贵州纳朵洞洞穴滴水理化特征及其石漠化响应

doi:10.16232/j.cnki.1001-4179.2019.11.008

摘要/Abstract

摘要： 2016年1~12月期间，选取气候条件一致、石漠化等级不同的纳朵洞主洞（地表潜在石漠化）及其附近小洞（地表中度石漠化）进行了1 a的监测，对比分析了不同强度石漠化条件下的洞穴滴水的理化指标(pH值、电导率EC、Ca2+与Mg2+等)及其洞穴环境特征（温度、CO2浓度）。研究结果表明：① 纳朵洞主洞及其附近小洞洞穴滴水的pH均值分别为7.8，8.2，夏季主洞CO2浓度是小洞的4~5倍，说明石漠化程度高的洞穴滴水pH值高于石漠化程度低的洞穴滴水，而洞穴的CO2浓度则相反。② 纳朵洞主洞洞内年平均气温16.6 ℃，而小洞观测点年平均气温为13.0 ℃，主洞（石漠化程度低）比小洞（石漠化程度高）更好地响应地表多年年均气温（16.2 ℃），石漠化程度高的洞穴气温和滴水的电导率较石漠化程度低的变幅大。③ 纳朵洞主洞及其附近小洞洞穴滴水的Ca2+质量浓度平均值变化范围分别为38~75 mg/L 和30~53 mg/L，说明石漠化程度低的洞穴滴水的Ca2+离子浓度相对偏高。

关键词: 洞穴滴水, 理化特征, 石漠化, 纳朵洞, 贵州省

Abstract: During the period from January to December in 2016, two caves with the same climatic conditions and different stony desertification levels (i.e., the Naduo cave in surface potential stony desertification level and the nearby small cave in moderate stony desertification level) were monitored for a year, and the physical and chemical indexes (pH value, conductivity, Ca2+ and Mg2+) of cave dripping water of the cave environment (air temperature and CO2 concentration in the cave) were compared and analyzed. The results show that:① the pH values of the dripping water in the Naduo cave and the nearby small cave are 7.8 and 8.2, respectively, the CO2 concentration in the Naduo cave in summer is 4~5 times higher than that of the small caves, indicating that the pH value of the dripping water in the cave of high stony desertification degree is higher than that of the cave of low stony desertification degree, while the CO2 concentration is the opposite.② The annual average temperature in the Naduo cave is 16.6 ℃, while the small cave is 13.0 ℃, indicating that the Naduo cave (low stony desertification degree) is better than the small caves (high stony desertification degree) in responding to the annual average temperature of 16.2 ℃ on the surface. In addition, the variation of cave temperature and dropping water conductivity in the cave of high stony desertification are larger than that of low stony desertification. ③ The average Ca2+ variation range of dripping water in the Naduo cave and the nearby small caves are 38~75 mg/L and 30~53 mg/L, respectively, showing that there is a difference in response to the external environment of the cave dropping water Ca2+ concentration in the different stony desertification level. The Ca2+ concentration of the dropping water in the low stony desertification cave is relatively high. To some extent, the Ca2+ of the dropping water can reflect the cave overlying vegetation, soil layer and rock layer thickness, and water-soil-rock reaction of the cave.

Key words: cave dripping water, physical and chemical characteristics, rock desertification, Naduo cave, Guizhou Province

王家录，李维杰，王建力，王红. 贵州纳朵洞洞穴滴水理化特征及其石漠化响应[J]. 人民长江, doi: 10.16232/j.cnki.1001-4179.2019.11.008.

WANG Jialu, LI Weijie, WANG Jianli, WANG Hong. Physical and chemical characteristics of dripping water in Naduo cave of Guizhou and its response to stony desertification[J]. , doi: 10.16232/j.cnki.1001-4179.2019.11.008.

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贵州纳朵洞洞穴滴水理化特征及其石漠化响应

Physical and chemical characteristics of dripping water in Naduo cave of Guizhou and its response to stony desertification

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