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水田和旱地是农田土壤的主要利用方式,对有机碳的稳定机制和矿化规律具有重要影响。本研究通过室内培养试验观测了水田、旱地土壤有机碳的矿化动态,并比较了两者之间有机碳矿化量的差异。结果表明,水田、旱地土壤有机碳矿化规律均表现为培养前期快速下降,培养后期保持相对稳定的趋势,符合对数关系。但整个培养期内,水田土壤有机碳矿化速率比旱地土壤平均高24.09%,大小幅度变化在4.48%～48.40%之间,累计矿化量高4.20%～48.40%,且有机碳矿化量差异主要集中在培养前期,随着培养时间的延长而不断缩小。统计结果表明,供试水田、旱地土壤有机碳矿化速率主要受有机碳(SOC)、微生物生物量碳(MBC)及水溶性有机碳(DOC)含量影响,相关系数分别为0.948、0.745、0.763。
Paddy field and dry land are the main ways of using farmland soils, which have a significant impact on the stability mechanism and mineralization of organic carbon. In this study, the mineralization dynamics of soil organic carbon in paddy field and dry land were observed through indoor culture experiment, and the difference of organic carbon mineralization between the two was compared. The results showed that the organic carbon mineralization in paddy field and upland soil showed a trend of rapid decrease in the early stage of culture and a relatively stable trend in the late stage of cultivation, in accordance with the logarithmic relationship. However, during the whole incubation period, the rate of soil organic carbon mineralization in paddy soil was 24.09% higher than that in dry land, and the range of magnitude was 4.48% ~ 48.40%. The cumulative mineralization was 4.20% ~ 48.40%, and the mineralized amount of organic carbon The difference mainly concentrated in the early stage of training, with the extension of training time and continue to shrink. The statistical results show that the mineralization rate of soil organic carbon in paddy field and dry land is mainly affected by the content of organic carbon (SOC), microbial biomass carbon (MBC) and water-soluble organic carbon (DOC), the correlation coefficients are 0.948, 0.745 and 0.763 .