南方种养结合模式对冬季稻田净碳交换和不同土层活性碳氮转化的影响
发布时间:2018-04-20 07:04
本文选题:冬闲稻田 + 种草养鸡 ; 参考:《草业学报》2017年07期
【摘要】: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。
[Abstract]:In order to study the changes of active carbon and nitrogen and systematic net carbon exchange in winter paddy soil under different utilization patterns. In this study, soil microbial biomass carbon nitrogen, soluble carbon nitrogen and systematic net carbon exchange (net carbon exchange) of winter rice paddy soil were quantitatively analyzed, such as FGN, RGN, RCN, RCCand MCM) in winter paddy field. The soil microbial biomass, soluble carbon and net carbon exchange (net carbon exchange) in winter paddy field were studied. The results were as follows: (1) in this paper, the soil microbial biomass, soluble carbon and net carbon exchange were quantitatively analyzed. The results showed that RC and MC increased the net carbon emissions of the system in a short period of time, and increased the net carbon emissions before sowing early rice. During the day, the total carbon sequestration RC was 817.38 g / m ~ (2) C ~ (2 +) = 472.90 g / m ~ (2 +), and all the treatments showed weak carbon sequestration of 3.06 ~ 22.88 mg 路m ~ (2 +) and M ~ (2 +), which were significantly higher than that of F and R ~ (3) C ~ (3) C ~ (2 +) C ~ (3) C ~ (2 +) R and M ~ (3) C ~ (3) C ~ (2 +) C ~ (2 +) C ~ (2 +) C ~ (2 +). The average value of biomass carbon was lower than that of R and Mbut the average value of soil soluble carbon was higher than that of RCMC. Increased soil carbon sequestration. To sum up, the combination of planting and raising not only increased soil active carbon and nitrogen, but also increased carbon sequestration in winter rice field system.
【作者单位】: 湖南农业大学农学院;
【基金】:国家自然科学基金(41571293,31100382) 湖南省科技厅区域合作项目(2016WK2009) 国家水稻产业岗位专家体系项目(CARS-01-30)资助
【分类号】:S154;S181
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