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| 基于稳定同位素技术的土壤有机碳转化特征研究 |
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姚佳1,2, 王雪韧1,2, 于群家3, 刘长涛4, 赵世翔1,2
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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.内蒙古农业大学 草原资源教育部重点实验室，内蒙古 呼和浩特 010018;4.内蒙古草业技术创新有限公司，内蒙古 呼和浩特 010010
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| 摘要: |
| 【 目的】分析农田土壤有机碳（soil organic carbon，SOC）及无机碳（soil inorganic carbon，SIC）的分布特 征，定量计算SOC向无机碳酸盐的转化量，旨在为农田土壤改良、探明碳循环过程提供参考。【 方法】于2023年玉米生长季前（5月8日）和生长季后（10月12日），在内蒙古自治区内蒙古农业大学科技园区内采集不同土层土样以及土壤CO2气体，结合碳稳定同位素技术测定SOC、SIC含量及其稳定同位素值（δ13C），在此基础上计算土壤次生碳酸盐 （pedogenic carbonate，PIC）形成过程中CO2来源及质量，探究固碳过程中SOC向无机碳酸盐转化量。【 结果】在作物生长季，0~100 cm土层SOC含量为6.01~13.38 g/kg，随土层深度增加总体降低；0~100 cm土层土SIC含量为9.95~30.32 g/kg，随土层深度的增加呈先下降后上升再下降的变化趋势；0~100 cm土层SOC和 SIC的δ13C总体呈增加趋势。0~100 cm土层PIC占比为2.12%~27.04%，PIC含量为0.49~6.84 g/kg。在PIC形成过程中，土壤呼吸 产生的CO2含量为0.07~0.89 g/kg，是土壤固定CO2的主要来源，其占比为49.72%~62.69%。0~10，10~20，20~ 40，40~60，60~80，80~100 cm土层SOC向无机碳酸盐的转化量分别为0.45，0.26，0.16，0.08，0.25，0.04 g/kg。【 结 论】探明了作物生长季内蒙古农田土壤有机碳向无机碳酸盐的转化特征，为该地区实现“碳中和”提供了参考。 |
| 关键词: 土壤有机碳 作物生长季 有机碳转化 次生碳酸盐 碳稳定同位素 农田土壤 |
| DOI：10. 13207/j. jnwafu. 2026. 05. 017 |
| 分类号: |
| 基金项目:国家草业创新技术中心（筹）重大创新平台专项（CCPTZX2023B0302）；内蒙古自然科学基金项目（2024LHMS04010） |
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| Transformation characteristics of soil organic carbon based on stable isotope technology |
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YAO Jia1,2, WANG Xueren1,2, YU Qunjia3, LIU Changtao4, ZHAO Shixiang1,2
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1.Key Laboratory of Soil Quality and Nutrient Resources of Inner Mongolia Autonomous Region，College of Resources and Environmental Sciences，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.Key Laboratory of Grassland Resources of the Ministry of Education，Inner Mongolia Agricultural University，Hohhot，Inner Mongolia 010018，China;4.Inner Mongolia Pratacultural Technology Innovation Central Co. Ltd，Hohhot Inner Mongolia 010010，China
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| Abstract: |
| 【 Objective】This research aims to analyze the distribution characteristics of soil organic carbon （SOC） and soil inorganic carbon（ SIC） in farmland，and to quantify the conversion of SOC to inorganic carbonate，to provide a reference for farmland soil improvement and probing the carbon cycle process.【Method】Soil samples of different soil layers as well as soil CO2 gas were collected in the Science and Technology Park of Inner Mongolia Agricultural University，Inner Mongolia Autonomous Region，before（May 8） and after（October 12） the growing season of maize in 2023，and the SOC and SIC contents and their stable isotope values（δ13 C） were determined by carbon stable isotope techniques. On this basis，the CO2 source and mass in the process of pedogenic carbonate（ PIC） formation in the soil was calculated，and the SOC amount converted to inorganic carbonate during carbon sequestration was explored.【Result】During the crop growing season，the SOC content of the 0?100 cm soil layer ranged from 6. 01 to 13.38 g/kg，which generally decreased with increasing soil depth.The soil SIC content of the 0?100 cm soil layer ranged from 9.95 to 30.32 g/kg，which showed a trend of initially decreasing，then increasing and finally decreasing with the increasing soil depth. The δ13C of the SOC and SIC of the 0?100 cm soil layer showed a generally increasing trend. The proportion of PIC in the 0?100 cm layer ranged from 2.12% to 27.04%，and the content of PIC ranged from 0.49 to 6.84 g/kg. During the process of PIC formation，the content of CO2 produced by soil respiration ranged from 0.07 to 0.89 g/kg，which was the main source of CO2 fixed by the soil，and the proportion of CO2 ranged from 49.72% to 62.69%. For 0?10，10?20，20?40，40?60，60?80，and 80?100 cm soil layers，the amount of SOC converted to inorganic carbonate was 0.45，0.26，0.16，0.08，0.25，and 0.04 g/kg，respectively.【Conclusion】The conversion of organic carbon to inorganic carbonate in Inner Mongolia’s agricultural soils during the growing season was charac?
terized，providing a reference for the realization of‘ carbon neutrality’ in the region. |
| Key words: soil organic carbon crop growing season SOC transformation pedogenic carbonates carbon stable isotopes agricultural soils |
