中文摘要：

采用布点采样、室内分析测试方法，研究了安徽省贵池区农田土壤有机碳分布变化。结果表明，水稻土土壤有机碳含量及碳密度高于旱作土。贵池区（县域尺度）1984年水田耕层有机碳含量比旱地高出1/3，有机碳密度高出约5％。根据2005年贵池区土壤调查监测数据统计分析得出：水田耕层有机碳含量比旱地高出45．18％，有机碳密度高出23．73％。对比贵池区1984年和2005年两个时段的农田土壤有机碳的含量和碳密度：水稻土有机碳含量年均提高了2．01％，有机碳密度年均提高了3％；旱作土有机碳含量年均提高了1．11％，有机碳密度年均增加了1．3％。农田土壤有机碳含量与土壤性质相关。贵池区农田土壤有机碳与速效磷、碱解氮呈正相关，水稻土粘粒含量与有机碳含量呈正相关，而旱作土则无线性相关。

英文摘要：

SOC content and carbon density in paddy soil were higher than that in dry cropland. SOC content and density in paddy soil were 1/3 and 5% higher respectively than that in dry cropland in 1984 while they in paddy soil were 45.18% and 23.73% higher respectively than that in dry cropland in 2005 in Guichi county. Compared 1984 to 2005 in Guiehi county, SOC content and density in paddy soil raised 2.01% and 3%, respectively, while dry cropland 1.11% and 1.3% every year. There was a close relationship between SOC content and soil property. However, there was difference between dry cropland and paddy soil for the factors impacting SOC content in Guichi county. The positive correlation was shown between SOC and available P, available N and clay content for paddy soil.