土壤CO_2浓度与地表CO_2通量的季节变化及其相互关系  

Seasonal Variation and Relationship Between Soil CO_2 Concentrations and Surface CO_2 fluxes

作　　者：程建中[1] 李心清[1] 周志红[1,2] 王兵[1] 程红光[1] 邢英[1,2] 唐源[1,2] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002 [2]中国科学院研究生院,北京100049

出　　处：《地球与环境》2011年第2期196-202,共7页Earth and Environment

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-306-3);国家自然科学基金(40872212);国家重点基础研究发展规划(973)项目(2006CB403205)

摘　　要：采用气相色谱法对贵州喀斯特地区不同土地利用方式土壤剖面CO2浓度与地表CO2通量的季节变化特征进行为期一年的观测。结果表明:土壤CO2浓度和地表CO2通量具有明显的季节变化规律,均表现为:从春季到夏季浓度和通量逐渐增加,而从秋季到冬季浓度和通量又逐渐降低,这与该区域的温度和降雨量变化趋势一致。不同土地利用方式土壤CO2浓度和地表CO2通量与大气、土壤各层温度呈显著正相关关系,土壤湿度虽然也在一定程度上影响了剖面CO2浓度和地表通量,但二者之间并无显著相关性。相关性分析表明土壤CO2浓度和地表CO2通量之间呈显著的正相关关系,说明地表CO2排放强烈依赖于土壤CO2浓度积累和分布。Seasonal variations in the concentrations of soil air CO2 and surface CO2 fluxes under different land uses were studied in the karst regions of Guizhou by GC technique for one year.The results showed that the seasonal variation regularities of soil CO2 concentrations and surface CO2 fluxes were very obvious,i.e.,increasing from spring to summer and decreasing from autumn to winter in response to temperature and precipitation changes in this region.Subsurface CO2 concentrations and surface CO2 fluxes under different land uses were significantly positively correlated with air temperature and soil temperature at different depths.Soil moisture（WFPS） influenced soil CO2 concentrations and surface fluxes to some extent,but in almost all fields,there was no obvious correlation between them.The correlation analysis results showed there was a significant and positive relationship between soil CO2 concentrations and surface CO2 fluxes,suggesting surface CO2 fluxes strongly depended upon the accumulation and distribution of CO2 concentrations in the soil profile.

关 键 词：土壤CO2浓度 地表CO2通量 季节变化 温度 湿度 喀斯特地区 

分 类 号：S152.6[农业科学—土壤学]