澧阳平原埋藏古水稻土不同形态有机碳的分布特征  

Distribution characteristics of different organic carbon forms in ancient paddy soils at Liyang plain

作　　者：肖彦资 周卫军[1] 顾海滨[2] 刘沛[1] 谢天洋 谭洁[1] 

机构地区：[1]湖南农业大学资源环境学院,长沙410128 [2]湖南省文物考古研究所,长沙410008

出　　处：《生态学杂志》2015年第6期1644-1649,共6页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41371228)资助

摘　　要：为了探明埋藏古水稻土不同形态有机碳分布特征及其变化规律,研究了杉龙岗埋藏古水稻土与现代水稻土土壤有机碳、易氧化有机碳、水溶性有机碳和活性有机碳的含量差异及剖面分布特征。结果表明：埋藏古代水稻土耕作层的有机碳、水溶性有机碳、易氧化有机碳、活性有机碳含量均比现代水稻土低,仅为现代水稻土耕作层的51.86%、28.24%、40.12%和34.17%,而犁底层、潴育层和母质层的与现代水稻土层含量差异较小;埋藏古水稻土耕作层的水溶性有机碳、易氧化有机碳、活性有机碳平均含量分别占其总碳量的0.45%、37.34%和16.39%,比现代水稻土的平均含量低0.38、10.93和8.48个百分点;水溶性有机碳含量随土层深度呈下降趋势,易氧化有机碳和活性有机碳则呈上升-下降-上升趋势;埋藏古水稻土中仍然保留着3000年前积累的有机碳,虽然其耕作层的含量比现代水稻土低28%～52%,但比其犁底层、潴育层和母质层要高。说明稻田湿地对土壤碳库的贡献是相对稳定的,在全球碳循环和生态环境保护中具有重要的作用。To clarify the distribution and change characters of different organic carbon forms in ancient paddy soils,the difference and profile distribution characteristics of soil organic carbon（ SOC）,easily-oxidized organic carbon（ EOOC）,water-soluble organic carbon（ WSOC）,and active organic carbon（ AOC） contents were studied between the buried ancient paddy soil and the present cultivation paddy soils in Shanlonggang Village,Hunan Province. The results showed that the contents of SOC,EOOC,WSOC,and AOC in the cultivation layer were lower in the buried ancient paddy soil than in the present cultivation paddy soil,and their average contents accounted for 51.86%,28.24%,40.12% and 34.17% of the present cultivation paddy,respectively,while no obvious difference was observed among the plow pan,the waterloggogenic horizon and the parent material horizon. The contents of WSOC,EOOC,and AOC accounted for0.45%,37.34%,16.39% of the total carbon in the cultivation layer in the buried ancient paddy soil,being 0.38%,10.93%,and 8.48% lower than that in the present paddy soil,respectively.The content of WSOC decreased with the increase of soil depth,while the contents of EOOC and AOC showed a trend of increase-decrease-increase. The SOC content in the cultivated horizon was28%-52% lower in the buried ancient paddy soil than in the present paddy soil,but that in the plow pan,waterloggogenic horizon and parent material horizon was higher in the ancient paddy soil than in the present paddy soil,indicating the organic carbon accumulated 3000 years ago still stored in the ancient paddy soil. These results suggest that the contribution of paddy wetland to soil organic carbon pool is relatively stable,playing an important role in global carbon cycling and the ecological and environmental protection.

关 键 词：埋藏古水稻土 水溶性有机碳 易氧化有机碳 活性有机碳 

分 类 号：S153.6[农业科学—土壤学]