寒温带多年冻土元素背景值及分布特征研究

STUDY ON PERMAFROST ELEMENTS BACKGROUND VALUE AND DISTRIBUTION CHARACTERISTIC IN THE COOL TEMPERATE ZONE

寒温带多年冻土是我国唯一的高纬度多年冻土。本文以大兴安岭多年冻土为研究对象,对冻土中17种森林必需的化学元素背景值进行分析得出:研究区冻土中Al2O3、Fe2O3、N等元素较富集,P、B和S元素较贫乏;在坡上,阳坡MgO、Na2O等元素较富集,而阴坡除这些元素外还有Cu和Mn较富集;在坡中,阳坡CaO、Mo、Cu含量较高,阴坡Fe2O3较高,元素在不同坡向的分布具有显著性差异;在坡下,阳坡P、B和Co含量较高,而阴坡中Na2O、Mo、S、P、B、Cu和Mn较富集。通过对冻土元素背景值的研究分析,为进一步研究大兴安岭地区多年冻土区森林必需元素丰缺状况及该地林业、环境等方面的研究提供基础性资料。

The cool temperate permafrost is the only high-altitude permafrost in China.This paper takes the permafrost as the research object in Greater Higgnan Mountains,meanwhile 17 kinds of essential elements＇ background values are analysed.Research findings show that some elements are enriched,such as Al2O3,Fe2O3 and so on,but the contents of P,B and S are poor.In slopes,MgO and Na2O are enriched in sunny slope,and except these elements,Cu and Mn have high contents;in the middle slope,CaO,Mo,Cu are enriched in sunny slope,and Fe2O3 has a high content in shady slope,these elements have significant difference in different slopes,in the bottom of slope,P,B and Co are enriched in the sunny slope,Na2O,Mo,S,P,B,Cu and Mn have high contents.Based on this research and analysis of permafrost background value,this paper provides basic information for further research of forest essential elements＇ abundant condition,forestry and environment in Greater Higgnan Mountains.