澧阳平原古水稻土有机碳矿化特征  

Characteristics of Organic Carbon Mineralization in Ancient Paddy Soils at Liyang Plain

作　　者：肖彦资 周卫军[1] 刘沛[1] 樊腾芳 陈恋[1] 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128

出　　处：《湖南农业科学》2015年第3期53-55,共3页Hunan Agricultural Sciences

基　　金：国家自然科学基金资助项目(41371228)

摘　　要：为探明古水稻土有机碳矿化过程与特征,采用恒温密闭培养方法研究了澧阳平原埋藏古水稻土有机碳的矿化累积量、矿化速率及其矿化势。结果表明,埋藏古水稻土有机碳矿化累积量明显低于现代耕作水稻土,耕作层、犁底层、潴育层和母质层的矿化累积量分别为0.11、0.10、0.10、0.09 mg/g,各层次之间差异较小;而现代耕作水稻土的分别为0.74、0.22、0.16、0.12 mg/g,各层次之间差异较大。埋藏古水稻土矿化速率在0.01-1.40 mg/（kg·d）,现代水稻土的在0.02--4.74 mg/（kg·d）。埋藏古水稻土耕作层的矿化势为0.11 mg/g,仅为现代水稻土耕作层的13.58%。To explore the mineralization processes and characteristics in the buried ancient paddy soil at Liyang plain, the mineralization cumulative amount, the mineralization rate and the mineralization potential of soil organic carbon were studied by the method of the constant temperature sealed culture. The results showed that the mineralization cumulative amount was obviously lower in the buried ancient paddy soil than the present cultivation paddy soils, it was 0.11 mg/g, 0.10 mg/g, 0.10 mg/g, 0.09 mg/g in the cultivation layer, the plow pan, the waterloggogenic horizon and the parent material horizon of the ancient paddy soil respectively, with a little differences between each other. However, while those of present cultivation paddy soils were 0.74 mg/g, 0.22 mg/g, 0.16 mg/g and 0.12 mg/g respectively, with notable variation. The mineralization rate was from 0.01 to 1.40 mg/（kg·d） in the ancient paddy soil, while from 0.02 to4.74 mg/（kg·d） in the present cultivation paddy soils. The mineralization potential was 0.11mg/g in the ancient paddy soil, while about13.58% in the present cultivation paddy soils.

关 键 词：埋藏古水稻土 矿化累积量 矿化速率 矿化势 

分 类 号：S135.612[农业科学—农业基础科学]