土壤2023，Vol.60Issue(5)：964-973,10.DOI:10.13758/j.cnki.tr.2023.05.005
长期连续秸秆还田和生物质炭施用对稻田N2O排放的影响
Effects of Long-term Continuous Straw Incorporation and Biochar Application on N2O Emission from Paddy Field
摘要
Abstract
A 11-year experiment was conducted in 2010 in order to evaluate the effects of long-term continuous straw incorporation and biochar application in wheat season on N2O emission from a paddy field under rice-wheat rotation system,in which five treatments were setup:no maize straw incorporation and biochar application(CK);6 t/(hm2·a)maize straw incorporation(CS);2.4 t/(hm2·a)biochar application(BC1);6 t/(hm2·a)biochar application(BC2)and 12 t/(hm2·a)biochar application(BC3).The results showed that BC2 and BC3 significantly improved soil properties such as alkaline hydrolysis nitrogen(AN),available phosphorus(AP),available potassium(AK),readily oxidizable carbon(ROC),dissolvable organic nitrogen(DON)and soil microbial biomass nitrogen(SMBN).CS,BC1 and BC2 had no significant effect on seasonal cumulative N2O emission from paddy soil,while seasonal cumulative N2O emission increased by 245.31%under BC3 compared to CK.Seasonal cumulative N2O-N emission and the peak period cumulative emission after nitrogen application of BC3 were increased by 3.84 kg/hm2 and 3.36 kg/hm2,respectively,compared to CK.The promoting effect of BC3 on soil N2O emission was mainly in the peak period of N2O emission after nitrogen fertilizer application.Compared to CK,BC3 significantly increased soil cation exchange capacity(CEC),microbial biomass carbon(SMBC)and SMBN by 20.35%,26.13%and 49.96%,respectively.Cumulative emissions at the peak period of N2O emissions caused by re-flooding and panicle fertilizer application accounted for 27.66%-32.83%of seasonal cumulative emissions,of which BC3 having the highest proportion.In conclusion,long-term continuous application of biochar can increase soil CEC and the retention of soil NH4+ ,thus can promote soil nitrification process,and interval prolongation between panicle fertilizer and re-flooding may effectively reduce N2O emission from paddy fields.关键词
N2O/生物质炭/秸秆还田/长期连续/稻田Key words
N2O/Biochar/Straw incorporation/Long-term continuous/Paddy field分类
农业科技引用本文复制引用
靳鹏辉,陈哲,王慧,徐乔,胡天龙,周蓉,蔺兴武,刘琦,谢祖彬..长期连续秸秆还田和生物质炭施用对稻田N2O排放的影响[J].土壤,2023,60(5):964-973,10.基金项目
国家重点研发计划项目(2021YFD1901201-04)和国家自然科学基金项目(42077101)共同资助 Supported by the National Key Research and Development Program of China(No.2021YFD1901201-04)and the National Natural Science Foundation of China(No.42077101) （2021YFD1901201-04）
