摘要
调查发现，延安地区啮齿动物对林区的危害度，北部比南部大，用材林比经济林大，幼龄林比中龄林大；用材林啃伤率为３．９８％～８．９２％，死亡率为４．１０％～８．６２％；经济林啃伤率为２．７４％～４．３８％，死亡率为０．４５％～１．１１％；幼龄林啃伤率在５．０５％～１４．６２％，死亡率为１５．５８％～２６．７０％；中成龄林啃伤率为２．０２％～４．２５％，死亡率为０～０．６４％。
A investigation on harm of gnawing animals to the forest shows as follows.The degree of harm to the northern forest is more serious than to the southern forest, to timber forest than to economic forest, to young age forest than to middle age forest. The rate of gnawing harm of timber forest is between 3.98%～8.92%,death rate 4.10%～8.62%,those of economic forest are 2.74%～4.38%and 0.45%～1.11% respectively,the gnawing rate of young age 5.05%～14.62%,death rate 15.58%～26.70%,those of middle age forest are 2.02%～4.25% and 0～0.64% respectively.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
1998年第6期527-530,共4页
Journal of Northwest University（Natural Science Edition）
关键词
森林区
啮齿动物
啃伤率
死亡率
危害
region of forest
gnawing animal
species of superiority
rate of gnawing harm
death rate
region of Yan′an
