云城盆地土壤的研究

A STUDY ON THE SOILS OF THE YUNCHENG BASIN

云城为宽谷岩溶盆地，底部为峰林所点缀，酸性红色石灰土分布于丘陵地带，宽谷是以冲积物为母质发育而成的水稻土区。为提高土地生产力，应采取有效措施进行土壤改良。

The Yuncheng Basin is situated at the middle reaches of the Xijian River basin in West Guangdong. The bottom of the basin is spotted with Karst peaks, the hilly land is distributed by acid red limestone soil, and the wide valleys belong to rice soil area. The basin can be divided into three zones of soils: The middle zone with paddy soils in the broad valleys and acid red limestone soil on the hills; North and west zone where red earth and yellow earth are distributed on high hills and low mountains; East and south zone with crimson soil on low hills and rice soils in broad valleys and small plains. The author considers that the basic measures to improve soils in the areas are as follows: 1) make well affrestation, and water and soil conservation; 2) strengthen capital construction of farmland, and enhance the ability of controlling flood and withstanding natural calamities; 3) popularize the system of three crops a year and raise soil fertility, expanding the area of high and stable yield farmland.