【摘要】 2010年6月13日至6月17日期间,对桂林毛村岩溶地下河出口HCO-3与流量对降雨的响应进行了高分辨率的监测,实时监测降雨量和地下河出口河水水位、水温、pH值、电导率、重碳酸根,结合计算地下河水方解石饱和指数(SIc)与二氧化碳分压(pCO2)的基础上,分析了降雨条件下岩溶碳汇的动态变化特征。相关数据表明,(1)岩溶地下河水位、水温与流量随降雨强度暴涨暴落,其pH值、HCO-3、SIc与pCO2对降雨响应迅速;(2)降雨后岩溶作用产生的碳汇量明显增加,并随降雨强度的不同而变化;(3)通过旱季与雨季毛村地下河出口碳汇通量对比发现,岩溶作用对大气CO2与土壤CO2的吸收(岩溶碳汇)随季节而变化,总体表现为雨季大于旱季,雨季岩溶作用产生的CO2汇增加了约两倍,研究表明岩溶区存在较大的固碳增汇潜力。更多还原

【Abstract】 We had high resolution monitor on the HCO-3and Flux in response to the rainfall of Maocun subterranean river in Guilin on June 13～17,2010.Measured the precipitation,water level,water temperature,pH,EC(electrical conductivity) and HCO-3(bicarbonate) by CTDP300,Based on the SIc(saturation index) and pCO2(carbon dioxide partial pressure),analyzed the dynamic behaviors of karst carbon sink in rainfall.Relevant data shows that the water stage,flow and water temperature change with the rainfall.HCO-3,pH,SIc and pCO2 are in response to rainfall quickly.Karst carbon sink increased after rainfall and changed with the rainfall intensity.Furthermore,according to the contrast result of carbon sink between March 7,2010 and June 13,2010 of Maocun subterranean river,we find that carbon sink increased approximately two times after rainfall,carbon sink changes with different seasons,generally,rainy season’s carbon sink is more than dry season,the results present that karst areas have a potential carbon sequestration.更多还原