黑垆土非代换性钾剖面分布特征的研究

The feature of profile distribution on nonexchangeable potassium of Heilu soil

本文初步研究了黄土高原黑垆土主要亚类非代换性钾的变化、分布,表明其符合指数回归方程,是草原地带黑垆土主要特征之一。粘黑垆土剖面非代换性钾分布呈“S”型,是森林地带(?)土向草原地带黑垆土、黑麻土和黑焦土过渡的森林草原地带的土壤,从形态上兼有(?)土剖面非代换性钾分布某些特征,但量上有所差异。草原地带的墹地、沟掌地和川台地的黑垆土剖面非代换性钾分布具有森林草原地带黑垆土的特征。本研究从土壤非代换性钾剖面的变化为黑垆土分类和岩石地层的划分提供科学依据。

The type and devepment of Heilu soil are related to nonexchangeable potassiumm in Heilu soil of loess region.The present paper deals with prelimiary study on the genetic charactereristics and nonexchangeable potassium of profile in major soil types of Heilu soil.The results obtai ned are summarized as follows: The distribution of nonexchangeable potassium on soil profile in light- textured soil,ortho Heilu soil and resty Heilu soil accord with exponen- tal equation. It is one principale feature in Heilu soil of steppe region. The distributicn of nonexchangeable potassium on profile of argillic Hei- lu soil is“S”formed.it is the transitional form of forest-steppe region soil from the lou soil of forest rgion to light textured soil or the Heilu soil and rusty Heilu soil of steppe region.The form of them has some features of the distribution as nonexchagable potassium in the lou soil profile,but the contents are different.The distribution of nonexchangeab- le potassium on the profile are same of on the Heilu soil of the forest-step- pe region in the gully land,gully plain land and river platform of the steppe region.