岩溶洞穴滴水氢氧稳定同位素时空变化特征及其指示意义  

Spatiotemporal Variations of Hydrogen and Oxygen Stable Isotopes of in Karst Cave Drip Water and Their Indicative Significance

作　　者：张叶 周忠发[1,2] 董慧 丁圣君 龚晓欢 苏丹 王小朵 郑佳佳 ZHANG Ye;ZHOU Zhongfa;DONG Hui;DING Shengjun;GONG Xiaohuan;SU Dan;WANG Xiaoduo;ZHENG Jiajia(School of Geography and Environmental Science/School of Karst Science,Guizhou Normal University,Guiyang 550001,China;The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province,Guiyang 550001,China)

机构地区：[1]贵州师范大学地理与环境科学学院/喀斯特研究院,贵阳550001 [2]贵州喀斯特山地生态环境国家重点实验室培育基地,贵阳550001

出　　处：《地球与环境》2024年第4期397-408,共12页Earth and Environment

基　　金：国家自然科学基金项目(42161048);贵州省科技计划项目(黔科合基础-ZK[2023]一般258);贵州省科技计划项目(黔科合中引地[2023]005)。

摘　　要：为探究麻黄洞滴水δD、δ^(18)O时空变化特征及其指示意义,本文对双河洞系一级支洞麻黄洞中4个滴水点进行系统监测分析,4个监测点分为2个Ⅰ类(低流量点)和2个Ⅱ类(高流量点)。研究得出:(1)洞穴滴水δD、δ^(18)O值表现出旱季高、雨季低的变化特征。(2)低流量滴水点的δ^(18)O及离子的变化均较小,对外界气候的响应较小;高流量点中又有渗滤流和包气带流之分,渗滤流滴水点对外界气候无明显响应,推断其有稳定的含水层补给;包气带流滴水点δ^(18)O值与气温、降雨量的相关性最大,能很好地响应气候的变化。本研究通过阐述麻黄洞滴水δD、δ^(18)O时空变化特征及其水化学特征,以期对洞穴沉积物古气候重建提供参考依据。In order to explore the spatiotemporal variations and indicative significance ofδD andδ^(18)O in drip water from Ma'huang Cave,this study systematically monitored and analyzed four drip points within the primary branch of the Shuanghe Cave system.The monitored points were catagorized into two Class I(low-flow)and two Class II(high-flow)types.The findings are as follows:(1)Drip waterδD andδ^(18)O values exhibit a pattern of higher values in the dry season and lower values in the rainy season.(2)Drip points with low flow rates show smaller variations inδ^(18)O and ions,indicating a lesser response to external climatic conditions;among the highflow points,there are distinctions between percolation flow and vadose zone flow—drip points of percolation flow exhibit minimal response to external climate,suggesting a stable groundwater recharge,whereas drip points of vadose zone flow show the highest correlation betweenδ^(18)O values and temperature/precipitation,effectively reflecting climatic changes.This study aims to detail the spatiotemporal variations ofδD andδ^(18)O in Ma'huang Cave drip water along with their hydrochemical characteristics,which could prove useful in providing a reference basis for paleoclimate reconstruction from cave sediments.

关 键 词：洞穴滴水 氢氧稳定同位素 气候指示 水化学 

分 类 号：P59[天文地球—地球化学]