中国中温带东部生态地理区划的土壤指标选择

Soil Indicators of Eco-geographical Regionalization in Mid-temperate Zone of Eastern China

中国生态地理区域系统是我国区域系统研究定量化、系统化、动态性发展的重要成果。为深入探讨其土壤指标体系建设问题,以《中国土种志》和省级土壤资料中的剖面点数据为基础,采用主成分分析与判别分析相结合的方法,以中温带东部地区为例,探讨适合进行中温带东部地区生态地理区域系统划分的土壤指标;在此基础上对代表中温带东部地区生态地理区域特征的土壤类型进行聚类分析。结果表明:A层有机质含量、阳离子交换量、pH值、粘粒含量和土壤容重等5项指标在中温带东部的生态地理区域划分中作为土壤指标较为合适;运用回归克里格方法,得到5项土壤指标的空间分布数据库;与区划中土壤类型和单项土壤区划相比,简洁量化的土壤指标更适宜系统的表述中温带东部的生态地理区域特点。

Eco-geographical region system is an important result of China＇s regionalizational development quantitatively, systematically and dynamically. In order to probe into the topic thoroughly, based on the data from the second China＇s national soil survey and the provincial soil resource information, by principal analysis and discriminant analysis, this paper discusses the appropriate soil indicators as the complement of eco-geographical region indicator systems and the relationship between these soil indicators and soil types in regionalization. The results show that five soil indicators are used in eco-geographical regionalization in mid-temperate zone of eastern China, which are the content of organic matter, cation exchange content, pH, clay capacity and soil bulk density in topsoil. With a regression-kriging approach, the maps of soil indicators in mid-temperate zone of eastern China are compiled with a resolution of 1 km in every grid and the indicative meaning of these soil indicators is discussed. By a cluster analysis, it is proved that these soil indicators are better than the soil types and soil regionalization in delineating eco-regionalization zones.