摘要
为揭示洞穴上覆土壤CO_2的变化规律,探讨其变化对洞内滴水水化学的影响,通过对织金洞上覆4处不同深度土壤CO_2浓度和洞内3处常年滴水水化学指标进行一年的监测分析.结果显示,织金洞上覆不同深度的土壤CO2浓度具有明显的夏季高、冬季低的特征.总体上随着土层深度的增加土壤CO2浓度呈上升趋势,除ZJ1#外;由于受气温、降水、土壤有机物氧化分解、土壤微生物活动、植物根系呼吸作用和大气CO_2的扩散输入等因素的影响,不同监测点土壤CO_2浓度具有明显的差异;受土壤CO2效应的影响,不同滴水点水化学存在明显差异,ZJDS1#Ca^(2+)、HCO^(-3)、EC和lgP_(CO_2)(w)均呈现明显夏秋高、冬春低的特点,pH、Mg^(2+)、Sr^(2+)、和SIc相反.而与洞外环境响应较缓慢的ZJDS2~#和3~#季节变化相对较弱;整体上洞穴滴水的方解石饱和指数均>0,Ca^(2+)处于饱和状态,表明织金洞洞内现代沉积物可能仍处于生长阶段.通过洞穴上覆土壤CO_2与洞穴滴水水化学的关系研究,为洞穴风化景观及次生沉积物景观的恢复和保护提供一定的科学依据.
To explore the CO2 concentration of the overlying soil impact on the drip water chemistry,which its variation must be revealed. Monitoring of soil CO2 concentration which in different depths and hydrochemistry of perennial drip waters in Zhijin Cave was carried out from January to December in 2015. The results indicate that soil CO2 concentration with different depths in Zhijin Cave was higher in summer and lower in winter. In general,soil CO2 concentration increased with depth in most cases, except ZJ1#; The soil CO2 concentration was influenced by air temperature,precipitation,soil organic matter oxidation and decomposition,soil microbial activity,plant root respiration and the diffusion of atmospheric CO2 and other factors,so there were obvious differences at different monitoring sites; Influenced by soil CO2 effect, there were obvious differences at hydrochemistry of different water sites. Ca（2＋）,HCO（-3）,EC and lgP（CO2）（w）of ZJDS1#were higher in summer-autumn and lower in winter-spring. pH,Mg（2＋）,Sr（2＋）and SIc were the opposite of that; The seasonal variations of ZJDS2# and ZJDS3# which with slow response to outside environment were relatively weak. On the whole,the saturation index of calcite in cave drip water is above zero,and Ca（2＋）is saturated. It shows that the modern sediments in the Zhijin Cave may still be in the growth stage. Through the study of the relationship between soil CO2 and the hydrochemistry of drip waters in Zhijin Cave,it can provide scientific basis for the restoration of the weathered landscape and the protection of the secondary sediment landscape.
作者
张结
周忠发
潘艳喜
曹明达
殷超
ZHANG Jie ZHOU Zhongfa PAN Yanxi CAO Mingda YIN Chao(School of Karst Science, Guizhou Normal University, Guiyang, 550001, China The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou, Guiyang, 550001, China State Engineering Technology Institute for Karst Rock Desertification Control, Guiyang, 550001, China)
出处
《环境化学》
CAS
CSCD
北大核心
2017年第10期2235-2245,共11页
Environmental Chemistry
基金
国家自然科学基金地区项目(41361081)
贵州省科技计划(黔科合G字[2014]4004-2号)
贵州省重大应用基础研究项目(黔科合JZ字[2014]200201)资助~~
