施用蚓粪对滨海盐碱地土壤有机碳库及其稳定性的影响
Effects of Vermicompost Application on Organic Carbon Pool and Its Stability in Coastal Saline-alkaline Soil
卢云 1秦天扬 1陈玮峰 1蔡健 1许益伟 1李云龙 1左文刚 1陈硕桐 1单玉华 2柏彦超2
作者信息
- 1. 扬州大学环境科学与工程学院,江苏扬州 225127
- 2. 扬州大学环境科学与工程学院,江苏扬州 225127;江苏省有机固体废弃物资源化协同创新中心,南京 210018
- 折叠
摘要
为探讨施用蚯蚓粪后滨海盐碱地土壤有机碳库及其稳定性的变化,选择江苏省南通市如东县拼茶镇方凌垦区的滨海盐碱地,于2019年10月将蚯蚓粪以0、25、50、100、200 t/hm2施用量一次性施于田间,2022年10月采集耕层(0～20cm)土壤样品,测定其可溶性有机碳、钙结合有机碳、易氧化有机碳、颗粒态及矿物结合态有机碳的含量,计算碳库管理指数,并采用固体核磁共振波谱分析土壤有机碳的官能团结构.结果表明:与不施用蚯蚓粪相比,施用超过50t/hm2的蚯蚓粪后,土壤有机碳库变化显著,土壤有机碳含量增加了 35％～97％,可溶性有机碳含量增加了 27％～104％,钙结合有机碳含量增加了 19％～26％,易氧化有机碳含量增加了 6％～94％,颗粒态和矿物结合态有机碳分别增加了 14％～124％和37％～85％,土壤碳库管理指数提高了 6％～92％;土壤中脂肪族碳与芳香族碳的比值减小,烷基碳/O-烷基碳以及疏水碳/亲水碳的比值增大,表明土壤有机碳的结构稳定性有所提升.综上,施用蚯蚓粪对提高滨海盐碱地土壤有机碳库及其稳定性具有显著作用,且在50和100 t/hm2施用量下效果最佳.
Abstract
To investigate the effects of vermicompost application on organic carbon pool and its stability in coastal saline-alkaline soil,a field experiment was conducted in such soil under barley-maize rotation in Fangling Reclamation Area,Bencha Town of Rudong County,Jiangsu Province,and the vermicompost was one-time applied to the field with the rates of 0,25,50,100,200 t/hm2 in October 2019,soil samples were collected in October 2022 from the topsoil layer(0-20 cm)to determine the contents of dissolved organic carbon,calcium associated organic carbon,labile organic carbon,particulate organic carbon and mineral-associated organic carbon.The carbon pool management index was calculated,and the functional group structure of soil organic carbon was analyzed by solid-state nuclear magnetic resonance spectroscopy.The results showed that compared with no application of vermicompost,soil organic carbon pool changed significantly after application of more than 50 t/hm2 vermicompost,soil organic carbon content increased by 35％-97％,dissolved organic carbon content increased by 27％-104％,calcium associated organic carbon content increased by 19％-26％,and labile organic carbon content increased by 6％-94％,prticulate organic carbon and mineral-associated organic carbon increased by 14％-124％and 37％-85％respectively,and soil carbon pool management index increased by 6％-92％;The ratio of Aliphatic C to Aromatic C decreased,and the values of Alkyl C/O-alkyl C and Hydrophobic C/Hydrophilic C all increased,indicating the improvement in the structural stability of soil organic carbon.In conclusion,the application of vermicompost has a significant effect on the improvement of soil organic carbon pool and its stability in coastal saline-alkaline soil,and the effect is the best under the application amount of 50 and 100 t/hm2.
关键词
蚯蚓粪/滨海盐碱地/土壤有机碳库/碳库管理指数/固体核磁共振Key words
Vermicompost/Coastal saline-alkaline soil/Soil organic carbon pool/Carbon pool management index/Solid-state NMR引用本文复制引用
基金项目
国家自然科学基金项目(41977089)
江苏现代农业(水稻、蔬菜)产业技术体系项目(JATS[2023]318)
江苏现代农业(水稻、蔬菜)产业技术体系项目(JATS[2023]317)
出版年
2024
国家科技期刊平台
NSTL
万方数据