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群分析是新近发展起来的一门多元统计分类法,已引起许多学者重视。我们在东北平原中部地区的土壤环境背景值研究中,取得了大量分析数据,借助电子计算机,利用群分析的数学方法对土壤元素进行分类,试图揭示其中的某些规律。 本区地处温带半湿润地区向半干旱地区的过渡地带。东部山前低丘为森林暗棕壤和白浆土,平原内部为草甸-草原黑土和黑钙土,西部边缘为干草原暗栗钙土。沿江、河低地为草甸土和沼泽土,平原西部有较大面积的风砂土和盐碱土。自东向西土壤质地变粗,pH值增高,盐分增加。
Group analysis is a newly developed multivariate statistical classification, which has attracted many scholars’ attention. In the study of the background value of the soil environment in the central part of the Northeast Plain, we have obtained a large amount of analytical data, and classified the soil elements by means of computer and using mathematical methods of group analysis in order to reveal some of the laws. The area is located in the temperate semi-humid areas to semi-arid areas of the transition zone. The eastern foreland hilly forest dark brown soil and white soil, the interior of the meadow for the meadow - steppe black soil and chernozem, the western edge of the steppe dark chestnut soil. Along the river, the lower reaches of the river are meadow soil and bog soil, while the western part of the plain has a large area of sandy soil and saline-alkali soil. Soil texture from the east to the west becomes coarse, the pH value increases and the salt content increases.