不同利用方式下红壤结构的形成

本文应用顺序脱胶法,对砖红壤、赤红壤和红壤在不同利用方式下的水稳性团聚体的有机和无机胶结物组成进行了分析研究。水稳性团聚体共分>5,3-1,1-0.5和<0.25毫米四级。结果表明,红壤开垦后随着粘粒活度的增加和无机胶结物含量的降低,土壤团聚体的水稳性和土壤结构系数逐渐降低。但是,一旦采用合理的施肥和管理方法,这些物理参数又会逐步恢复和增加。此外,还研究了土壤结构稳定性与土壤地带性的关系。作者认为在中亚热带的红壤上施用有机物料以增强它的结构稳定性比热带砖红壤上施用更为重要。

FORMATION OF STRUCTURE IN RED SOILS UNDER DIFFE RENT FORMS OF UTILIZATION

Study on the distribution of organic and inorganic cementing materials in different sizes of water stable aggregates in diameter of >5, 3-1, 1-0.5 and <0.25 mm separated from latosols, latosolic red earths and red earths by using a method of orderly sucessive removing the colloid from aggregates was carried out. Results show that with the increase in activity of clay particles and with the decrease in content of inorganic cementing material after exploitation of red soils the water stability of aggregates and the soil structural coefficient are decreased. These parameters, however, can be gradually increased in the application of organic material under the rational fertilization and management of soil. The relation of structural stability of red soils to soil tonality was also discussed. The strengthening structural stability of red earths in middle subtropics by application of organic material is more important than in tropical latosola.