1 edition of Factors affecting establishment of Douglas fir seedlings found in the catalog.
Factors affecting establishment of Douglas fir seedlings
Leo A. Isaac
|Statement||by Leo A. Isaac|
|Series||Circular / United States Department of Agriculture -- no. 486, Circular (United States. Dept. of Agriculture) -- no. 486.|
|The Physical Object|
|Pagination||46 p. :|
|Number of Pages||46|
er. The main reason for growing Douglas-fir is its high productivity and desirable wood properties. The value chain of Douglas-fir provides thousands of jobs and tens of mil-lions of euros worth of income and employment. Today, other factors have to be con-sidered as well. These may be positive, such as Douglas-fir’s capacity to adapt and miti-. Beginning in the mids, Douglas-fir trees established in areas in which trees did not persist historically. In , less than half the plots (42%) had trees whereas today, most plots do (94%). This encroachment was synchronous with the cessation of frequent surface fires, likely caused by the advent of domestic livestock grazing, and.
An old-canopy, Douglas-fir tree that dies as part of natural tree mortality is likely to be replaced by hemlock or cedar seedlings expanding into the canopy opening (Spies et al. ~. Similarly, winter storms that blow downisolated trees or groups of trees usually do not open sufficient areas to permit Douglas-fir regeneration. Pseudotsuga menziesii (Mirb.) Franco. Douglas-Fir. Pinaceae -- Pine family. Richard K. Hermann and Denis P. Lavender. Douglas-fir (Pseudotsuga menziesii), also called red-fir, Oregon-pine, Douglas-spruce, and piño Oregon (Spanish), is one of the world's most important and valuable timber trees. It has been a major component of the forests of western North America since the mid-Pleistocene (30).
Variable retention harvesting evolved in the Douglas-fir region of the Pacific Northwest gradually in response to increasing dissatisfaction with the ecological consequences of clear-cutting, from the standpoint of wildlife habitat and other important forest functions. It is a harvesting technique that can provide for retention (continuity) of such structures as large and old live trees, snags. Douglas-fir trees are the most common victims, he said, but stress due to weather is affecting many tree species and a variety of problems are showing up. On some Douglas .
Jesus Death in Early Christian Memory
Anxiety in elementary school children
skills of the beginning case worker as evaluated by the school, the agency, and the worker.
Report of the Secretary of State for Health
Facts about soft cheese
The Death of Hu Yaobang (Translation from Chinese, No 1)
SPSS Survival Manual
The mountains of Kranjska Gora
Memoirs of a nun
For King and Country
The O. W. Rich Nursery
Teaching Music at the Secondary Level
The order of wolves
Report to the Governor
Additional Physical Format: Online version: Isaac, Leo A. (Leo Anthony), Factors affecting establishment of Douglas fir seedlings.
Washington, D.C.: U.S. The identified influential factors and specific differences in seedling growth and mortality during the establishment phase provide critical information and guidance to the increasingly important reforestation practice of planting, and the overall analytical framework presented in this analysis is generally applicable to species beyond Douglas Author: Cen Chen, Andrew S.
Nelson. Douglas fir, genus of about six species of evergreen trees of the conifer family Pinaceae, native to western North America and eastern Asia.
They are important timber trees and produce strong wood. Several are grown as ornamentals and are common Christmas trees in North America. Variation in abiotic factors, namely watering level and pH, tempered by the effects of ectomycorrhizal richness, contributed most to variation in seedling growth.
A Survey of Factors Affecting Regeneration of Rocky Mountain Douglas-fir Russell A. Ryker Intermountain Forest and Range Experiment Station, Forest Service, U.S.
Department of Agriculture, - Douglas fir - 18 pages. Microsite Influences on Variability in Douglas-Fir Seedling Development Article (PDF Available) in Western Journal of Applied Forestry 22(3) July with 41 Reads How we measure 'reads'.
Seed germination and seedling establishment are particularly important steps in tree range expansion under warmer conditions, yet seedling establishment is influenced by a range of factors beyond temperature, including herbivory, microenvironment, and the timing and amount of precipitation.
Douglas firs had higher rates of ectomycorrhizal fungal diversity, richness, and photosynthetic rates when planted alongside root systems of mature Douglas firs and Betula papyrifera than compared to those seedlings who exhibited no or little growth when isolated from mature trees.
A nursery is a place where plants are propagated and grown to a desired age. They include retail nurseries which sell to the general public, wholesale nurseries which sell only to businesses such as other nurseries and to commercial gardeners, and private nurseries which supply the needs of institutions or private estates.
Nurseries may supply plants for gardens, agriculture, forestry and. One goal of fuels treatments is to limit potential fire behavior by reducing overstory tree density, but this may precipitate regeneration, which cont.
Some factors affecting Douglas-fir seedling growth and establishment Public Deposited. Analytics × Add. Page | 9 Seedling Establishment Environment Planting of seedlings is a more common way for establishing coastal Douglas-fir. Seedling establishment is an important phase of coastal Douglas-fir planting, because during this stage, the seedling is trying.
A greenhouse bioassay was used to compare the growth, ectomycorrhiza formation, and foliar nutrient concentrations of Douglas-fir seedlings grown in soils collected. A comprehensive literature review of the factors affecting the survival of planted Douglas-fir seedlings is presented.
Original data from operational planting trials was analyzed to determine the effect of some seedling, planting and environmental factors on survival. The use of 2+1 stock was found to result in increased survival of fall-planted seedlings, but not of spring planted seedlings.
Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link). Population Size. Score 0 - Large: Generally >, individuals.
Range Extent. Score 0 - Widespread species within Montana (occurs in 5% or more of the state or generally occurring in 6 or more sub-basins.) as well as outside of Montana.
Area of Occupancy. Score 0 - High: Occurs in >25 Subwatersheds (6th Code HUC’s). Environmental Specificity. Score 0 - Low: Species is a generalist.
Certain factors affecting establishment of the Douglas fir (Pseudotsuga taxifolia (Lamb.) Britt.) seedlings Public Deposited. Douglas-fir trees are the most common victims, but stress due to the weather is affecting many tree species and a variety of different problems are showing up.
'Flare-out' Symptoms of flare-out on young Douglas-fir trees include branches, tops, and sometimes whole trees turning red or brown and dying.
Older trees typically have milder symptoms. Triclopyr and 2,4-D can be used selectively (but avoid high rates; see label) over Douglas-fir seedlings but will injure ponderosa pine and noble fir.
Glyphosate and imazapyr can be used selectively to favor conifers only in late summer or early fall. Tree - Tree - Tree structure and growth: In the section Ecological and evolutionary classification, it is pointed out that land plants are descended from aquatic plants.
The early aquatic plants required few modifications for structural support or water and nutrient absorption, since the surrounding water fulfilled their needs. The water, far denser than the air, buoyed the plant body; the. The Douglas-fir tussock moth is an important defoliator of true firs and Douglas-fir in Western North America because the larvae feed on current year's foliage, causing it to shrivel, turn brown and possibly kill or top-kill the tree.A new survey finds a disease affecting Douglas fir trees has spread to more thanacres Appeared in print: Wednesday, Aug.
24,page A1 An increasing number of Douglas fir trees in the Oregon Coast Range are suffering from a fungal disease known as Swiss needle cast, which is stunting the growth of the trees by about 50 percent and.We used rope techniques to access epiphyte communities on nine large and structurally complex redwoods (Sequoia sempervirens) occupying old-growth forest reserves of northwestern California.
All species of epiphytic lichens, bryophytes and vascular plants were recorded, biomass of dominant vascular epiphytes (Polypodium scouleri and Vaccinium ovatum) was quantified, and tree crowns .