The humus composition and distribution of Lake Wuliangsuhai sediment

以乌梁素海为研究对象,应用化学方法对乌梁素海湖泊表层沉积物有机质含量、腐殖质组成、影响腐殖质的环境因子及腐殖化程度进行了研究,结果表明:乌梁素海表层沉积物有机质含量变化范围为1.06%~5.38%.有机质分布特征与表层沉积物所处的水力条件、水生植物分布、人为活动有关;腐殖质组成中,胡敏酸含量为0.65~2.78 g/kg,富里酸含量为2.19~8.72 g/kg,胡敏素是主体,含量在3.28~20.92 g/kg之间;腐殖质与环境因子的相关性分析中,各组分含量与有机质含量呈极显著相关.pH值与胡敏素含量呈显著负相关.溶解氧与富里酸、胡敏素含量分别呈极显著正相关、显著正相关.腐殖化程度分析中,随着有机质含量的上升,可提取腐殖质的相对含量下降.PQ值介于9.50%~27.06%之间,平均值为21.47%,变异较大,且腐殖化程度较低.;The paper studied the organic matter contents,humus composition and the degree of humification of the surface sediment of Lake Wuliangsuhai by chemical method.Correlation between sediment humus and physical-chemical factors were also discussed.The results showed that the organic matter of the surface sediment varied from 1.06% to 5.38%.Their distribution characteristics were related to hydraulic condition,aquatic plant distribution and human activities.In the humus composition,the content of humic acid and fulvic acid varied from 0.65 to 2.78 g/kg and from 2.19 to 8.72 g/kg,respectively.The humin is the main component in the sediment,ranging from 3.28 to 20.92 g/kg.Based on the correlation analysis of humus and environmental factors, each component is significantly correlated with the organic matter content.The pH value is significantly negative correlated with humin.Dissolved oxygen is significantly positive correlated with fulvic acids and significantly positive correlated with humin.The organic matter content increased while the content of extracted humic substances is decreased in the humification analysis.The PQ values range from 9.50% to 27.06%,with the average of 21.47%,which varied dramatically and with low degree of humification.