土壤学报2025，Vol.62Issue(5)：1435-1448,14.DOI:10.11766/trxb202405210205
南方酸性红壤区长期秸秆炭化还田的土壤固碳效应差异
Differences in Soil Carbon Sequestration Effects of Long-term Carbonization Straw Return on Soil in Acidic Red Soil Areas in Southern China
摘要
Abstract
[Objective]Converting agricultural straw into biochar and then returning it to the field has received widespread attention at home and abroad as a potential pathway for soil improvement and carbon sequestration and emission reduction in the southern acidic red soil area.[Method]Relying on soil column experiments of rice-wheat paddy-upland rotation and millet-wheat upland-upland rotation established in June 2011,the changes in the quantity and chemical composition of organic carbon in paddy soils(QP and TP)and upland soils(QU and TU)developed from Quaternary red clay and Tertiary red sandstone soils under long-term straw biochar application(BC0,0 t·hm-2 per season;BC11.3,11.3 t·hm-2 per season)were analyzed.We used 13C solid-state NMR to clarify the differences in carbon sequestration effect of biochar application on different acidic red soils.[Result]The results showed that:(1)soil texture,land use type,and their interaction significantly affected soil organic carbon density under biochar treatment.Compared with BC0,under the same land use pattern,the increase in soil organic carbon density from 0-20cm was higher in partial clayey soils(QP,25.22 kg·m-2;QU,8.07 kg·m-2)than sandy soils(TP,8.67 kg·m-2;TU,7.58 kg·m-2),and higher in paddy soils than upland soils after 11 years of BC11.3 treatment.(2)Under the same land use pattern,there was no significant difference in the contents of each functional group of soil organic carbon with different textures.The change in the utilization pattern of paddy and upland significantly affected soil organic carbon stability.The proportions of alkyl carbon and O-alkyl carbon in paddy soil were higher than those in upland soil,and the proportion of aromatic carbon was lower than that in upland soil.Also,the stability of retained organic carbon in upland soil was higher.[Conclusion]We observed that the organic carbon sequestration potential of partial clay soil is higher than that of sandy soil after long-term straw carbonization and returning to the field in the acidic red soil area of South China,but there was no difference in long-term stability.Organic carbon sequestration in paddy soils was greater than in upland,but the stability of soil organic carbon was lower than in upland soils.关键词
生物质炭/土壤质地/耕作管理/土壤固碳/有机碳分子结构Key words
Biochar/Soil texture/Tillage management/Soil carbon sequestration/Organic carbon molecular structure分类
农业科学引用本文复制引用
杨馨,徐灵颖,夏龙龙,赵旭..南方酸性红壤区长期秸秆炭化还田的土壤固碳效应差异[J].土壤学报,2025,62(5):1435-1448,14.基金项目
国家自然科学基金面上项目(42277331)、国家重点研发计划项目(2023YFD1901304)资助 Supported by the National Natural Science Foundation of China(No.42277331)and the National Key R&D Program of China(No.2023YFD1901304) （42277331）
