土地利用空间差异对典型喀斯特泉域化学风化碳汇的影响  

Impact of Land-use Spatial Variability on the Atmospheric Carbon Sequestration of the Rock Weathering Process in Typical Karst Spring Catchments

作　　者：孙婷[1] 邓飞艳[1,2] 焦树林[1] 

机构地区：[1]贵州师范大学地理与环境科学学院 [2]贵州省山地遥感应用重点实验室,贵阳550001

出　　处：《热带地理》2017年第1期19-24,共6页Tropical Geography

基　　金：国家自然科学基金项目(41263011);贵州省高层次人才特助基金[TZJF(2009)25];贵州省科学技术基金(黔科合计省合[2012]7005号)

摘　　要：为了研究土地利用等人类活动对岩溶作用碳汇的影响规律,采用野外调查和遥感影像相结合的方法,获取2个毗邻的典型喀斯特特小流域土地利用数据特征。利用现场实测水体理化参数,采用径流系数法分别计算其碳汇通量和碳汇强度。对比分析两流域的土地利用类型和岩溶碳汇强度的差异,结果显示:1)陈旗和灯盏河2个喀斯特流域的化学风化碳汇具有显著的季节变化特征,其碳汇强度分别为1.24×106和1.44×106 mol/(km2·a)。2)流域内土地利用类型及其上、下游配置关系,尤其是水田的上、下游配置差异,是导致岩溶作用碳汇强度差异的重要原因。人类活动是调控岩溶作用碳汇的有效途径之一。In order to study the atmospheric carbon sink effects of human activities such as land use of Karst catchments, the land use data of the two adjacent typical Karst basins were carried out by using a combination method of field surveys and remote sensing image analyses. The flux of atmospheric carbon sequestration and its intensity were calculated by the runoff coefficient method with the in situ data on physico-chemical parameters of the spring water of Chenqi and Dengzhanhe in Puding County, Guizhou. According to the comparative analysis of watershed land use types and Karst carbon sequestered intensity differences, we have gotten the following ideas： 1） The two spring watersheds had striking spatial variability of the land-use types with relatively consistent land use scale ratio, in which the land of the forest and bushwood were found in upper mountains, bared rock and grass on hill slope, dry land and paddy fields in highland or at foot of the hills, the paddy fields were distributed in highland of the upper discharging area of the Dengzhanhe spring watershed and at the hill foot of the lower discharging area of the Chenqi spring watershed, respectively. 2） the carbon sequestered intensity of the Chenqi and Dengzhanhe spring catchments were 1.24×106 mol/（km2·a）and 1.44×106 mol/（km2·a）respectively with significant seasonal variation,the rate of the atmospheric carbon sequestration in the larger area（Dengzhanhe spring catchment） was lower than that in the smaller area（Chenqi spring catchment）; 3） Watershed land use types and their configuration relation, especially the paddy field configuration differences between the upper and lower reaches, resulted in the differences of carbon sequestration flux between the two adjacent small Karst spring watersheds（Chenqi Karst spring and Dengzhanhe Karst spring）. The weathering process and its Karst dissolving intensity had important impact on the atmospheric carbon sequestration during the Karst processes. Human activity would be one of the

关 键 词：土地利用 岩石风化 碳汇 喀斯特流域 

分 类 号：X131[环境科学与工程—环境科学]