雷州半岛南部若干红土剖面的地球化学与成土环境研究

雷州半岛南部第四纪火山岩台地发育的红土剖面由碱性玄武岩风化型（Ｉ型）和拉斑玄武岩风化型（ＩＩ型）组成。从首次构建的淋溶系数（Ｌ）－水化系数（Ｈ）－氧化系数（Ｏ）关系图（简称ＬＨＯ图）发现,两类剖面的ＬＨＯ曲线的演化途径完全不同。Ｉ型红土在潮湿贫氧环境下形成,富含Ｆｅ、Ａｌ、Ｔｉ、水和有机质,ＩＩ型红土在干旱富氧环境下形成,富含Ｃａ、Ｍｇ、Ｎａ、Ｋ、Ｐ和Ｓｉ。此外,对两种类型红土环境的转型机制和成土

Geochemistry and soil-forming environment of the red soil section in the southern Leizhou Peninsula, Gaungdong Province

The red soil sections developed on the Quaternary volcanic platformconsist of the alkaline basalt weathering type (I type) and tholeiite weathering type (II type). The the eluviation coefficient (L), relation diagram of the hydration coefficient (H) and oxidation coefficient (O) (LHO diagram) created first on the sections shows a completely different evolution process between the I type and II type sections. The I type red soil section was formed in a wet and oxygen deficient environment and rich in ferrite, aluminum, titanium, water and organic materials, whereas the II type section wasformed in a dry and oxygen abundant environment and rich in calcium, magnesium, sodium, potassium, phosphor and silicon. The type transformation mechanism and soil forming environmental cycles of the two types of red soils are preliminarily studied in this paper.