中国岩溶作用产生的大气CO_2碳汇的分区计算

Calculation of atmospheric CO_2 sink formed in karst progresses of the karst divided regions in China

根据中国岩溶碳汇计算的需要,将我国岩溶地区划分为南方岩溶区、北方岩溶区、青藏高原岩溶区和埋藏岩溶区4种类型区,各区的岩溶面积分别为56.48万km2、32.58万km2、55.60万km2和200.1万km2。各区岩溶水的径流模数和岩溶作用强度存在差异,南方岩溶区比其他区的岩溶作用强度明显大得多。以取得的调查监测和统计资料为依据,对4种类型区和中国的岩溶碳汇量进行了重新计算,南方岩溶区、北方岩溶区、青藏高原岩溶区和埋藏岩溶区岩溶碳汇量分别为1 909.9万tCO2/a、600.5万tCO2/a、580.1万tCO2/a、608.6万tCO2/a,由此获得中国岩溶碳汇总量为3 699.1万tCO2/a。该结果比前人的研究更全面地反映了当前我国岩溶地区碳水钙无机循环产生的大气CO2汇量。

In order to calculate the atmospheric CO2 sink formed in karst processes,the karst area of China can be divided into four types of karst regions-south China karst region,north China karst region,the Tibet plateau karst region and the buried karst region.The area of the above regions is 564 800 km2,325 800 km2,556 000 km2 and 2 001 000 km2 respectively.The karst water flow and the karstification degree in each region are different.Solution rate of the carbonate rocks in south China karst region is much bigger than that in the other three karst regions.Based on the data from recent geologic survey and statistics of the other research results,the atmospheric CO2 sinks formed in karst processes of the above-mentioned four karst regions are estimated as 1 909.9×104 tCO2/a,600.5×104 tCO2/a,580.1×104 tCO2/a and 608.6×104 tCO2/a respectively.Therefore,the total atmospheric CO2 sink formed in karst processes of China is 3 699.1×104 tCO2/a.This estimated result is more comprehensively to represent the present quantity of atmospheric CO2 sink formed in the inorganic carbon-water-calcium cycle in whole karst areas in China than that of the former other estimations.