新疆博斯腾湖湖周水体碳和盐离子的空间分布

Spatial Distributions of Organic Carbon and Dissolved Ions in the Bosten Lake,Xinjiang

以博斯腾湖为研究对象,在大湖区周边及开都河取水样和表层土样,分析湖周水体中颗粒有机碳(POC)和溶解有机碳(DOC)在秋季的空间分布特征及其与周围土壤碳及水体盐离子的关系。结果表明:湖周水体中POC浓度的空间变化较大(0.1～1.2mg.L-1),而DOC浓度的变化较小(8.5～12.3mg.L-1)。两者在出湖口和入湖口处的浓度均较低,与开都河的浓度相近。与早期相比,博斯腾湖水中无机碳存在由CO23-向HCO3-转化的现象。回归分析显示,水体中各形态碳与土壤碳之间没有显著的线性关系,表明水体中碳的含量受周围土壤的影响不大。

In order to study the spatial distribution of organic carbon, some water and topsoil samples were collected in and around the Bosten Lake in Xinjiang, China in November 2011. Particulate organic carbon （ POC ） , dissolved organic carbon （DOC） and dissolved ions in water samples, and organic and inorganic carbon contents in soil samples were measured. The results showed that there was a wide range of POC （0.1 - 1,2 mg. L^-1 ） but a narrow one of DOC （8.5 - 12.3 mg . L^-1 ） in the Bosten Lake. Concentrations of POC and DOC near the inlet and outlet of the lake were similar to those in the Kaidu River, but much lower than the average values of the lake. Our analysis suggested that there might be a transformation of CO3^2- to HCO3^- in the Bosten Lake in recent 30 years. There was no significant correlation between soil carbon content and POC or DOC, which suggested that the effect of soil on carbon content in Bosten Lake water was not significant.