Fertilizing Coastal Douglas-fir Forests PDF Download
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Author: Donald P. Hanley
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 20
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Book Description
Describes the benefits of well nourished trees to forest ecosystems. Results assist landowners to decide what is appropriate for their forest.
Author: Donald P. Hanley
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 20
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Book Description
Describes the benefits of well nourished trees to forest ecosystems. Results assist landowners to decide what is appropriate for their forest.
Author: Richard E. Miller
Publisher:
ISBN:
Category : Forest soils
Languages : en
Pages : 44
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Book Description
Author:
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 36
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Book Description
Five randomly assigned treatments were used to quantify effects of adding varying numbers of red alder (Alnus rubra Bong.) or nitrogen (N) fertilization on growth of a 10-year-old conifer plantation at a medium quality site in the western Washington Cascade Range. Zero, 20, 40, and 80 alder trees per acre were retained along with about 300 conifers per acre. Nearly all conifers were coast Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco). A fifth treatment substituted N fertilizer for N-fixing alder. Changes in average tree height, and in numbers of trees, basal area, and volume per acre between plantation ages of 10 and 27 are compared. In pure conifer plots, gross volume growth averaged 26 percent greater on fertilized than nonfertilized plots, indicating measurable benefits of additional N. On both fertilized and nonfertilized plots, an average of 13 percent of the original conifers died. Retaining 20, 40, or 80 alder per acre (7, 13, and 27 percent of the associated conifer trees per acre, respectively) was associated with reduced numbers of Douglas-fir by about 19, 5, and 17 percent, respectively, in the next 17 years. Mortality and growth of Douglas-fir were not related to alder density, but losses of Douglas-fir were especially large on plots where relatively large red alder (20 per acre) were retained. Neither total stand nor conifer yields were changed by retaining alder. Additional comparisons are needed at other locations, especially those with known N deficiency.
Author: M. A. Radwan
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 710
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Author:
Publisher:
ISBN:
Category : Forest soils
Languages : en
Pages : 332
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Author:
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 176
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Book Description
Silvicultural practices in the Douglas-fir region evolved through a combination of formal research, observation, and practical experience of forest managers and silviculturists, and changing economic and social factors. This process began more than a century ago and still continues. It has had a great influence on the economic well-being of the region and on the present characteristics of the regions forests. This long history is unknown to most of the public, and much of it is unfamiliar to many natural resource specialists outside (and even within) the field of silviculture. We trace the history of how we got where we are today and the contribution of silvicultural research to the evolution of forest practices. We give special attention to the large body of information developed in the first half of the past century that is becoming increasingly unfamiliar to both operational foresters andperhaps more importantlyto those engaged in forestry research. We also discuss some current trends in silviculture and silviculture-related research.
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 618
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Author: Henry Nixon Chappell
Publisher:
ISBN:
Category : Forest soils
Languages : en
Pages : 316
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Book Description
Author: Peter Bacon
Publisher: CRC Press
ISBN: 9780824789947
Category : Technology & Engineering
Languages : en
Pages : 630
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Book Description
This study examines the interactions between nitrogen and the ecosystem and discusses nitrogen fertilization practices around the world. Simulation models that play an important role in determining the dynamics of source-sink relationships are presented, helping to pinpoint inefficiencies and develop strategies to synchronize nitrogen supply and demand.
Author:
Publisher:
ISBN:
Category : Forest soils
Languages : en
Pages : 256
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Book Description
