荒漠草原土壤碳分布特征及有機碳向無機碳酸鹽的轉移

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中圖分類號：S153 文獻標識碼：A 文章編號：1007-0435（2025）07-2219-08

引用格式：，等.荒漠草原土壤碳分布特征及有機碳向無機碳酸鹽的轉移[J].草地學報，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

土壤碳庫包括土壤有機碳（Soilorganiccarbon，SOC）和土壤無機碳（Soilinorganiccarbon，SIC），是陸地生態(tài)系統(tǒng)中最大且周轉時間最長的碳庫[1。（剩余12285字）