暴雨过程中重庆雪玉洞地下河水文地球化学变化及碳汇量估算  

Hydrogeochemical Variations of Groundwater During a Rainstorm in Xueyu Cave,Chongqing and the Estimation of Its Carbon Sink

作　　者：王晓晓[1,2] 王凤康 徐尚全[1,2] 

机构地区：[1]西南大学地理科学学院,重庆400715 [2]三峡库区生态环境教育部重点实验室,重庆400715

出　　处：《西南大学学报（自然科学版）》2013年第12期97-103,共7页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41072192;41103068);重庆市国土与房管局科技项目

摘　　要：暴雨期间是研究地下河短期水文地球化学变化和在短时间尺度上进行地下河水体碳汇量估算的重要时期.为了监测暴雨期间雪玉洞地下河水化学变化和对碳汇量进行估算,利用CDTP 300在线监测地下河的水温、pH值、电导率、水位,利用BS28-VP2型野外小型气象站对雪玉洞附近的气温、降水进行记录.结果表明:雪玉洞地下河水化学类型为HCO3-Ca型,地下河pH值、电导率、水温等对2011年6月13日到15日的降雨过程有较快响应,响应时间约为4小时.受活塞效应的影响,电导率在降雨前期出现小幅上升;随着降雨量的增大,稀释效应起主导作用,电导率出现大幅下降.对已测指标的推算发现,降雨期间雪玉洞地下河的碳汇量显著增加,受流量增大的影响,DIC输送量增加15 191.987kg,二氧化碳分压随降雨量增加出现上升,CO2吸收量增加5 479.077kg.因此降雨过程引起的碳汇量增加应在进行碳汇估算时受到重视.The rainstorm period is a crucial stage for the study of the hydrology and geochemistry of the underground river and for the estimation of carbon sink of the buried river water body.The hydrology and geochemistry of the underground river in Xueyu cave was monitored from June 13to June 15,2011.The groundwater hydrochemistry type was found to be HCO3-Ca.The geochemistry parameters of pH,electric conductivity（EC）and water temperature responded to rainfall quickly,the lag being about 4hours.Affected by the piston effect,EC rose to a small extent during the prophase of rainfall;and then the dilution effect resulted in a marked decline in EC after the rainfall became heavy.The amount of DIC increased by 15 191.987kg and the increase of the absorbed carbon dioxide was 5 479.077kg.Therefore,the increase in the amount of carbon sink caused by the increased discharge during rainfall should be attached more importance to in the estimate of carbon sink.

关 键 词：暴雨 地下河 水文地球化学 碳汇 重庆雪玉洞 

分 类 号：P641.3[天文地球—地质矿产勘探] P641.134[天文地球—地质学]