森林凋落物-土壤动物-土壤系统中营养元素含量关系及分异
摘要
There are many reports about the characteristics of spatial distribution of chemical elements in different soils and the interactions between macrofaunas and litter or soil,especially,about the horizontal distribution.However,researches on the vertical distribution are limited.And there are few researches into the relationships among forest littermacrofaunas-soil.This paper tends to combine them into the whole and studies the nutritional elements through forest litter,macro faunas and soil.The study area is a shady slope on a low hill located in the Zuojia Natural Reserve(126°～126°2′E,44°03′～44°04′N) in Jilin province.The mean altitude is 300m.The region belongs to the temperate continental monsoon climate.The zonal soil is dark brown soil.The vegetation is mainly secondary mixed deciduous broadleaf forests with Quercus mongolica and Tilia mandshurica as the dominant species.Four sampling sites are located on the same slope surface but different habtats,such as the valley,foot hill,the middle section and the peak.Forests litter,macrofaunas and soil samples were sampled in each habitat,every 20 apart along the slope.The contents of nutritional elements N,P,K,Ca,Mg,and Fe of litter-macrofaunas-soil were measured in laboratory.The relation and difference of nutritional elements in litter-macrofaunas-soil and the vertical difference in nutritional elements of the same slope surface were studied.The result indicated that the vertical difference of six elements was not quite remarkable on the hill slope surface.The contents of N,P and Ca in macrofaunas were higher than those of litter and soil,but the contents of K,Mg and Fe in soil were more than those of macrofaunas and litter.The changes of N in litter,macrofaunas and soil are consentaneous,that is the content of N in the middle position of the slope surface was higher than in the valley and the peak.This is consistent with the surface soil organic matter.On the upper part of the slope,the contents of P and K were the