广西山地漂白黄壤的理化性质及合理利用

广西山地漂白黄壤分布在中、低山地的上部，即海拔１２００ｍ以上的山体坡面和山顶部位，成为广西土壤垂直带谱最上层结构的主要土壤类型．在温暖多雨、多云雾的亚热带季风气候条件下，以常绿阔叶林为主的自然森林植被生长茂密，土壤矿物分解较为彻底，成土过程主要是旺盛的生物富集过程、明显的脱硅富铅化与水化过程以及强烈的淋浴侧渗漂洗过程。土壤剖面层次发育明显，具Ａ１－Ａ２－Ｅ－Ｂ－Ｃ或ＡＨ－Ａ－Ｅ－Ｂ－Ｃ构型。土壤质地多为重壤土至中粘土，呈强酸性反应。表土阳离子代换量中等，有机质含量丰富，肥力高，适于发展林业，特别是发展水源林和水土保持林，它是广西最重要的水源林区。

Physical and Chemical Properties and Rational Utilization of Mouotain Bleached Yellow Soil in Guangxi

Mountain Bleached yellow soil in Guangxi is distributed at the upper part of middle and low mountains, above the elevution of 1200m. It makes up the main type of soil in the uppermost structure of vertical soil belt of Guangxi. Under the condition of subtropical monsoon climate, natural forest vegetation, in which broad-leaved evergreen trees predominate, grows densely. Soil mineral decomposition is fairly thorough. The main soil-forming processes are the vigorous biological cnrichment, evident desilicification-allitization, hydration, and strong eluvial and side-permeative bleaching Podzolisation. It has full developed soil profile with the structure A1 - A2- E- B- C or AH- A- E- B- C. Most of soil texture ranges from clay loam tO loam clay. The soil is strong acid, and as for its surface layer, there is medium cation exchange capacity, plentiful organic matter and high fertility. It is suitable for developing forestry, especially for developing forest for conservation of water and soil, and is the most important regions of forest for conservation or water supply in Guangxi.