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土壤碳库通过有机碳固存与分解和无机碳沉淀与重组维持动态平衡，主导干旱半干旱区陆地碳循环。在气候干旱、养分贫乏的环境中，无机碳是碳库主体，而对有机碳向无机碳的转化缺乏认识。以内蒙古满连沟小流域为对象，结合野外采样与碳稳定同位素分析，揭示黄土区典型流域土壤有机碳-无机碳转化机制及驱动因素。研究结果表明：人工林地和草地均显著提高有机碳含量，林地最高，且无机碳向深层富集，而沟壁裸地表层无机碳含量最高。沟壁裸地土壤呼吸释放CO2量最大，有机碳向无机碳转化强于修复区，但整体转移量较低，仅0.039 g/kg。颗粒有机碳主导草地修复区的有机碳-无机碳转化，林地则受土壤含水量相对驱动。
Abstract：The soil carbon pool in arid and semi-arid regions maintains dynamic balance to dominate the carbon cycle through the sequestration and decomposition of soil organic carbon(SOC) and the precipitation and reformation of soil inorganic carbon(SIC). In nutrient-poor drylands, SIC constitutes the dominant fraction, yet the mechanisms underlying SOC-SIC transformation remain poorly understood. In this study, field sampling and carbon stable isotope analysis were conducted in the Manliangou watershed, Inner Mongolia, the transformation mechanisms of soil organic-inorganic carbon and their driving factors have been revealed. Results show that artificial forests and grasslands significantly enhance SOC content, with the highest levels in the forest land, while SIC can be accumulated in deeper layers; bare gully slopes exhibit the highest surface SIC content. Soil respiration on bare gully slopes releases the largest amount of CO2, leading to stronger SOC-SIC transformation than that in restored areas, although the overall transfer amount is relatively low(0.039 g/kg). Particulate organic carbon dominates SOC-SIC transformation in grasslands, while woodland is driven by soil moisture.
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基本信息:
DOI：10.16239/j.cnki.0468-155x.2026.03.003
中图分类号:X144;S153.6
引用信息:
[1]张健先,张铁钢,张永娥,等.黄土区典型流域土壤有机碳-无机碳转化及驱动因素[J].泥沙研究,2026,51(03):16-23.DOI:10.16239/j.cnki.0468-155x.2026.03.003.
基金信息:
国家电网有限公司总部管理科技项目(5200~202055134A-0-0-00 and SGTYHT/19-JS-215)
2025-08-27
2025
2025-12-09
2026-04-21
2026
1
2026-05-20
2026-05-20
2026-05-20