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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.
Taking the different types of eutrophic Wuliangsuhai and Daihai as objects, the morphological characteristics of organic carbon in lacustrine sediments were studied, and the morphological characteristics and differences of organic carbon in two lake sediments were analyzed.The results show that the Wuliangsuhai The content of total organic carbon (TOC) in sediments ranged from 4.50 to 22.83 g.kg-1 with an average of 11.80 g · kg-1. The content of recombinant carbon (HFOC) ranged from 3.38 to 21.67 g.kg-1 with an average of 10.76 g. kg-1. The content of light carbon (LFOC) ranged from 0.46 to 1.80 g · kg-1 with an average of 1.04 g · kg-1. The content of ROC was 0.62 ~ 3.64 g · kg-1 with an average of 2.11 g.kg-1. The content of TOC in sediments of Daihai ranged from 6.84 to 23.46 g.kg-1 with an average of 14.94 g.kg-1, and the content of HFOC ranged from 5.27 to 22.23 g.kg-1 with an average of 13.89 g .kg-1. The content of LFOC ranged from 0.76 to 1.57 g.kg-1 with an average of 1.05 g.kg-1. The ROC content ranged from 1.54 to 7.08 g.kg-1 with an average of 3.62 g.kg-1.2 lakes The contents of TOC and HFOC in the sediments of Wuliangsuhai Sea are all lower than that of Daihai Lake, and the contents of LFOC in the two lakes are similar, but the contents of LFOC in the sediments of Wuliangsuhai Sea TOC mass fraction higher than Daihai .2 lakes table Sediment humus (HS) was dominated by humin (HM) followed by fulvic acid, HM content in the surface sediments of Wuliangsuhai ranged from 43.06% to 77.25% with an average of 62.15% The mass fraction of HM in the total amount of HS was between 49.23% and 73.85%, with an average of 65.30% .Compacted state was the dominant form of humus in the sediments of the two lakes, followed by the loosely knotted state.The tight knot of Wuliangsuhai surface sediment Accounting for 59.17% -67.92% of the total humus content, with an average of 67.92%. The tight junction in the Daihai surface sediments accounted for 65.49% -81.04% of the total humus content, with an average of 66.38% .In general, However, PQ value, LFOC / TOC, elastic ratio and HA / FA of different binding forms revealed that the organic matter in the Wuliangsuhai sediments had a lower degree of humification and a higher humus activity. The Wuliangsuhai sediments Less carbon pool Daihai stable.