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为研究土壤-洞穴CO_2含量动态变化特征,选择织金洞及其岩溶表层3个样地进行监测。研究表明:土壤CO_2与洞穴CO_2变化规律具有一致性,均表现为春升、夏高、秋降,冬稳定的特征。夏季至秋季土壤-洞穴CO_2均呈上升趋势,土壤CO_2为0.13 mmol mol~(-1),洞穴CO_2为0.44 mmol mol~(-1),存在累积效应。织金洞为多进口洞穴,随着距洞口不断的深入,在灵霄殿至飞鸟觅食CO_2达到高值区为1.51 mmol mol~(-1),两端分别为:1.34 mmol mol~(-1)、1.05 mmol mol~(-1),呈现两端低中间高的分布趋势。织金洞上覆土壤CO_2含量是大气CO_2含量的22~27倍,是洞内CO_2含量的7~9倍。随着大气CO_2进入到土壤,土壤CO_2含量呈直线上升,直到60 cm处开始下降,经过基岩溶管、溶隙等进入洞穴内部。另一部分洞穴空气CO_2由大气降水-土壤水-洞穴水PCO_2转化而来,研究区为重碳酸盐钙型水和硫酸盐钙型水。研究发现:洞穴CO_2高值区自1月随时间变化分布特征为:中部→中部、前半段过渡带→前半段→前半段、中部过渡带→中部的迁移过程。这种新发现对喀斯特地区洞穴气候环境研究与洞穴开发保护具有重要的理论意义和实践指导价值。
In order to study the dynamic characteristics of soil-cave CO 2 content, three samples of Zhijin Cave and its karst surface were selected for monitoring. The results show that there is consistency between the variation of CO_2 and CO_2 in soil, which are characterized by spring up, summer high, fall down and winter stability. The soil-cave CO_2 in summer and autumn showed an upward trend with CO 2 0.13 mmol mol -1 and cave CO 2 0.44 mmol mol -1, which had a cumulative effect. The Zhijin Cave is a multi-entry cave. With the continuous deepening of the cave, CO_2 reached a high value of 1.51 mmol mol -1 in the Lingxiaodian to Asiatic birds, and the two ends were 1.34 mmol mol ~ (-1) 1), 1.05 mmol mol ~ (-1), showing a trend of low middle and high distribution at both ends. The content of soil CO_2 in Zhijindong Cave is 22 ~ 27 times of that of atmospheric CO_2, and 7 ~ 9 times of that in cave. With the atmospheric CO 2 entering the soil, the content of CO 2 in the soil increased linearly until it began to decline at 60 cm, and then entered into the cave through the karst karst pipe. The other part of the cave air CO 2 from the atmospheric precipitation - soil water - cave water PCO_2 transformed from the study area of bicarbonate calcium and calcium sulfate water. The results show that the distribution of CO 2 in high value area of the cave over time from January to January is characterized by the middle-middle part, the transitional part of the first half, the first half, the first half and the middle transitional zone. This new discovery has important theoretical significance and practical guiding value for the research on the cave climate and the development and protection of caves in the karst area.