土壤2025，Vol.57Issue(4)：799-805,7.DOI:10.13758/j.cnki.tr.2025.04.010
河套灌区农田土壤有机碳向无机碳酸盐转移的定量研究
Quantitative Study on Transfer of Organic Carbon to Inorganic Carbonate in Farmland Soils of Hetao Irrigation Area
摘要
Abstract
This study targeted the agricultural soils in the Hetao irrigation area,combined with the stable carbon isotope technique to determine soil organic carbon(SOC),inorganic carbon(SIC),and CO2 gas isotope value(δ13C value),to differentiate between lithogenic carbonate(LC)and pedogenic carbonate(PC),and finally to quantify the amount and source proportion of fixed CO2 gas during the formation of PC formation,and finally quantify the carbon transfer from SOC to inorganic carbonate.The results showed that,in the 40-60,60-80 and 80-100 cm soil layers,the proportion of PC was 46.59%,28.09%and 30.39%,respectively,and the mass of PC was 35.88,20.15 and 21.35 g/kg,respectively.During the formation and recrystallization of PC,the amounts of CO2 fixed by the three soil layers were 7.73,4.43 and 5.04 g/kg,respectively;among which,4.43,2.70 and 3.41 g/kg from the atmosphere,3.30,1.73 and 1.64 g/kg from soil respiration,respectively;which indicated the atmospheric CO2 as the main contributor.The amount of carbon transferred from SOC to inorganic carbonate was 1.65,0.87 and 0.82 g/kg,respectively.This study is a preliminary investigation of intra-soil carbon transfer,which is important for understanding soil carbon dynamics and maintaining ecosystem stability in the Hetao irrigation area.关键词
土壤碳/稳定碳同位素/次生碳酸盐/碳转移Key words
Soil carbon/Stable carbon isotopes/Pedogenic carbonates/Carbon transfer分类
农业科技引用本文复制引用
王雪韧,姚佳,李奕含,王伟妮,刘长涛,杜时荣,赵世翔..河套灌区农田土壤有机碳向无机碳酸盐转移的定量研究[J].土壤,2025,57(4):799-805,7.基金项目
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)和内蒙古自然科学基金项目(2024LHMS04010)资助. （JBGS-2021-001）
