搜索结果: 16-19 共查到“知识库 林学 Douglas-fir”相关记录19条 . 查询时间(0.225 秒)
Diversification of increment reactions of Douglas fir (Pseudotsuga menziesii Franco) from mountainous regions of southern Poland
Douglas fir dendroclimatology tree ring
<
2015/1/28
Dendroclimatological research presented in this paper concerns Douglas fir (P. menziesii) at 17 sites located in the area of the Sudetes Mountains, the Polish part of the Carpathians and Roztocze. The...
An integrated management system for the Douglas-fir tussock moth in southern British Columbia
biological control defoliation Douglas-fir tussock moth forest pest management interior Douglas-fir nuclear polyhedrosis virus
<
2010/8/31
An integrated, long-term system to detect and treat infestations of Douglas-fir tussock moth in the Southern Interior of British Columbia was successfully implemented between 1984 and 1999. All aspect...
An old-growth index for Douglas-fir stands in portions of the Interior Douglas-fir zone, central British Columbia
British Columbia Douglas-fir forests forest management Interior Douglas-fir zone old growth
<
2009/2/11
We describe a quantitative old-growth index for Douglas-fir (Pseudotsuga menziesii var. glauca) stands in two Interior Douglas-fir (IDF) biogeoclimatic variants (dk3 and dk4) in the central interior o...
The Effects of Origin and Regional Differences on the Density of Douglas Fir [Pseudotsuga menziesii（Mirb.）Franco] Wood
Origin and Regional Differences Density of Douglas Fir [Pseudotsuga menziesii (Mirb.) Franco] Wood
<
2009/1/16
In this study, the effects of origin and regional differences on the density of Douglas Fir [Pseudotsuga menziesii (Mirb.) Franco] wood were investigated. A total of 18 trees of 23 different ages obta...