红壤性水稻土稀土元素组分分布与变异性研究

测定了具有代表性的 4种母质发育、3种水育型的红壤性水稻土及起源土壤的∑REE、∑LREE和∑HREE ,分析了其分布特点和剖面变异性 ,表明 :(1)红壤性水稻土的∑REE平均水平和离散性均大于全国水稻土平均水平 :(2 )不同母质发育的供试土壤的∑REE和∑LREE的平均水平依玄武岩母质土壤系列 >石英闪长岩母质土壤系列 >黑云母花岗岩母质土壤系列 >凝灰岩母质土壤系列顺序递减 ;(3 )土壤剖面稀土组分体系的变异程度为 :∑LREE >∑HREE >∑REE ;而在不同水育类型上则依起源土壤、潜育型水稻土、渗育型水稻土、潴育型水稻土顺序增大。 (4 )∑LREE和∑HREE在渗育型水稻土的E层和潴育型水稻土的Br层具有显著的分馏作用

Rare Earth Element Distribution and Variability in Paddy Soils Derived from Red Earth

∑REE、∑LREE and∑HREE in three different hydromorphic paddy soils and their original soils derived from four parent materials are determined and their distribution and variability in soil profiles are analyzed.The results are as follows:(1) The average values and discreteness of∑REE in paddy soils derived from red earth are higher than the countrywide paddy soils:(2)The average values of ∑REE and∑LREE in the tested soils decrease in the order of basalt parented soils, quartz iorite parented soils, biotite granite parented soils and tuff parented soils.(3)REE component system variability in tested soil profiles decrease in the order of ∑LREE,∑HREE,∑REE.For soils they are:periodically water-logged paddy soils, percogenic daddy soils, gleyed paddy soils and original soils.(4)There are distinct fractional distillation of ∑LREE and ∑HREE in the E horizon of percogenic paddy soils and the Br horizon of periodically water-logged paddy soils.