土壤CO_2与喀斯特洞穴CO_2季节变化响应分析  

Seasonal Response Between Soil CO_2 and Karst Cave CO_2 Concentration

作　　者：殷超[1,2] 周忠发[1,2] 田衷珲 曹明达[1,2] 张结[1,2] 潘艳喜 汪炎林 

机构地区：[1]贵州师范大学喀斯特研究院,贵阳550001 [2]贵州省喀斯特山地生态环境国家重点实验室培育基地,贵阳550001

出　　处：《水土保持学报》2017年第4期304-310,337,共8页Journal of Soil and Water Conservation

基　　金：国家自然科学基金地区项目"岩溶洞穴CO2迁移变化机制及对洞穴岩溶环境的影响研究"(41361081);贵州省高层次创新型人才培养计划项目--"百"层次人才(黔科合平台人才[2016]5674);贵州省科技计划项目"贵州省洞穴调查数据技术服务"(黔科合G字[2014]4004-2号);贵州省重大应用基础研究项目"喀斯特石漠化生态修复及生态经济系统优化调控研究-岩土类型格局"(黔科合JZ字[2014]200201)

摘　　要：为了揭示土壤CO_2对洞穴内环境的意义,对大风洞和响水洞2016年洞内环境指标和上覆土壤的相关数据进行统计与回归分析。结果表明,洞内CO_2浓度、土壤CO_2浓度具有显著的季节性特征,土壤2#对应的洞内空气CO_2在夏冬两季差值达793~884mg/kg。土壤水PCO_2和滴水PCO_2在夏冬两季的差值最高可分别达1.12和0.41,因此洞内滴水PCO_2、土壤水PCO_2也表现出明显的季节性特征。土壤CO_2、洞内空气CO_2、洞内滴水PCO_2和土壤水PCO_2间均表现出一定的滞后现象,如4#土壤水PCO_2与滴水PCO_2的相关系数,由非滞后条件下的0.123上升至滞后条件下的0.596。同时在滞后条件下,土壤CO_2对洞内CO_2的贡献率的总和最高可达84.6%,高于非滞后条件下的值。In order to reveal the significance of soil CO2 on cave environment,statistical and regression analysis were conducted on the related data of the cave environmental indexes and the overlying soil properties in2016.The results showed that the cave air CO2 concentration and soil CO2 concentration presented the significant seasonal variation and obvious hysteresis phenomenon.The difference between summer and winter of cave air CO2 concentration corresponded with soil 2# was 793-884 mg/kg.The highest differences of soil water PCO2 and drip water PCO2 between summer and winter were 1.12 and 0.41 respectively.So the drip water PCO2 and soil water PCO2 also showed obviously seasonal variations.The lag phenomenon was shown among soil CO2,cave air CO2,drip water PCO2 and soil water PCO2,e.g.,the coefficients between soil water PCO2 and drip water PCO2 were improved from 0.123 without hysteresis to 0.596 with hysteresis.Under the hysteresis,the highest total contribution of soil CO2 concentration to cave air CO2 concentration was 84.6%,higher than that without hysteresis.

关 键 词：喀斯特 二氧化碳 滴水PCO2 多元回归分析 双河洞 

分 类 号：P642.25[天文地球—工程地质学]