中文摘要：

以富营养化类型不同的乌梁素海和岱海为对象,开展湖泊沉积物中有机碳的形态特征研究,对比分析了2个湖泊沉积物有机碳的形态特征及其差异性.结果表明,乌梁素海沉积物中总有机碳（TOC）含量范围为4.50～22.83 g.kg-1,平均11.80g.kg-1;重组碳（HFOC）含量范围为3.38～21.67 g.kg-1,平均10.76 g.kg-1;轻组碳（LFOC）含量范围为0.46～1.80 g.kg-1,平均1.04 g.kg-1;易氧化碳（ROC）含量范围为0.62～3.64 g.kg-1,平均2.11 g.kg-1.岱海沉积物中TOC的含量范围为6.84～23.46 g.kg-1,平均14.94 g.kg-1;HFOC的含量范围为5.27～22.23 g.kg-1,平均13.89 g.kg-1;LFOC的含量范围为0.76～1.57 g.kg-1,平均1.05 g.kg-1;ROC的含量范围为1.54～7.08 g.kg-1,平均3.62 g.kg-1.2个湖泊沉积物中的TOC均以HFOC为主,HFOC对TOC的积累有重要作用.乌梁素海沉积物中TOC和HFOC含量均低于岱海,2个湖泊LFOC含量相近,但乌梁素海沉积物中LFOC占TOC的质量分数高于岱海.2个湖泊表层沉积物腐殖质（HS）均以胡敏素（HM）为主,富里酸次之.乌梁素海表层沉积物中HM占HS总量的质量分数介于43.06%～77.25%,平均62.15%;岱海表层沉积物中HM占HS总量的质量分数介于49.23%～73.85%,平均65.30%.紧结态为2个湖泊沉积物腐殖质的主导形态,松结态次之.乌梁素海表层沉积物中紧结态占腐殖质总量的59.17%～67.92%,平均67.92%;岱海表层沉积物中紧结态占腐殖质总量的65.49%～81.04%,平均66.38%.总体上,2个湖泊沉积物碳库均为相对稳定碳库,但PQ值、LFOC/TOC、松紧比以及不同结合形态的HA/FA均揭示,乌梁素海沉积物有机质的腐殖化程度较低,腐殖质的活性较高,乌梁素海沉积物碳库不及岱海稳定.

英文摘要：

The characteristics and differences of organic carbon forms in the sediments of the Wuliangsuhai and the Daihai Lakes with different eutrophication types were discussed in the present study.The results showed that the range of total organic carbon content（TOC） in Wuliangsuhai Lake was 4.50-22.83 g.kg-1 with the average of 11.80 g.kg-1.The range of heavy-fraction organic carbon content was 3.38-21.67 g.kg-1 with the average of 10.76 g.kg-1.The range of light-fraction organic carbon content was 0.46-1.80 g.kg-1 with the average of 1.04 g.kg-1;The range of ROC content was 0.62-3.64 g.kg-1 with the average of 2.11 g.kg-1,while the range of total organic carbon content in Daihai lake was 6.84-23.46 g.kg-1 with the average of 14.94 g.kg-1.The range of heavy-fraction organic carbon content was 5.27-22.23 g.kg-1 with the average of 13.89 g.kg-1.The range of light-fraction organic carbon content was 0.76-1.57 g.kg-1.The range of ROC content was 1.54-7.08 g.kg-1 with the average of 3.62 g.kg-1.The results indicated that the heavy-fraction organic carbon was the major component of the organic carbon and plays an important role in the accumulation of organic carbon in the sediments of two Lakes.The content of light-fraction organic carbon was similar in the sediments of two lakes,whereas,the contents of total organic carbon and heavy-fraction organic carbon in the sediment of Wuliangsuhai Lake were less than those in the sediment of Daihai Lake,and the value of LFOC /TOC in the Wuliangsuhai Lake was larger than that in the Daihai Lake.The humin was the dominant component of the sediment humus,followed by fulvic acid in the two lakes.The values of HM /HS in the sediments of Wuliangsuhai lake range from 43.06% to 77.25% with the average of 62.15% and values of HM /HS in the sediments of Dahai lake range from 49.23% to 73.85% with the average of 65.30%.The tightly combined humus was the dominant form in the sediment humus of two lakes,and the followed was loosely combined humus.As a whole,the carbon storage of two lakes wer