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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。
In order to find out the distribution and variation of different forms of organic carbon in buried ancient paddy soil, the differences of soil organic carbon, readily oxidizable organic carbon, water-soluble organic carbon and active organic carbon in burial ancient paddy soil and modern paddy soil were studied. And profile distribution features. The results showed that the content of organic carbon, water-soluble organic carbon, organic carbon and organic carbon in burial ancient paddy soil was lower than modern paddy soil, only 51.86%, 28.24% and 40.12% And 34.17% respectively, while the contents of plow bottom layer, parental layer and parent layer were less than those of modern paddy soil. The contents of water-soluble organic carbon, organic carbon and active organic carbon 0.45%, 37.34% and 16.39% of the total carbon, which are 0.38,10.93 and 8.48% lower than the average content of modern paddy soil. The content of water-soluble organic carbon decreases with the depth of soil layer, and the contents of readily-oxidizable organic carbon and active organic carbon The organic carbon accumulated in 3000 years ago remains in the buried ancient paddy soil. Although the content of tillage layer is 28% -52% lower than modern paddy soil, Layers and parent material is higher. It indicates that the contribution of paddy field wetland to soil carbon pool is relatively stable and plays an important role in the global carbon cycle and ecological environment protection.