IntensIve sIlvIculture - Forest Science Labs - Research Network ...

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592. Strand, R.F. and D.S. DeBell. 1981. Growth response to fertilization in relation to stocking levels
of Douglas-fir. In Proceedings: Forest Fertilization Conference, University of Washington,
Seattle, Washington, USA. Eds. S.P. Gessel, R.M. Kenady and W.A. Atkinson. pp. 102-106.
Keywords: planting operations
fertilization
thinning
growth
Abstract: Growing stock levels affect the response of Douglas-fir stands to applications of
nitrogen fertilizer. Response is maximum at intermediate stocking levels, and is less at higher or
lower levels of stand density. Nitrogen fertilization accelerates growth and therefore increases the
rate of buildup of stand density. Thinnings will be required to reduce stocking to appropriate
levels if good responses to repeated nitrogen applications throughout a rotation are to be obtained.
593. Sturrock, R.N., E.J. Phillips and R.G. Fraser. 1994. A trial of push-falling to reduce Phellinus
weirii infection of coastal Douglas-fir. B.C. Ministry of Forests FRDA-Report 217. vi + 22 p.
Keywords: tree/stand protection
economics
tree/stand health
soil properties
Abstract: In push-falling, whole trees are pushed over by a bucket- and thumb-equipped
excavator then grapple skidded to a landing where root masses are cut off and stems are bucked
into logs. Harvesting of trees and removal of diseased roots is thus achieved with one stand entry.
The productivity and economics of push felling were evaluated in a second-growth Douglas fir
(Pseudotsuga menziesii) stand in coastal British Columbia. Results indicated that costs are
comparable to those for conventional harvesting alone and that push felling can effectively
remove infected roots. Before harvest