第二松花江干流底泥有机无机复合体组成及有机碳分布特征

以第二松花江干流为对象,研究其底泥有机无机复合体的组成及有机碳分布的差异,同时分析底泥有机无机复合体组成及其有机碳分布与岸边土壤之间的关系。结果表明:底泥与岸边土壤在有机无机复合体组成、有机碳分配和腐殖质组成方面表现出较好的一致性,说明岸边土壤对底泥的有机碳组成和分布有显著贡献。底泥的中央粒径呈现上游高、下游低的特点,抚松底泥中央粒径为200μm,吉林底泥中央粒径在70μm左右,榆树、松原底泥中央粒径在50μm左右;底泥的有机碳和腐殖酸含量也表现出上游高于下游的特点。底泥有机无机复合体组成以砂粒复合体为主,黏粒、粉粒复合体含量次之;并且随着复合体粒径的增加,有机碳含量减少。底泥HA/FA均大于1,从上游至下游表现为抚松>吉林>榆树>松原;底泥HA/FA均小于岸边土壤。

Organic Mineral Complex Component and Distribution Character of Organic Carbon in Sediments form the Second Songhua River

The organic mineral complex component and the distribution character of organic carbon in sediments from the main stream of the second Songhua river were selected in the study.The research analyzed the relationship between the composition of organic mineral complex and the spatial distribution character of organic carbon in sediments and the shoreside soil.The results showed that the composition of organic mineral complex,the distribution character of organic carbon and the composition of humic substances in the sediment and the shoreside soils had a better consistency.It showed that soil had a significant contribution to the composition and distribution of sediments.The central grain size of sediments presented that the upper reaches were much more than that of the lower reaches.The central grain size of sediment from Fusong was 200 μm.The central grain size of sediment from Jilin was about 70 μm.The central grain size of sediments from Yushu and Songyuan were approximately 50 μm.The contents of organic carbon and humic substances also showed that the upper reaches were much more than that of the lower reaches.Organic mineral complex in sediments primarily was composed by the sand organic mineral complex,next clay’s and silt’s.With increasing of the grain size of organic mineral complex,the contents of organic carbon decreased.The ratio of HA and FA in sediments was all much more than 1.Form the upper reaches to the lower reaches,the ratio of HA and FA in sediments followed the order of Fusong >Jilin >Yushu >Songyuan.The ratio of HA and FA in sediments was less than that of shoreside soil.