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以桂林毛村地下河为对象,研究了外源水对岩溶碳汇的影响。观测计算结果表明:外源水进入岩溶区后,由于内外源水相互混合,提高了岩溶水的溶蚀能力,以致DIC含量不断升高,其碳酸盐饱和指数也逐渐增加,SIc由不饱和达到饱和,增加了岩溶碳汇的通量。2010年9月至2011年3月仅以位于地下河上游的小龙背的外源水补给量和地下河出口的HCO3-浓度进行计算,岩溶碳汇通量由2.28×105 g增加至2.04×106 g,增加了近10倍。碳汇通量的增加固然与沿途大气降水、植被及土地利用等可能产生的CO2输入有关,但更与外源水加入形成的混合溶蚀作用有关。因此,在岩溶碳汇通量计算中外源水的影响作用不容忽视。
Taking Guimaolin Maocun underground river as an example, the influence of exogenous water on the carbon sequestration was studied. The results of observation and calculation show that after the exogenous water enters the karst area, the dissolution of karst water increases due to the mixing of the exogenous and the exogenous water, so that the DIC content increases continuously, and the carbonate saturation index gradually increases, and the SIc reaches from unsaturated Saturated, increasing the flux of karst carbon sink. From September 2010 to March 2011, only the recharge quantity of exogenous water and the concentration of HCO3- at the underground river outlet of Xiaolonggong at the upper reaches of the underground river were calculated, and the flux of carbon sequestration increased from 2.28 × 105 g to 2.04 × 106 g , An increase of nearly 10 times. Although the increase of carbon flux is related to the CO2 input that may be generated by atmospheric precipitation, vegetation and land use along the route, it is more related to the mixed erosion formed by the addition of exogenous water. Therefore, in the calculation of karst carbon flux flux of foreign water can not be ignored.