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Book Fifth year Growth Responses of Douglas fir to Crowding and Other Competition

Download or read book Fifth year Growth Responses of Douglas fir to Crowding and Other Competition written by Elizabeth C. Cole and published by . This book was released on 1984 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis examines the competitive aspects of Douglas-fir trees growing with two commonly associated competitors--red alder and grass--at varying densities. Two Nelder plots in three different environments in the Oregon Coast Range were studied. The sites represented the warm, dry climate of the Willamette Valley; the warm, moist climate of the valleys of the mid-range; and the cool, moist climate found along the fog belt a few miles from the Pacific Ocean. Plots ranged in spacing from 300 to 15250 cm2/tree and consisted of six "pie-shaped" treatments. The plots had been previously planted in the spring of 1978 with 2-0 bare root Douglas-fir nursery stock. Two sections were interplanted with red alder, and two sections were broadcast seeded with grass the following year. Measurements indicate that Douglas-fir growth is inhibited by red alder and grass competition as well as competition from other Douglas-fir. Grass competition is severe only during the initial years of the plantation, while red alder competition becomes more pronounced with time. Growth is a function of density, competitor type, and site, and significant interactions occur among the three. Leaf area per tree of Douglas-fir under competition can be predicted by leaf weight, stand density, and competitor type. The formation of shade needles in response to density and competitor type increases the leaf area:leaf weight ratio. Growth efficiency (stemwood volume production/unit of leaf area) is not highest for the most vigorous trees. On a per hectare basis, high productivity is correlated with high leaf area index, but the relation is reversed on a per tree basis.

Book Masters Theses in the Pure and Applied Sciences

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 29 (thesis year 1984) a total of 12,637 theses titles from 23 Canadian and 202 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 29 reports theses submitted in 1984, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

Book Research Paper PNW

Download or read book Research Paper PNW written by and published by . This book was released on 1978 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Ten year Development of Douglas fir and Associated Vegetation After Different Site Preparation on Coast Range Clearcuts

Download or read book Ten year Development of Douglas fir and Associated Vegetation After Different Site Preparation on Coast Range Clearcuts written by William I. Stein and published by . This book was released on 1995 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Competition Climate and Drought Effects on Tree Growth in an Encroached Oak Woodland in Northern California

Download or read book Competition Climate and Drought Effects on Tree Growth in an Encroached Oak Woodland in Northern California written by Jill J. Beckmann and published by . This book was released on 2019 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oregon white oak (Quercus garryana Douglas ex Hook.) is experiencing increasing competition from Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) across its range at the same time as climate models are predicting increasing climate variability, including drought. Management recommendations that consider competition dynamics between these species under a changing climate are therefore needed for oak woodlands, but we do not currently understand the combined effects of competition, climate, and drought in this ecosystem. This research examines radial tree growth and drought response in Oregon white oak and Douglas fir in an encroached oak woodland near Kneeland, California. Stem maps of local crowding competition were created for 104 Oregon white oak and 104 Douglas-fir trees that were sampled for growth across Douglas-fir encroachment levels. Linear mixed effects models were used to evaluate the effects of DBH, Douglas fir crowding, oak crowding, and climate on tree growth (2002-2016) and drought response (2013-2015). Oregon white oak growth had positive relationships with November-January precipitation, July-August precipitation, April-June mean maximum temperature, and September maximum temperature; and negative relationships with oak crowding, Douglas fir crowding, and summer maximum temperature. Douglas-fir growth had a positive relationship with May-June precipitation and negative relationships with Douglas fir crowding and June-July mean maximum temperature. Oregon white oak growth was more resistant to prolonged drought than Douglas fir. However, oak resistance to drought was also negatively related to Douglas fir crowding and positively related to oak crowding. Oregon white oak may be better suited to a future climate than Douglas fir, but Douglas-fir encroachment will continue to degrade this ecosystem and threaten the ability of Oregon white oak to resist future drought. Prevention and management of Douglas fir encroachment in oak woodlands is therefore encouraged to preserve ecosystem function under climate change.

Book Research Contribution

Download or read book Research Contribution written by and published by . This book was released on 1993 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book FRDA Report

Download or read book FRDA Report written by and published by . This book was released on 1990 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Alabama s Forest Products Industry

Download or read book Alabama s Forest Products Industry written by and published by . This book was released on 1986 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book General Technical Report PNW GTR

Download or read book General Technical Report PNW GTR written by and published by . This book was released on 1992 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Canadian Journal of Forest Research

Download or read book Canadian Journal of Forest Research written by and published by . This book was released on 2006 with total page 1264 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Forest Pest Management in Southwest Oregon

Download or read book Forest Pest Management in Southwest Oregon written by Ole Terrence Helgerson and published by . This book was released on 1986 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Regenerating Coastal Forests in Oregon

Download or read book Regenerating Coastal Forests in Oregon written by and published by . This book was released on 1996 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: This annotated bibliography was compiled to provide a comprehensive list of sources on the ecological factors that affect forest regeneration. Abstracts from 494 publications are indexed by author, species, and subject, and are arranged into 4 major sections. Topics include the effects of biotic factors, abiotic factors, and stand and site history on vegetation, effects of vegetation on aerial and soil resources, effects of vegetation on stand development, vegetation management, plant succession, and response of vegetation to silvicultural activities and disturbances. The citations are predominately for coastal Douglas-fir occurring west of the Cascade Range in Oregon and Washington; however, applicable citations for associated conifers, hardwoods, shrubs, and herbs and for Alaska, California, and British Columbia are also included. Citations on forest genetics, seeds, seedling physiology, and insects are not included in the bibliography.