黄淮海平原土壤碱化分级的初步研究

碱化土壤是我国北方平原地区广泛分布的一种低产土壤,它的改良利用是提高该地区农业生产水平的重要措施之一.碱化土壤因其碱化程度不同,改良措施也不一样,因此,土壤碱化分级对生产有一定的意义.

A PRIMARY STUDY ON SUBDIVISION OF DEGREE OF SOIL ALKALINIZATION IN HUANG-HUAI-HAI PLAIN

The present paper deals with the subdivision of degree of soil alkalinization in Huang-Huai-Hai plain, the conclusions are summarized as follows:1. If the soil samples collected are typical and representative, the analytical data are reliable and variables selected (property indexes)are suitable, the application of "the analytical method of synthetic numerical value" in subdivision of degree of soil alkalinization may be realized satisfactorily. 2. Based on the major items and specific indexes suggested by the authors, the alkalized soils in Huang-Huai-Hai plain are subdivided into 4 grades, namely, tile alkali soil, strongly alkalized soils, moderately alkalized soils and weakly alkalized soils. The standards for subdivision of the alkalized soils are given in tables 2. According to the equation.