To understand the reasons for poplar degeneration with different degrees in Zhangbei,we investigated the poplar forest stands.Results suggest that in plot Ⅱ and plot Ⅳ,the top dry degree had significant correlation with tree height in a certain level.But when the top dry degree and the diameter at breast height had significant correlation in plot Ⅱ,there was no significant correlation in plot Ⅳ.In all the 6 plots investigated,5 had tepetate in their soil profiles.The tepetate kept root system from growing in soil,it was a main top dry factor.As the forest age was too old and underground water was decreasing sharply,the trees were really weak,which were easily attacked by insects.
CHENG Yueming
,
ZHANG Yuan
,
CUI Shuo
,
MA Changming
. Study on Poplar Degeneration in Zhangbei County,Hebei Province —A case study in Panchengying[J]. Forest and Grassland Resources Research, 2015
, 0(1)
: 152
-155
.
DOI: 10.13466/j.cnki.lyzygl.2015.01.027
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