Relation of Initial Spacing and Relative Stand Density Indices to Stand Characteristics in a Douglas-fir Plantation Spacing Trial PDF Download
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Author: Robert O. Curtis
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 40
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Book Description
Author: Robert O. Curtis
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 40
Get Book Here
Book Description
Author: Robert O. Curtis
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 27
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Book Description
Author: Robert O. Curtis
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Donald L. Reukema
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 30
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Book Description
Author: Toshiaki Owari
Publisher: CRC Press
ISBN: 1000598187
Category : Nature
Languages : en
Pages : 131
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Book Description
This book disseminates various long-term data and research results from university forests in Asia towards realizing adaptive forest management and conservation based on a comprehensive understanding of environmental changes and ecological responses. University forests - which refer to large, forested areas owned or controlled by universities and devoted primarily to research and teaching programs in forest-related sciences - have collected, managed and analyzed long-term meteorological, hydrological, biological and geographic data under an organizationally stable observation system. With the influence of global warming becoming apparent and extreme weather events occurring more frequently in the region, it is an important and urgent challenge to understand long-term environmental and ecosystem changes in forests and provide robust scientific knowledge on how ecosystems respond to those changes. This book is a step towards addressing the challenge. The chapters in this book were originally published as a special issue of the Journal of Forest Research.
Author: F. Evert
Publisher: ottawa : forest management institute
ISBN:
Category : Forest thinning
Languages : en
Pages : 162
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Book Description
Author: J. Michael Geist
Publisher:
ISBN:
Category :
Languages : en
Pages : 704
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Book Description
Author: George R. Staebler
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 61
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Book Description
Author: Peter Lawrence Marshall
Publisher: Canadian Forest Service
ISBN:
Category : Douglas fir
Languages : en
Pages : 40
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Book Description
The objectives of this report were to describe the treatments applied in a Douglas-fir spacing study carried out on the Alex Fraser Research Forest of the University of British Columbia; and, to access the initial effect of these treatments on the residual stand structures.
Author: United States Department of Agriculture
Publisher: CreateSpace
ISBN: 9781508795865
Category :
Languages : en
Pages : 48
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Book Description
The 1925 Wind River spacing test is the earliest field trial seeking to determine the most appropriate spacing for planting Douglas-fir. Spacing treatments were not replicated, although individual spacings were subsampled by two to four tree-measurement plots. Previously, greater growth occurred at the wider spacings (10 and 12 ft) than at the closer spacings (4, 5, 6, and 8 ft). We considered three possible explanations: (1) close spacing eventually retarded growth, (2) soil quality may be better in the 10- and 12-ft spacings than at closer spacings, and (3) tree spacing and soil quality combined affected growth. To test these explanations, we (1) measured and mapped several site factors (topographic relief, depth to bedrock, and soil properties) and (2) related these factors to tree and stand growth. We infer from the strong correlation between spacing and soil variables that the influence of soil and spacing cannot be separated; differences in soil depth and available water capacity confound spacing effects and vice versa. Because soils in the wider spacings are generally deeper and have more available water capacity than do soils in the closer spacings, we conclude that some of the superior tree growth attained in the 10- and 12-ft spacings is due to more favorable soil conditions. Visual comparisons of tree size, however, suggest that spacing is probably the stronger factor affecting tree growth at this location.
