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23年定位试验结果表明:土壤有机碳、全氮和碱解氮、生物氮量以:高量有机肥区>低量有机肥区>化肥区>对照。土壤C/N基本维持在11~16之间。单施化肥处理土壤微生物碳量降低,Kos值高于其它施化肥处理,有机无机肥配合施用,结合态腐殖质含量明显下降,松结态/重组腐殖质的比值和松/紧比值也有所降低。有机无机配施各处理土壤微生物碳量,以及土壤松结态、稳结态、紧结态腐殖质的含量显著升高,提高松结态/重组腐殖质和松/紧的比值;不同用量的施有机肥处理土壤微生物碳量与对照相比差异不显著,Kos值下降,其他指标均升高。
The result of 23-year experiment indicates that the contents of soil organic carbon, total nitrogen and available nitrogen, and biological nitrogen are as follows: high organic fertilizer area> low organic fertilizer area> chemical fertilizer area> control. Soil C / N basically maintained at between 11 ~ 16. Under single application of chemical fertilizers, soil microbial biomass carbon decreased, Kos values were higher than those of other chemical fertilizers, organic and inorganic fertilizers combined application, the content of bound humus obviously decreased, and the ratio of loosely coupled / reorganized humus and loose / tight ratio also decreased. The content of soil microbial biomass carbon and the soil loosely-coupled, steady-state and tight-junction humus increased significantly with organic-inorganic combination treatments, and the ratio of loosely-united / reorganized humus and loose / Compared with the control, soil microbial biomass carbon fertilizer did not show significant difference, Kos value decreased, and other indexes increased.