农业机械学报2024，Vol.55Issue(6)：294-302,9.DOI:10.6041/j.issn.1000-1298.2024.06.031
水氮运筹影响高留残茬黑土稻田碳收支机理分析
Effect of Water and Nitrogen Management on Carbon Budget in Black Soil Rice Fields with High Residual Stubble
摘要
Abstract
To investigate the impact of water and nitrogen management on the carbon budget of rice field ecosystems,field experiments were conducted,with two irrigation modes:dry-wet-shallow irrigation(D)and flooded irrigation(F),as well as three fertilization levels:110 kg/hm2(local fertilization standard,N1),99 kg/hm2(nitrogen reduction of 10％,N2),and 88 kg/hm2(nitrogen reduction of 20％,N3).The dry matter quality and carbon content of different organs of rice harvested in residual rice fields were observed,the CO2 and CH4 emissions fluxes from rice fields were simultaneously monitored,and the net primary productivity(NPP)of rice and the net ecosystem primary productivity(NECB)of rice fields were calculated.The results showed that water and nitrogen management would affect the dry matter and carbon content of various organs in rice plants.Among all treatments,the NPP of DN2 treatment was the highest(8 918.02 kg/hm2),and the NPP of dry-wet-shallow irrigation mode was greater than that of flooded irrigation mode,increasing by 12.13％,36.73％,and 8.01％,respectively.The dry-wet-shallow irrigation mode increased the CO2 emission flux of rice field soil respiration,reduced the application of nitrogen fertilizer reduced the CO2 emission flux,and reduced the application of nitrogen fertilizer in dry-wet-shallow irrigation reduced the CH4 emission flux.The total emissions of CO2 and CH4 from each treatment under both irrigation modes dwere ecreased with the decrease of nitrogen fertilizer application.The total emissions of CH4 from each treatment under flooded irrigation mode were significantly higher than those under dry-wet-shallow irrigation mode(P＜0.05).The net carbon budget of the rice field ecosystem under each treatment was positive,and the rice field ecosystem with high residual stubble in the black soil area showed a carbon"sink",with the highest NECB of 1 950.96 kg/hm2 in the DN2 treatment.Overall,the carbon sink of the rice field ecosystem treated with dry-wet-shallow irrigation mode and 10％nitrogen reduction treatment was the strongest,and the research results can provide theoretical reference and technical support for the protection of black soil in cold regions.关键词
稻田/水氮运筹/净初级生产力/净生态系统初级生产力/碳收支Key words
paddy fields/water and nitrogen management/net primary productivity/net ecosystem primary productivity/carbon budget分类
农业科技引用本文复制引用
张作合,张忠学,龚振平,薛里,周利军,吕项龙..水氮运筹影响高留残茬黑土稻田碳收支机理分析[J].农业机械学报,2024,55(6):294-302,9.基金项目
国家重点研发计划项目(2022YFD2300303)、绥化学院2021年科研启动基金项目(SQ21009)、黑龙江省省属高等学校基本科研业务费一般项目(YWF10236230215)和黑龙江省大学生创新创业训练计划项目(202310236041) （2022YFD2300303）
