广西海岛土壤脱硅富铝化作用的初步研究

A Preliminary Study on the Desilicification and Allitization of Soils on the Islands of Guangxi

在对涠洲岛、渔岛和西村岛的３个剖面的１１个土壤样品和３个母岩样品进行矿质全量、游离氧化铁及粘粒矿物等分析的基础上，对海岛土壤的脱硅富铝化作用进行了初步研究。结果表明，３个海岛的土壤的脱硅富铝化强度是涠洲岛＞渔岛＞西村岛，但均比相同气候带下的砖红壤、赤红壤的脱硅富铝化作用弱。据此及其他分析结果，建议将涠洲岛土壤（１号剖面）归类于铁硅铝土土纲、湿润铁硅铝土亚纲中的棕红壤土类，将渔岛。２号剖面）和西村岛（３号剖面）的土壤归类于铁硅铝土土纲、湿润铁硅铝土亚纲中的准红壤土类。

On the basis of analysing the chemical constituents, free iron oxide and clay mineral of 9 soil samples of 3 soil profiles and their parent rocks on Weizhou,Yuwan and Xicun islands; we studied preliminarily the desilicification and allitization of soils on the islands. The results showed that the intensity of desilicification and allitization of the soils was Weizhou>Yuwan>Xicun, but all of them were weaker than the desilicification and allitization of Laterite or Latentic red earth under the same climate conditions. Based on this and other analysing results, we proposed to classify the soil of Weizhou Island (No.1 profile) into the group of Brown-red soils which belongs to the suborder of Udic Fersiallisols underthe order of Fersiallisols and to classify the soils of Yuwan Island (No. 2 profile) and Xicun Island (No.3 profile) into the group of Para - red soils which belongs to the suborder of Udic Fersiallisols under the order of Fersiallisols.