陇东地区几种主要耕作土壤质量评价及改良利用研究

The Quality Assessment and Improvement of several major cultivating Soil in East region of Gansu Province

采用二次累计积分法对陇东地区主要耕作土壤进行质量评价,将24种耕作土壤划分为4个等级.其中,厚覆盖粘化黑垆土、厚覆盖黑垆土、条田黑垆土、五花土、淤黄土、厚腐殖质灰绵土、残余潮土、耕种灰褐墡土和黄泥土等9种土壤属于Ⅰ等土壤,薄覆盖黑垆土、砂石土、耕种灰褐土和红胶土四种土壤属于Ⅱ等土壤,这十三种土壤是陇东地区基础肥力较好,生产力水平较高,需要重点培肥和合理开发利用的土壤.其余十一种土壤分属Ⅲ、Ⅳ等,绝大多数需要退耕还林还草,进行生态修复和改良利用.

The quality of major cultivating soil in east region of Gansu province was evaluated by twice accumulative score in the experiment,in which 24 kinds of cultivating soil were divided into four grades.9 kinds of soil were classified as grade Ⅰ,including the thick cover claying black loess,thick covered black loess,tessellated loess,silting loess,thick humus gray loess,residual alluvial soil,planting gray-brown soil and yellow soil.4 kinds of soil were classified as grade Ⅱ,including thin covered black loess,sand soil,planting gray-brown soil and red gum soil.The basic fertility of this two grades,13 kinds of soil,is good in east of Gansu.They also have higher productivity,which we need to focus on fertility improvement and rational exploitation of the soil.The remaining 11 kinds of soil were classified as grade Ⅲ and Ⅳ,which the vast majority of soil need to be as forests or grassland,improving soil fertility for ecological restoration.