<0.05), followed by yellow-brown then red, yellow, and purple soils.  Irrigation significantly enhanced SOC storage, particularly in brown soils where irrigated land contained 2.2-, 2.4-, and 1.6-times higher SOC than forestland, grassland, and dryland, respectively.  Similar irrigation benefits occurred in purple, yellow, and yellow-brown soils, indicating moisture limitation as the primary SOC constraint.  Notably, SOC exhibited strong positive correlations with nitrogen, sulfur, and selenium.  Nitrogen fertilization demonstrated dual benefits: enhancing SOC sequestration and promoting Se enrichment in crops, potentially supporting specialty agriculture.  Although land use impacts on SOC varied across soil types (P>0.05), irrigation consistently emerged as the optimal management for carbon sink enhancement.  These findings suggest that targeted water management could effectively reduce farmland carbon emissions in moisture-limited subtropical highlands.  Strategic nitrogen application offers co-benefits for soil fertility and selenium biofortification, providing practical pathways for climate-smart agriculture in similar ecoregions.


Key words: soil organic carbon , soil type , land use type , carbon storage , agroecosystems