Contents and availability of trace elements in soils of natural forests in karst region
YANG Lin
YANG Cheng
ZHU Tongbin
XIE Yincai
QIN Xinghua
LUO Liuling
ZHU Zihong
MENG Lei
HE Qiuxiang
Abstract：Soil under undisturbed natural forests were sampled to investigate total and available contents of four trace elements (Cu,Fe,Mn and Zn) from four nature reserves including Maolan in Guizhou,Mengyuan and Green Stone Forest in Yunnan,and Exianling in Hainan,all of which were characterized by typical karst landform.The results showed total content of Cu,Fe,Mn and Zn reached to 0.03～0.08g · kg-1,35.6～ 57.4 g · kg-1,0.74～5.83 g · kg-1 and 0.13～1.03g · kg-1,respectively,which were significantly higher the average national background values.The available content of Cu,Fe,Mn and Zn in study areas were 1.09～3.51 mg · kg-1,11.6～62.9 mg · kg-1,48.3～173 mg · kg-1 and 4.17～37.6 mg · kg-1,respectively.According to the evaluation standard for trace elements in soil,available contents of all four elements were at relatively high level.The average activation ratios of Cu,Fe,Mn and Zn in soils under the natural forest were 5.48％,0.10％,6.44％ and 4.19％,respectively,indicating high supply level for Cu,Mn and Zn but low supply level for Fe.Total availability index of trace element (Et) in soil was ranked as Maolan (21.0) ＞Green Stone Forest (12.8) ≈Mengyuan (12.7) ＞Exianling (5.15).In addition,Et was significantly positively correlated with total N and organic carbon contents.
Keywords：karst areanatural foresttrace elementsavailability
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 59-66 )