贵州毕节石漠化地区洞穴上覆土壤与基岩对滴水元素特征的影响

发布时间：2019-05-18 16:56

【摘要】：通过对贵州毕节地区两个处于不同石漠化等级条件下的洞穴朝营洞(潜在)与韩家冲洞(强度)滴水的滴率与元素进行了为期1年的监测,分析了各洞穴上覆的土壤、基岩元素,探讨了滴水的元素来源及其石漠化效应.结果表明,朝营洞上覆土壤元素Ca、Mg、Sr含量高于韩家冲洞;朝营洞滴水Ca~(2+)、Mg~(2+)、Ba~(2+)、Sr~(2+)平均浓度分别为60.81、3.24、0.012、0.085 mg·L~(-1),韩家冲洞滴水分别为58.39、2.47、0.01、0.074 mg·L-1;地表石漠化程度越严重,洞穴滴水滴率对大气降雨的响应越敏感,季节变幅越大,滴水元素受到上覆基岩的贡献程度越高;受地表石漠化效应的差异影响,朝营洞滴水元素离子浓度呈现出雨季高旱季低的变化规律,而韩家冲洞滴水元素离子浓度呈现出雨季低,旱季高的变化规律.
[Abstract]:Based on the monitoring of drip rate and elements of Chaoying cave (potential) and Hanjiachong cave (intensity) in Bijie area of Guizhou for one year, the soil covered by each cave was analyzed. The source of dripping elements and the effect of rock desertification on bedrock elements are discussed. The results showed that the content of Ca,Mg,Sr in the overlying soil of Chaoying cave was higher than that of Hanjia cave. The average concentrations of Ca~ (2), Mg~ (2), Ba~ (2) and Sr~ (2) were 60.81, 3.24, 0.012, 0.085 mg 路L ~ (- 1) and 58.39, 2.47, 0.074 mg 路L ~ (- 1), respectively. The more serious the degree of rocky desertification on the surface, the more sensitive the dripping rate of cave to atmospheric rainfall, the greater the seasonal variation, and the higher the contribution of dripping elements to overlying bedrock. Under the influence of the difference of surface lithodesertification effect, the ion concentration of dripping elements in Chaoying cave showed the variation law of high dry season in rainy season, while the ion concentration of dripping elements in Hanjiachong cave showed the variation law of low rainy season and high dry season.
【作者单位】：贵州师范大学喀斯特研究院国家喀斯特石漠化防治工程技术研究中心;
【基金】：国家十三五重点研发计划课题(2016YFC0502607) 贵州省科技计划重大专项(黔科合重大专项字[2014]6007号) 贵州师范大学研究生创新基金项目(研创201518)~~
【分类号】：S151.9;P641.134

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