水田和旱地土壤有机碳矿化规律及矿化量差异研究  

Rules and Differences of Soil Organic Carbon Mineralization between Paddy Field and Upland Soils

作　　者：郝瑞军[1,2,3] 李忠佩[1,2] 车玉萍[1] 方海兰 

机构地区：[1]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏南京210008 [2]中国科学院研究生院,北京100049 [3]上海市同林科学研究所,上海200232

出　　处：《土壤通报》2009年第6期1325-1329,共5页Chinese Journal of Soil Science

基　　金：江苏省自然科学基金项目(BK2007266);国家自然科学基金项目(40471066)资助

摘　　要：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 upland soils are the main use patterns of farmland which are specially important to the mechanism of organic carbon stability and the rules of soil organic carbon mineralization. By lab incubation experiment, the dynamic mineralization of SOC in paddy field and upland soils were observed, and the difference of SOC mineralization between paddy field and upland soils were also compared. The results showed that the SOC mineralization in both paddy field and upland soils decreased quickly in the beginning of the incubation, and keep relatively constant at the later incubation time and fitted to logarithmic equation. In the whole incubation time, the SOC mineralization rate in paddy field was from 0.48% to 48.40% higher than that in upland soils, and the average was 24.09%. The cumulative mineralization in paddy field was from 4.20% to 48.40% higher than that of upland soils. But the difference in soil organic carbon mineralization was mainly in the beginning of the incubation period, and the gaps narrowed along with the incubation time. Soil organic carbon mineralization was mainly influenced by the content of soil organic carbon, microbial biomass carbon and dissolved organic carbon, and the correlation coefficients were 0.948, 0.745, 0.763 respectively.

关 键 词：水田 旱地 土壤有机碳矿化 差异 

分 类 号：S153.6[农业科学—土壤学]