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青海湖的无机碳收支

, PP. 1162-1168

Keywords: 碳循环,无机碳,化学风化,碳酸盐沉淀,青海湖

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Abstract:

在全球碳循环中,包括湖泊在内的内陆水体起着十分重要的作用,日益受到关注。面对我国湖泊碳收支状况所知甚少的现状,通过青海湖这一典型湖泊现代溶解无机碳(DIC)输入和沉积物组成的调查和分析,初步评价了青海湖无机碳收支的平衡及其可能控制因素。结果表明,受碳酸盐风化制约,青海湖流域的河水、大气降水和地下水的离子组成均以Ca2+和HCO-3占主导。在占主要贡献的河水中,布哈河(流域最大河流)贡献了其中一半的DIC。与只有约4%左右贡献的地下水相比,大气降水输入了近30%的DIC。近50年来,湖泊沉积物的碳累积速率主要取决于布哈河雨季输入的DIC通量变化。目前处于碳酸盐过饱和的青海湖湖水,将由碳酸盐风化带入湖泊的DIC通过自生碳酸盐沉淀迅速转入沉积物,对大气CO2没有直接的消耗。然而,青海湖湖水的碳并不处在一个稳定的状态,碳酸盐过饱和的湖水则很可能作为大气CO2的源,HCO-3中的碳将随着湖泊水位的下降和温度的升高返回到大气中。

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