References in periodicals archive ?
A 1987 study estimated that 30% of the white oak woodlands in one region of Redwood National Park had been lost to encroachment by Douglas fir since 1850, but there has been limited research since on the encroachment issue.
Thus has white pine fallen from first place among the timber trees of the continent; thus has Douglas fir (which no American had ever seen or heard of when the keel of the Constitution was being laid) risen to position of premier industrial tree of the world.
Oak is an extremely shade intolerant species and because Douglas fir is a faster-growing tree, the firs eventually shade the oak trees and kill them.
The Douglas fir was named after Perthshire environmentalist David Douglas, who was born 200 years ago.
Strong branches and plentiful foliage of the Douglas Fir provide a beautiful backdrop for your ornaments.
Douglas fir has a light-colored sapwood and a reddish-brown heartwood.
Kintigh, who has been raising them since 1955, says that the Douglas fir remains most popular among his customers, but that the noble is gaining on it.
The giant Douglas Fir tree trunks make painfully slow progress from Bergwm forest to Builth Wells for the Royal Welsh Show's pole climbing competition
Influence of knot area ratio on the bending strength of Canadian Douglas fir timber used in Japanese post and beam housing.
A magnificent Douglas Fir tree at Lake Vyrnwy, a nature reserve managed by RSPB Cymru, has been officially confirmed as the tallest tree in Wales - and the joint tallest in Britain.
Enclosing the buildings with sinuous walls of reinforced concrete, hollow steel sections form ridges, eaves and columns, spanning between ridges and eaves with laminated wooden beams of Douglas fir.
Sweetgum trees are one of the few hardwood species that southern paper companies want to add to their tree plantations, which now consist primarily of pine and Douglas fir, Merkle says.