摘要
采集内蒙古河套灌区盐碱土壤(电导率EC为0.27mS/cm),利用NaCl调节土壤电导率为(0,10,20,40,80mS/cm),基于稳定碳同位素分析不同电导率土壤添加定量δ^(13)C-CO_(2)后,土壤CO_(2)吸收量以及土壤难溶性无机碳含量(SIC)-δ^(13)C值.结果表明,盐碱土壤能够吸收CO_(2),随土壤电导率(EC)升高,土壤CO_(2)累积吸收量增加,S5(EC=80mS/cm)CO_(2)累积吸收量比S1(0.27mS/cm)高1.6640mg.土壤SIC含量(R^(2)=0.7080,P<0.05)和土壤可溶性无机碳含量(DIC)(R^(2)=0.6096,P<0.05)与土壤EC显著负相关关系.盐碱土壤吸收CO_(2)部分固存于土壤无机碳中,外源添加δ^(13)C-CO_(2),盐碱土壤SIC-δ^(13)C值(-5.299‰~-0.8341‰)显著增加.EC为20mS/cm土壤固相保存δ^(13)C-CO_(2)总量最高1.276mg,固存δ^(13)C-CO_(2)总量占土壤吸收^(13)CO_(2)总量比例30.28%最高;EC为80mS/cm固碳量最低为0.2749mg,固存δ^(13)C-CO_(2)总量占土壤吸收^(13)CO_(2)总量比例5.579%.
The saline-alkali soil(EC=0.27mS/cm)in hetao irrigation area of Inner Mongolia was collected,and the soil conductivity was adjusted by NaCl to(0,10,20,40,80mS/cm).Based on stable carbon isotope,the soil CO_(2) uptake and insoluble inorganic carbon content(SI)of soils with different conductivity were analyzed after adding quantitativeδ^(13)C-CO_(2)-the delta ^(13)C values.The results showed that salinic-alkali soil could absorb CO_(2),and the cumulative CO_(2) uptake increased with the increase of soil conductivity(EC).The cumulative CO_(2) uptake of S5(EC=80mS/cm)was 1.6640mg higher than that of S1(0.27ms/cm).Soil SIC content(R^(2)=0.7080,P<0.05)and soil soluble inorganic carbon content(DIC)(R^(2)=0.6096,P<0.05)were significantly negatively correlated with soil EC.The value of SIC-δ^(13)C(-5.299‰~-0.8341‰)in saline-alkali soil increased significantly with the addition ofδ^(13)C-CO_(2).In EC,the highestδ^(13)C-CO_(2) concentration was 1.276mg in 20mS/cm soil,and the highestδ^(13)C-CO_(2) concentration was 30.28%in soil ^(13)CO_(2) absorption.When EC was 80mS/cm,the lowest carbon sequestration was 0.2749mg,and the totalδ^(13)C-CO_(2) sequestration accounted for 5.579%of the total ^(13)CO_(2) sequestration.
作者
刘宇斌
焦燕
杨文柱
张婧
王艳
灵灵
LIU Yu-bin;JIAO Yan;YANG Wen-zhu;ZHANG Jing;WANG Yan;LING Ling(Key Laboratory of environmental chemistry of Inner Mongolia Autonomous Region,Hohhot 010022,China;Chemistry and Environmental Science College,Inner Mongolia Normal University,Hohhot 010022,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2022年第9期4362-4368,共7页
China Environmental Science
基金
国家自然科学基金(41865010)
2020年内蒙古自治区高等学校青年科技英才领军人才(NJYT-20-A04)
第十批内蒙古自治区草原英才(2020)
2022年度内蒙古自治区杰出青年基金项目
2022年度内蒙古自治区重点研发和成果转化计划(2022YFHH0035)。
关键词
盐碱土
固碳潜力
碳吸收
碳汇
碳同位素
土壤
Saline soils
carbon sequestration potential
carbon sequestration
carbon sinks
carbon isotopes
soil
