广东英德宝晶宫CO2浓度的时空变化特征

于2011年12月至2013年4月每月一次对广东英德宝晶宫溶洞洞穴空气CO2浓度进行监测，结果显示洞穴空气CO2浓度存在明显的空间变化和季节变化。洞内空气CO2浓度在201×10-6?3 450×10-6之间变化，年平均值为1 018×10-6。在空间上，越靠近洞口或者通风效应越强的地方洞穴空气CO2浓度越低。在季节变化上，表现为洞穴空气CO2浓度在夏半年（5-10月）高而在冬半年（11-4月）低的特点。洞穴空气CO2浓度变化主要受洞穴通风效应和气候变化导致的植被呼吸作用和土壤微生物活动变化的影响。此外，宝晶宫特殊的洞穴结构及游客等因素也对该溶洞CO2浓度变化形成了一定的影响。

Spatio-Temporal Variation of Air CO2 Concentration in Baojinggong Cave, Guangdong, China

Monitoring of air CO2 concentration of Baojinggong Cave was carried out from December 15, 2011 to April 15, 2013. The results indicate that the cave air CO2 concentration showed notable spatial and seasonal variations. Monthly CO2 concentration of cave air varied from 201×10-6 to 3450×10-6 with an annual average of 1018×10-6. The CO2 concentration was higher in summer (from May to Octomber) and lower in winter (from November to next April). The sites closer to cave entrances, affected by strong cave ventilation, had lower CO2 concentration. The variation of cave air CO2 concentration was mainly influenced by cave ventilation and changes of vegetation respiration and soil microbial activity, which in turn were associated with changes in climate and environment. In addition, the special structure of Baojinggong Cave and tourists also contributed to the variation of cave air CO2 concentration.