河南省表层土壤全碳与有机碳地球化学背景值研究

Study on Geochemical Background Values of Total Carbon and Organic Carbon in Surface Soil of Henan Province

基于2003—2020年河南省陆续完成的1∶25万多目标区域地球化学调查项目的成果数据,系统研究了河南省表层土壤全碳与有机碳地球化学背景值特征。结果表明,河南省表层土壤全碳和有机碳地球化学背景值在不同行政区、不同流域、不同成土母质发育的土壤中差异明显。表层土壤全碳背景值行政区空间分布总体表现为西部山前高、东部平原低,北部碱性土壤区高、南部酸性土壤区低;流域分布以海河流域—黄河流域—淮河流域—长江流域依次降低;成土母质按残积与残坡积物—河流冲积物—洪积物—风积物—黄土与红土—河湖相沉积物发育的土壤全碳背景值逐渐降低。表层土壤有机碳背景值行政区总体表现为山前偏高、平原偏低,不同流域的表层土壤有机碳背景值差异大;成土母质以残积与残坡积物—洪积物—河湖相沉积物—黄土与红土—河流冲积物—风积物发育的土壤有机碳背景值逐渐降低。

Based on the results of the 1∶250000 regional geochemical survey projects completed in Henan Province from^(2)003 to 2020,the geochemical background values of total carbon and organic carbon in surface soil in Henan Province were systematically studied.The results showed that there were significant differences in the geochemical background values of total carbon and organic carbon in the surface soil of Henan Province in different administrative regions,watersheds and soils with different parent materials.The overall spatial distribution of the total carbon background value of surface soil in administrative regions showed that it was higher in the western mountainous areas and lower in the eastern plains,higher in the northern alkaline soil areas and lower in the southern acidic soil areas;the distribution of river basins decreased in sequence from the Haihe River Basin to the Yellow River Basin,then to the Huaihe River Basin,and finally to the Yangtze River Basin;the total carbon background value of soil developed from residual and residual slope deposits,river alluvial deposits,alluvial deposits,aeolian deposits,loess and red soil,and river lake sediments gradually decreases.The background values of surface soil organic carbon in administrative regions were generally higher in mountainous areas and lower in plains,and there were significant differences in the background values of surface soil organic carbon in different watersheds;the background value of soil organic carbon developed from residual and residual slope deposits,alluvial deposits,river lake sediments,loess and red soil,river alluvial deposits,and aeolian deposits gradually decreased.