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选择了采自江苏省吴县市的黄泥土、乌泥土、白土等太湖地区代表性水稻土 ,测定了土壤有机碳的剖面分布、易氧化性碳分异、在土壤团聚体中的分布及 13 C稳定性同位素的剖面分异 .结果表明太湖地区水稻土中有机碳储量达 7～ 10 kg/m2 ,有机碳主要分布于 2～ 0 .2 5mm和 0 .2 5～0 .0 2 mm两级团聚体中 ,各土壤间有机碳的氧化活泼性接近 ,稳定性同位素组成类似 ,说明其有机碳地球化学性质趋向于与当前 C- 3农作物利用状况相平衡 .
The representative paddy soils, such as yellow soil, black soil and white soil, collected from Wuxian, Jiangsu Province, were selected to determine the distribution of soil organic carbon, the distribution of readily oxidizable carbon, the distribution in soil aggregates and the distribution of 13 C The results showed that the organic carbon storage in paddy soils of Taihu Lake region was 7 ~ 10 kg / m2, and the distribution of organic carbon was mainly in the range of 2 ~ 0.25 mm and 0.52 ~ 0. 02 mm In the aggregates, the organic carbon in each soil is close to oxidation and stable in isotopic compositions, indicating that its organic carbon geochemistry tends to balance with the utilization of current C-3 crops.