摘要
在测定了伊春河不同季节河水溶解态有机碳（ＤＯＣ）含量和流量的基础上，探讨了ＤＯＣ含量与流量的关系和时空变化规律，并计算了伊春河ＤＯＣ输出通量。研究结果表明，非冰封期伊春河ＤＯＣ主要来自外源，其含量从上游至下游逐渐升高。ＤＯＣ含量和变速均与流量密切相关，但较流量波动滞后约８ｈ。据此建立的双曲线方程可用来估算ＤＯＣ含量和输出通量。在伊春河封冻之后，外源被完全阻断，河水ＤＯＣ含量仅受内源控制，因而与流量成反比。据计算，伊春河ＤＯＣ年输出通量为７１１３ｔ，相当于２．８８ｇＣ／ｍ２。其中９０％以上集中在雨季的５个月中。
The contents of dissolved organic carbon (DOC) and the flow of Yichun River were determined and the spatial and temporal variations in DOC content and flux were studied. It was found that in the summer, DOC is originated primarily from the allochthonous sources and the content of DOC increases downstream. There is a synchronous fluctuation of DOC contents and flow with a 8 hour delay of the former. A hyperbolic equation can fit the data well and is able to predict the DOC content and flux based on flow measurements. During the winter season when the river is totally covered by ice, the autochthonous source becomes dominant and the DOC content is negatively correlated to flow due to dilution effect. The DOC flux of the river was calculated to be 7 113 ton/yr, or 2.88 gC/m 2·yr, among which over 90% occurs during the 5 months in the wet season.
出处
《地理学报》
EI
CSSCI
CSCD
北大核心
1997年第3期254-261,共8页
Acta Geographica Sinica
基金
国家杰出青年基金
国家自然科学基金
