荒漠草原土壤碳分布特征及有机碳向无机碳酸盐的转移

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中图分类号：S153 文献标识码：A 文章编号：1007-0435（2025）07-2219-08

引用格式：，等.荒漠草原土壤碳分布特征及有机碳向无机碳酸盐的转移[J].草地学报，2025，33（7）： 2219-2226 WANG Xue-ren，YAO Jia，ZHANG Pu-he，et al.Characteristicsof Soil Carbon Distribution and Transferof Organic Carbon to Inorganic Carbonate in Desert Steppe[J].Acta Agrestia Sinica，2025，33（7） ：2219-2226

Abstract：In this study，the desert steppe in Siziwangqi，Inner Mongolia wasused as the studyarea to investi gate 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 3.38-10.84g⋅kg-1 and3.44～12.28g⋅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 27.47-192.13g⋅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 40-60cm ， 60-80cm and 80-100 cm were 82.40，and 25.44g⋅kg-1 ，the amount of fixed CO2 was 18.13，24.87 and 5.60g⋅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 1.84g⋅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

土壤碳库包括土壤有机碳（Soilorganiccarbon，SOC）和土壤无机碳（Soilinorganiccarbon，SIC），是陆地生态系统中最大且周转时间最长的碳库[1。（剩余12285字）