摘要：
Studying the distribution regulation of the mother rock's chemical composition and element contents as the altitude changes is helpful to the deeply develop the nutrient potential.This paper takes the mother rock of the Chinese prickly ash at the different altitude areas in the Karst dry and hot valley as study object.And it uses the study approach of environmental mineralogy.At the same time,it analyzes the basic chemical characteristics,chemical composition and element contents of the different mother rocks.The result shows that:1) The total carbon content of mother rock is 9.81-12.36 g/kg,total potassium content is 2.27 ～ 3.63 g/kg,rapidly available potassium content is 16.11 ～ 99.66 mg/kg.The content reduces as the altitude increases.Total nitrogen,available nitrogen,total phosphorus and available phosphorus are not found;2) The mass percent of SiO2,Al2O3,Fe2O3,CaO,MgO and Na2O are 0.71％ ～ 6.26％,0.36％ ～ 2.15％,0.14％ ～ 0.90,39.01％ ～ 53.86％,1.41％ ～ 12.01％,0.022％～0.031％ respectively.Their mass percent is reducing as the altitudes increases except MgO and Na2O;3) Cl content increases as the altitude increases.The variation regulation of Pb,Sr,As,Se,Mo content is not obvious.Mn,Cu,Zn,Cr,Cd,Ti,Ni,Co,TS,B content reduce as the altitude increases.Chemical composition of the mother rocks in this area presents the characteristics of low altitudes enrichment.%研究母岩化学组成和元素含量随海拔的分异规律,能够深入挖掘养分潜力.以喀斯特干热河谷不同海拔花椒林的母岩为研究对象,采用环境矿物学的研究方法,分析不同母岩的基本化学性质、化学组成与元素含量.结果表明:1)研究区母岩全碳为9.81 ～ 12.36 g/kg,全钾为2.27 ～ 3.63 g/kg,速效钾为16.11～99.66 mg/kg,总体随着海拔的升高而降低;全氮、有效氮、全磷、有效磷均未检出;2)SiO2、Al2O3、Fe2O3、CaO、MgO、Na2O的质量百分数分别为0.71％～6.26％、0.36％～2.15％、0.14％～0.90％、39.01％～53.86％、1.41％～ 12.01％、0.022％～0.031％,除MgO、Na2O外,均随着海拔的升高而降低;3)Cl含量随海拔升高而增加,Pb、Sr、As、Se、Mo含量随海拔的变异规律不明显,Mn、Cu、Zn、Cr、Cd、Ti、Ni、Co、TS、B含量总体随海拔升高而降低.该区母岩的化学成分呈现低海拔富集的特征.
