中国土壤与肥料Issue(4)：12-21,10.DOI:10.11838/sfsc.1673-6257.25403
节水灌溉减氮配施生物质炭对稻田土壤碳平衡的影响
Effects of water-saving irrigation and nitrogen reduction combined with biochar application on soil carbon balance in paddy fields
摘要
Abstract
In order to explore the effect of nitrogen reduction combined with biochar application on soil carbon balance in paddy field under water-saving irrigation,a field plot experiment was carried out with conventional nitrogen application level+no biochar application(B0N1)as the control.12.5 t/hm2 biochar+10％nitrogen reduction(B1N2),25 t/hm2 biochar+10％nitrogen reduction(B2N2),12.5 t/hm2 biochar+20％nitrogen reduction(B1N3),25 t/hm2 biochar+20％nitrogen reduction(B2N3),12.5 t/hm2 biochar+30％nitrogen reduction(B1N4),25 t/hm2 biochar+30％nitrogen reduction(B2N4)treatments were set up to observe the emission of CO2 and CH4 in paddy field,as well as the dry matter quality and carbon content of each organ of rice plant at harvest.The total carbon sequestration,net primary productivity(NPP)and net soil carbon budget(NSCB)of rice plants were calculated.The results showed that the reduction of nitrogen fertilizer reduced the total emission of CO2 and CH4 in the growth period of rice field,while the increase of biochar application increased the total emission of CO2 in paddy soil and reduced the total emission of CH4 in paddy soil.Appropriate reduction of nitrogen fertilizer combined with biochar application increased the total carbon sequestration of rice plants,while excessive reduction of nitrogen fertilizer or biochar application reduced the total carbon sequestration of rice plants.The NPP in the growth period of rice field decreased with the increase of biochar application rate and nitrogen fertilizer reduction.The B1N2 treatment had the highest NSCB of 823.17 kg/hm2,and its NPP,NSCB and yield were significantly higher than those of other treatments(P＜0.05).On the whole,the carbon sink capacity of paddy ecosystem with 10％nitrogen reduction in water-saving irrigation combined with 12.5 t/hm2 biochar was the strongest.The study could provide a theoretical basis for the scientific development of water-saving,fertilizer-saving,yield-increasing,carbon sequestration and emission reduction management strategies in black soil paddy fields.关键词
稻田/节水灌溉/减氮/生物质炭/碳平衡Key words
paddy/water-saving irrigation/nitrogen reduction/biochar/carbon balance引用本文复制引用
张作合,张忠学,孔凡丹..节水灌溉减氮配施生物质炭对稻田土壤碳平衡的影响[J].中国土壤与肥料,2026,(4):12-21,10.基金项目
绥化学院科研启动基金项目(SQ242002) （SQ242002）
黑龙江省自然科学基金项目(LH2024E099). （LH2024E099）
