CAJ | 학술논문

为了探讨芙蓉洞现代沉积物沉积速率和微量元素(Mg,Sr)的变化特征、控制机制以及气候环境指示意义,于2010年11月到2013年11月对芙蓉洞5个滴水点进行连续现场监测,并采集现代沉积物样品进行沉积速率计算和微量元素测定。结果显示：(1)芙蓉洞5个滴水点的现代沉积物沉积速率与滴量、pH、Ca2+浓度以及 P CO 2等指标的关系表现出多样性。其中 MP4和 MP5的沉积速率均与滴量呈正相关(r=0.75,n=11,p<0.01；r=0.63,n=11,p<0.05),两个滴水点的沉积速率整体表现出雨季高、旱季低的变化规律,表明 MP4和 MP5的沉积作用主要发生在雨季,其沉积速率的变化可以对季节性干湿度变化做出响应。(2)2012-2013年年降水量明显增加,在稀释作用、水岩作用以及植物对元素差异性吸收作用的影响下,各滴水点现代沉积物整体呈现出 Mg 浓度减小而 Sr 浓度增大的趋势,Mg/Ca 和 Sr/Ca 比值呈反相关关系,它们响应了年际尺度上降水量增加的气候信息。
위료탐토부용동현대침적물침적속솔화미량원소(Mg,Sr)적변화특정、공제궤제이급기후배경지시의의,우2010년11월도2013년11월대부용동5개적수점진행련속현장감측,병채집현대침적물양품진행침적속솔계산화미량원소측정。결과현시：(1)부용동5개적수점적현대침적물침적속솔여적량、pH、Ca2+농도이급 P CO 2등지표적관계표현출다양성。기중 MP4화 MP5적침적속솔균여적량정정상관(r=0.75,n=11,p<0.01；r=0.63,n=11,p<0.05),량개적수점적침적속솔정체표현출우계고、한계저적변화규률,표명 MP4화 MP5적침적작용주요발생재우계,기침적속솔적변화가이대계절성간습도변화주출향응。(2)2012-2013년년강수량명현증가,재희석작용、수암작용이급식물대원소차이성흡수작용적영향하,각적수점현대침적물정체정현출 Mg 농도감소이 Sr 농도증대적추세,Mg/Ca 화 Sr/Ca 비치정반상관관계,타문향응료년제척도상강수량증가적기후신식。
To explore the variation,control mechanism and environmental significance of deposition rates and elements in the recent sediments under drip water in the Furong cave,Chongqing,five drip sites were moni-tored continuously from November 2010 to November 2013,and recent sediments were collected for the dep-osition rate calculation and determination of trace elements.The results show distinct correlations among the deposition rates and the discharges of drip water,pH,Ca concentration,PCO 2 of the five drip sites.The deposition rates of MP4 and MP5 are both positively correlated with their discharges of drip water (r=0.75, n=1 1,p<0.01;r=0.63,n=1 1,p<0.05,respectively),and the deposition rates of the two drip sites ex-hibit obvious variations,high in rainy seasons while low in dry seasons.The deposition of MP4 and MP5 oc-cur mainly in rainy seasons.The changes of their deposition rates can indicate the dry and humid changes of the outside environment.The annual precipitation increased during 2012-2013.Under the influence of dilu-tion effect,water-rock interaction and different absorptions of plants for elements,the concentration of Mg decreased while the Sr concentration increased.At the same time,the Mg/Ca is negatively correlated with the Sr/Ca.They can respond to the increasing of the precipitation on the interannual time scale.