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草业学报 ›› 2026, Vol. 35 ›› Issue (10): 1-14.DOI: 10.11686/cyxb2025433

• 研究论文 •    

天山北坡草地矿物结合态有机碳的空间分异

司静1,2(), 王瑶1,2, 许仲林1,3,4,5()   

  1. 1.新疆大学生态与环境学院,新疆 乌鲁木齐 830017
    2.中国气象局乌鲁木齐沙漠气象研究所,新疆 乌鲁木齐 830002
    3.新疆精河温带荒漠生态系统教育部野外科学观测研究站,新疆 精河 833300
    4.自然资源部荒漠-绿洲生态监测与修复工程技术创新中心,新疆 乌鲁木齐 830002
    5.新疆大学绿洲生态教育部重点实验室,新疆 乌鲁木齐 830017
  • 收稿日期:2025-10-20 修回日期:2025-12-09 出版日期:2026-10-20 发布日期:2026-09-09
  • 通讯作者: 许仲林
  • 作者简介:E-mail: zlxu@xju.edu.cn
    司静(2000-),女,新疆奎屯人,在读硕士。E-mail: 107552301758@stu.xju.edu.cn
  • 基金资助:
    新疆维吾尔自治区区域协同创新专项(上海合作组织科技伙伴计划及国际科技合作计划)(2023E01006);新疆自然科学基金科技创新人才-青年拔尖项目(2024TSYCCX0004)

Spatial variation of mineral-associated organic carbon in grassland on the northern slopes of the Tianshan Mountains

Jing SI1,2(), Yao WANG1,2, Zhong-lin XU1,3,4,5()   

  1. 1.College of Ecology and Environment,Xinjiang University,Urumqi 830017,China
    2.Institute of Desert Meteorology,China Meteorological Administration,Urumqi 830002,China
    3.Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem,Ministry of Education,Jinghe 833300,China
    4.Technology Innovation Center for Ecological Monitoring and Restoration of Desert-Oasis,Ministry of Natural Resource,Urumqi 830002,China
    5.Key Laboratory of Oasis Ecology,Ministry of Education,Xinjiang University,Urumqi 830017,China
  • Received:2025-10-20 Revised:2025-12-09 Online:2026-10-20 Published:2026-09-09
  • Contact: Zhong-lin XU

摘要:

矿物结合态有机碳(mineral-associated organic carbon, MAOC)是土壤有机碳中较为稳定的重要组分,其含量变化直接影响土壤碳库的组成与长期稳定性,尤其在干旱区草地生态系统中,对碳的长期固存与碳汇功能发挥关键作用。目前,对中亚干旱与半干旱区草地MAOC空间格局及其主控因子的研究尚有不足。本研究以新疆天山北坡草地为对象,从草地类型、土壤剖面及地形-气候-土壤因子3个维度,探讨MAOC的空间分布特征及其驱动机制。结果表明:1)MAOC含量随土层深度增加而降低,不同草地类型间依次为山地草甸>典型草原>荒漠草原;2)相关性分析表明,MAOC含量与气温和土壤pH呈显著负相关关系,而与海拔、坡度、速效磷与全氮含量呈显著正相关关系;3)碳稳定性指数(carbon stability index, CSI)显示,深层土壤CSI值越高,碳稳定性越好;4)基于多元回归分析构建MAOC的空间预测模型揭示,MAOC含量呈现由西北向东南递增的空间异质性格局。研究结果有助于深入理解干旱半干旱区草地生态系统MAOC的空间特征与影响因素,为新疆及干旱区“双碳”战略背景下制定陆地碳管理政策提供科学支撑。

关键词: 矿物结合态有机碳, 空间分布, 主控因子, 干旱草地

Abstract:

Mineral-associated organic carbon (MAOC) is a relatively stable and important fraction of soil organic carbon, and variations in its content directly affect the composition and long-term stability of soil carbon pools. In arid grassland ecosystems in particular, MAOC plays a key role in long-term carbon sequestration and the functioning of carbon sinks. However, studies on the spatial pattern of MAOC in grasslands of the arid and semi-arid regions of central Asia and the main factors controling it remain limited. In this study, we focused on grassland on the northern slope of the Tianshan Mountains in Xinjiang, and examined the spatial distribution characteristics and driving mechanisms of MAOC considering grassland type, soil profile, and topographic-climatic-soil factors. The results show that: 1) The MAOC content decreased with increasing soil depth, with the largest decreases in mountain meadow, followed by typical steppe, and then desert steppe; 2) The MAOC content was significantly negatively correlated with air temperature and soil pH, and significantly positively correlated with elevation, slope, available phosphorus and total nitrogen; 3) The carbon stability index values were higher in deeper soil layers, indicative of higher carbon stability in deeper layers; 4) A spatial prediction model for MAOC based on multiple regression analyses revealed a spatially heterogeneous pattern where the MAOC content increased from northwest to southeast. These results deepen our understanding of the spatial characteristics of MAOC and factors influencing MAOC in arid and semi-arid grassland ecosystems, and provide scientific support for formulating land carbon management policies under the “dual carbon” strategy in Xinjiang and other dryland regions.

Key words: mineral-associated organic carbon (MAOC), spatial distribution, main controlling factors, arid grassland