亚热带水田土壤团聚体有机质对长期秸秆还田的响应  

Response of soil organic matter in aggregates to long-term straw incorporation in a subtropical paddy field

作　　者：徐海静 柳开楼[3] 郭长城[1] 娄翼来[4] 王义东[1,2] XU Haijing;LIU Kailou;GUO Changcheng;LOU Yilai;WANG Yidong(Tianjin Key Laboratory ofWater Resources and Environment,Tianjin Normal University,Tianjin 300387,China;School of Geographic and Environmental Sciences,Tianjin Normal University,Tianjin 300387,China;National Engineering and Technology Research Center for Red Soil Improvement,Jiangxi Institute of Red Soil,Nanchang 331717,China;Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081,China)

机构地区：[1]天津师范大学天津市水资源与水环境重点实验室,天津300387 [2]天津师范大学地理与环境科学学院,天津300387 [3]江西省红壤研究所国家红壤改良工程技术研究中心,南昌331717 [4]中国农业科学院农业环境与可持续发展研究所,北京100081

出　　处：《天津师范大学学报（自然科学版）》2024年第1期69-74,共6页Journal of Tianjin Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(31300381,41201288).

摘　　要：为了探究长期秸秆还田处理下土壤团聚体有机碳含量和固碳效率的变化情况,以江西省进贤县稻田红壤为研究对象,分别进行常规处理和常规+秸秆还田处理,利用元素分析仪测定不同粒级土壤团聚体的碳、氮含量,并通过土壤有机碳(soil organic carbon,SOC)固存量和累积碳投入量计算土壤固碳效率.结果表明:①稻田红壤的优势团聚体粒级为[0.250,2.000)mm,质量占比为40.64%~47.04%.与常规处理相比,常规+秸秆还田处理对各级团聚体的质量占比和土壤团聚体稳定性指标均无显著影响.②相比于常规处理,常规+秸秆还田处理下全土的SOC和总氮(total nitrogen,TN)含量分别显著增加13.60%和10.17%,但全土的C/N以及各级团聚体的SOC含量、TN含量和C/N均未发生显著变化.③相比于常规处理,常规+秸秆还田处理下土壤的SOC固存量和累积碳投入量分别显著增加55.37%和216.76%,但固碳效率显著降低50.85%.综上,在南方亚热带红壤双季稻种植区,秸秆还田有利于SOC的固存,但降低了土壤固碳效率,对土壤团聚体稳定性的影响不显著.To explore the changes in soil organic carbon content and carbon sequestration efficiency of soil aggregates under long-term straw return treatment,the paddy red soil in the Jinxian County of Jiangxi Province was selected as the research object,and conventional treatment and conventional treatment combined with straw incorporation were carried out respectively.Carbon and nitrogen content were measured by an element analyzer,and carbon sequestration efficiency of soil was calculated through soil organic carbon(SOC)sequestration amount and accumulated carbon input amount.The results showed that:①The dominant aggregates size of paddy red soil was[0.250,2.000)mm,with a mass proportion of(40.64%-47.04%).Com-pared with the conventional treatment,the conventional treatment conbined with straw incorporation treatment had no signifi-cant effect on the mass proportion of aggregates with different fractions and the stability index of soil aggregates.②Com-pared with the conventional treatment,SOC and the total nitrogen(TN)contents increased significantly by 13.60%�and 10.17%�in the bulk under the conventional treatment combined with straw incorporation,respectively,but C/N in the bulk soil and SOC content,TN content,and C/N in all aggregate fractions didn′t change significantly.③Compared with the convention-al treatment,the SOC sequestration amount and the cumulative carbon input amount were increased by 55.37%�and 216.76%�under the conventional treatment combined with straw incorporation.However,the carbon sequestration efficiency of the con-ventional treatment combined with straw incorporation was significantly reduced by 50.85%�compared with the conventional treatment.In conclusion,straw incorporation is beneficial to SOC sequestration in the southern sub-tropical red-soil double-cropping rice areas,but is not conducive to the improvement of soil carbon sequestration efficiency,and has no significant impact on the stability of soil aggregates.

关 键 词：亚热带水田 秸秆还田 土壤团聚体 土壤有机碳 固碳效率 

分 类 号：P951[天文地球—自然地理学] S153[农业科学—土壤学]