Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (7): 2219-2226.DOI: 10.11733/j.issn.1007-0435.2025.07.017

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Characteristics of Soil Carbon Distribution and Transfer of Organic Carbon to Inorganic Carbonate in Desert Steppe

WANG Xue-ren1,2, YAO Jia1,2, ZHANG Pu-he1,2, WANG Wei-ni3, LIU Chang-tao4, ZHAO Shi-xiang1,2   

  1. 1. Key Laboratory of Soil Quality and Nutrient Resources of Inner Mongolia Autonomous Region, Resource and Environment College, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China;
    2. Key Laboratory of Agricultural Ecological Safety and Green Development of Autonomous Region in Higher Education, Hohhot, Inner Mongolia 010018, China;
    3. Ecological and Resource Protection Center of Agriculture and Animal Husbandry, Ordos City, Inner Mongolia Autonomous Region, Ordos, Inner Mongolia 017200, China;
    4. Inner Mongolia Pratacultural Technology Innovation Center Co. Ltd, Hohhot, Inner Mongolia 010010, China
  • Received:2024-09-02 Revised:2024-11-16 Online:2025-07-15 Published:2025-07-18

荒漠草原土壤碳分布特征及有机碳向无机碳酸盐的转移

王雪韧1,2, 姚佳1,2, 张普河1,2, 王伟妮3, 刘长涛4, 赵世翔1,2   

  1. 1. 内蒙古农业大学资源与环境学院内蒙古自治区土壤质量与养分资源重点实验室, 内蒙古 呼和浩特 010018;
    2. 农业生态安全与绿色发展自治区高等学校重点实验室, 内蒙古 呼和浩特 010018;
    3. 内蒙古自治区鄂尔多斯市农牧业生态与资源保护中心, 内蒙古 鄂尔多斯 017200;
    4. 内蒙古草业技术创新中心有限公司, 内蒙古 呼和浩特 010010
  • 通讯作者: 赵世翔,E-mail:zhaoshixiang1989@126.com
  • 作者简介:王雪韧（1998-），男，汉族，安徽宿州人，硕士研究生，主要从事土壤碳研究，E-mail：wxr9837@163.com
  • 基金资助:
    鄂尔多斯市“揭榜挂帅”项目（JBGS-2021-001）；国家草业技术创新中心（筹）重大创新平台建设专项（CCPTZX2023B0302）；内蒙古自然科学基金（2024LHMS04010）资助

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Abstract: In this study， the desert steppe in Siziwangqi， Inner Mongolia was used as the study area to investigate the vertical distribution characteristics of soil carbon， and the stable carbon isotope technique was used to differentiate lithogenic carbonate（LC） and pedogenic carbonate（PC）， to quantify the amount of fixed CO2 and the proportion of the source in the formation process of PC， and finally to quantify the transfer of SOC to SIC. The results showed that in the plant growth period， the SOC content in the soil was 3.38-10.84 g·kg-1 and 3.44~12.28 g·kg-1， respectively， and both of them showed a decreasing trend with the deepening of the soil layer； the carbonate content in the soil was 28.14-189.61 g·kg-1 and 27.47-192.13 g·kg-1， showing an increasing and then decreasing trend with the deepening of the soil layer. During the plant growth period， the PC content in the soil layers of 40-60 cm， 60-80 cm and 80-100 cm were 82.40， and 25.44 g·kg-1， the amount of fixed CO2 was 18.13， 24.87 and 5.60 g·kg-1； and the proportion of soil respiration from the source was 56.91%， 51.91%， and 65.91%， respectively. Soil respiration released CO2 was the main contribution. Finally， the amount of SOC transferred to carbonate in the three soil layers was calculated to be 5.16， 6.46， and 1.84 g·kg-1. This study had a preliminary investigation of carbon transfer and provided a theoretical basis for subsequent research on the “carbon cycle”.

Key words: Soil carbon, Stable isotope, Profile characterization, Pedogenic carbonate, Carbon transfer

摘要： 本研究以内蒙古四子王旗荒漠草原为研究区，探究土壤碳垂直分布特征，并结合稳定碳同位素技术区分土壤原生碳酸盐（Lithogenic carbonate，LC）及次生碳酸盐（Pedogenic carbonate，PC），量化PC形成过程中固定CO2气体的量及来源比例，从而定量计算土壤有机碳（Soil organic carbon，SOC）向无机碳（Soil inorganic carbon，SIC）的转移。结果表明：在植物生长季，土壤SOC含量范围分别为3.38~10.84 g·kg-1及3.44~12.28 g·kg-1，均随土层的加深而减少；土壤碳酸盐含量范围分别为28.14~189.61 g·kg-1及27.47~192.13 g·kg-1，随土层的加深呈现出先增高后减少的趋势，均在60~80 cm处达到最大值。40~60 cm，60~80 cm，80~100 cm土层土壤的PC含量分别为82.40，113.05，25.44 g·kg-1；固定CO2的量分别为18.13，24.87和5.60 g·kg-1；土壤呼吸释放CO2为主要贡献源。最后计算得出三个土层土壤内碳转移的量为5.16，6.46和1.84 g·kg-1。本研究对碳转移进行初步探究，为后续“碳循环”研究提供理论基础。

关键词: 土壤碳, 稳定同位素, 剖面特征, 次生碳酸盐, 碳转移

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