近日，中国科学技术大学刘晓东团队揭示了东洞庭湖湿地不同土地利用类型土壤剖面碳分布特征及影响因素。这一研究成果于2026年5月11日发表在《地球化学学报》杂志上。

湿地生态系统在调节环境变化，特别是在土壤有机碳（SOC）固存方面发挥着至关重要的作用。然而，关于不同土地利用方式下土壤有机碳组分沿土壤深度剖面的分布及其影响因素的研究仍然有限。

研究组从东洞庭湖湿地采集了代表不同土地利用类型的34个剖面的314个土壤样品，并对SOC组分及其稳定性进行了一系列分析。结果表明，SOC含量从表层到底层逐渐降低，芦苇湿地、旱地和稻田的平均值分别为7.44、6.43和8.29 g kg^-1。土地利用类型显著影响顽固性有机碳（ROC）的含量，其中芦苇湿地的ROC占比最高（69.99%）。该类型湿地还表现出较高的团聚体稳定性和0–100 cm土层内显著的SOC储量，这些特征对提高SOC含量和碳固存潜力具有积极作用。

预测模型表明，SOC组分主要受总氮含量和土壤容重的控制。在稻田中，相对含水量和黏粒含量对SOC组分的影响更为重要。土地利用类型还影响SOC储量，芦苇湿地、旱地和稻田（0–100 cm）的SOC储量分别为9.55、8.82和8.71 kg C m^-2。这些发现增进了对土地利用方式如何影响湿地SOC组分分布的认识，为湿地生态系统土壤碳固存提供了科学依据。

附：英文原文

Title: Carbon distribution characteristics and influencing factors in soil profiles under different land use types in the East Dongting Lake Wetlands

Author: Wang, Siyu, Xi, Xianglong, Tu, Xihai, Su, Guoshan, Wang, Zhuoyue, Zhou, Renjun, Zhao, Zhuang, Liu, Xiaodong

Issue&Volume: 2026-05-11

Abstract: Wetland ecosystems play a crucial role in regulating environmental changes, particularly in soil organic carbon (SOC) sequestration. However, research on the distribution of SOC components along the soil depth profile and their influencing factors under different land use types remains limited. In this study, we collected 314 soil samples from 34 profiles in the East Dongting Lake Wetlands, representing different land use types, and conducted a series of analyses on SOC components and stability. The results showed that SOC content gradually decreased from the surface to the bottom layer, with average values of 7.44, 6.43, and 8.29 g kg1 in reed wetlands, uplands, and paddy fields, respectively. Land use type significantly affected the level of recalcitrant organic carbon (ROC), with the highest proportion observed in reed wetlands (69.99%). This type of wetland also exhibits high aggregate stability and substantial SOC stocks within the 0–100 cm soil depth, and these characteristics exert a positive effect on enhancing SOC content and carbon sequestration potential. The predictive model indicated that SOC components were primarily governed by total nitrogen content and soil bulk density. In paddy fields, relative water content and clay content played more important roles in influencing SOC components. Land use type also influenced SOC storage, with values of 9.55, 8.82, and 8.71 kg C m2 (0–100 cm) in reed wetlands, uplands, and paddy fields, respectively. These findings advance the understanding of how land use types impact SOC component distribution in wetlands, contributing to the scientific basis for soil carbon sequestration in wetland ecosystems.

DOI: 10.1007/s11631-026-00876-0

Source: https://link.springer.com/article/10.1007/s11631-026-00876-0