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为探讨不同利用模式下的冬季稻田土壤活性碳氮变化和系统净碳交换变化特征。本研究对冬闲(F)、单种黑麦草(R)、单种紫云英(M)、种黑麦草养鸡(RC)以及种紫云英养鸡(MC)的冬季稻田土壤微生物量碳氮、可溶性碳氮及系统净碳交换量进行了定量分析。结果表明,1)RC和MC短期内增加了系统净碳排放,在早稻播种前,白天总体表现为碳汇(RC为817.38g/m2,MC为472.90g/m2);且所有处理对CH4表现为弱汇(3.06~22.88mg/m2)。2)R和M固碳量显著高于F和RC、MC处理。3)RC,MC,R和M与F相比显著提高了土壤活性碳氮含量。4)虽然RC和MC土壤微生物量碳平均值低于R和M,但其土壤可溶性碳含量平均值更高。5)R,M,RC,MC提高了土壤有机碳含量,增加了土壤碳汇。综上所述,种养结合既提高了土壤活性碳氮,同时增加了冬季稻田系统固碳量。
In order to investigate the characteristics of soil active C and N changes and net carbon exchange in winter paddy under different utilization patterns. In this study, winter wheat (F), single ryegrass (R), single species of milk vetch (R), ryegrass chickens (RC) Nitrogen, soluble carbon and nitrogen and net carbon exchange of the system were quantitatively analyzed. The results showed that 1) RC and MC increased net system carbon emissions in the short term. Before sowing of early rice, the total carbon sequestration (RC: 817.38g / m2, MC: 472.90g / m2) For weak exchange (3.06 ~ 22.88mg / m2). 2) The carbon sequestration of R and M was significantly higher than that of F and RC, MC treatment. 3) Compared with F, RC, MC, R and M significantly increased soil active carbon and nitrogen content. 4) Although the average values of soil microbial biomass carbon in RC and MC were lower than those in R and M, the average soil soluble carbon content was higher. 5) R, M, RC, MC increased soil organic carbon content and increased soil carbon sink. In summary, planting and raising both improve soil active carbon and nitrogen, while increasing the amount of carbon sequestration in winter paddy fields.