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岩溶地下河系统在无雨条件下,秋季短时间尺度(10日左右)内其出口处水化学动态具有显著的日周期,连续功率谱及交叉功率谱分析可以识别这一周期。文章以茂兰自然保护区板寨地下河系统出口为研究对象,运用频谱分析方法对2007年10月中旬无雨条件下10日左右连续监测的气象要素、水化学数据进行研究,发现植被覆盖良好的岩溶地下河系统,出口处水化学动态呈现日动态变化周期,表现为白天气温升高,水的pH值升高,二氧化碳分压、电导率和方解石饱和指数降低,其中pH值对气象要素的响应最为敏感,二氧化碳分压对水温的响应最为敏感。
Under the condition of no rainfall, karst subsurface river system has a significant daily cycle at its outlet at the short time scale (about 10 days). The continuous power spectrum and cross power spectrum analysis can identify this cycle. The article takes the export of Banzhai underground river system in Maolan Nature Reserve as the research object, and uses the spectral analysis method to study the meteorological elements and water chemistry data continuously monitored around 10 days in no rain in mid-October 2007, and found that the vegetation coverage is good Of the karst underground river system, the export of water chemical dynamics showed a dynamic change cycle, showing the daytime temperature increases, the water pH, carbon dioxide partial pressure, conductivity and calcite saturation index decreased, of which pH value of meteorological elements Of the response is the most sensitive, partial pressure of carbon dioxide on the water temperature response is the most sensitive.