3 edition of Factors affecting cone and seed production in Douglas Fir found in the catalog.
Factors affecting cone and seed production in Douglas Fir
Anna Maria Colangeli
|Statement||by Anna M. Colangeli, John N. Owens, Sheila J. Morris.|
|Series||FRDA report -- 057.|
|Contributions||Owens, John N., Morris, Sheila J.|
|The Physical Object|
|Pagination||13,  leaves :|
|Number of Pages||13|
|LC Control Number||89092049|
interior spruce, interior Douglas-fir, western larch, and red alder reliable source of seed for their production. Cone collection in our orchards began in the late ’s, and continued as we changed from close eye on all the factors affecting cone development and ripening. In conclusion, it would be interesting to know how. Insect parasitism of Douglas fir megagametophytes alters seed development in two different ways. The first effect is on unpollinated megagametophytes that normally die within a few weeks of the unfertilized plant egg degenerating (Owens et by:
Physiology and growth of containerized coastal Douglas fir seedlings given different durations of short days to induce dormancy. MacDonald, Joanne E.; Owens, J.N. in the growing season and had a substantial impact on seed production. A newly discovered cone-feeding weevil (Lepesoma lecontei) caused a large proportion of this abortion. Unexplained cone abortion (possibly frost damage), empty and aborted seed, Douglas-fir cone gall midge (Contarinia oregonensis) and Douglas-fir seed.
Forest regeneration needs to be applied under the direction of silvicultural prescriptions and the context of silvicultural systems. Management interventions should be implemented if the current or expected stand conditions are unfavourable for target species to achieve management objectives. To illustrate these concepts, this paper uses coastal Douglas-fir (Pseudotsuga menziesii var Author: Qinyu Cai. In the Canterbury high country lodgepole pine ranks second behind Corsican pine, and ahead of Douglas-fir and European larch (Belton and Ledgard, ). Of the total of 17, ha affected in Canterbury, lodgepole pine was present in ha, or 26%. 3. Factors affecting natural regeneration Seed productionCited by:
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The causes of reduced seed yield in four Douglas fir (Pseudotsuga menziesii Mirb. Franco) trees at the Dewdney Seed Orchard in were found to be inadequate pollination (30%), low pollen vigour or viability (14%), embryo abortion (14%) and early ovule abortion (5%).
The average seed efficiency (+ s.e.) for the four trees was 40 (+ 7). Cone and seed development in Douglas-fir were studied from pollination until seed release in Cone abortion at, and shortly after, pollination was high, resulting from a combination of low temperatures and possibly high moisture and populations of microorganisms on cones.
Seed potential averaged about 75 seeds per cone with 31 filled seed per cone, giving an average seed efficiency Cited by: Abstract. This chapter summarizes current technology concerning cone collection and seed processing, testing, storage, and stratification for the six major conifer species—Douglas-fir, ponderosa pine, lodgepole pine, noble fir, white fir, and western hemlock—produced as seedlings in Northwest bareroot by: Thirty-six-year records of Douglas-fir and grand fir cone counts were analyzed with eight climatic variables to find which combinations of climatic factors were related to the induction of reproductive buds and the successful development of the by: Cone Production of Douglas-fir and Grand Fir and its Climatic Requirements Article in Canadian Journal of Forest Research 3(1) February with 27 Author: S.
Eis. Cone production and radial growth increment were studied for 8 years in a Douglas fir (Pseudotsuga menziesii) seed orchard on Vancouver Island, British Columbia, in trees representing 29 open-pollinated (half-sib) families.
Genetic correlations for the two traits were compared for each of the 8 years. i) Parental balance based on seed-cone production In an attempt to estimate the parental balance of a clonal/seedling Douglas-fir seed orchard, individual tree cone-counts were conducted at harvest over the period.
Variation in cone production among families and clones over the eight-year-period revealed the following: 1) seedling trees. The reproductive capacity in nine Mexican Douglas-fir populations was determined by analyzing seed production traits from trees collected in Significant variation was found for all traits among populations; they contributed between 21% and 43% of total phenotypic variation found in these traits, indicating broad differences in Cited by: Unretrieved seeds in Clark's nutcracker caches may have a better change of establishment than wind-dispersed seed [80,81].
Seed predation: Caching of Douglas-fir cones by the Douglas's squirrel, and foraging for seeds on the ground by chipmunks, mice, voles, and birds reduces seed quantity considerably .
Coastal Douglas-fir Stratification A significant proportion of coastal Douglas-fir (Fdc) regeneration in BC is accomplished using seed imported from the US.
This is due to accelerated logging of Fdc and a lag in BC orchard production to meet this need. Weyerhaeuser Co. primarily supplies the seed and they recommend. Harsh frosts and insects are also responsible for destroying the seed cones before they reach maturity. Older trees have the advantage of producing more cones then the younger ones.
Seeds. The seed size is determined before fertilization even takes place, but there is little variation in seed size coming from one tree. This Research Note brings together information from a number of sources on cone and seed production by the main conifers planted in Britain.
This information can help managers assess the seed resources of • Do species have seed preferences, and what factors affect their choice. being one of the earliest to mature and Douglas fir. bacteria were present on Douglas fir (Pseudotsuga menziesii), and whether they exhibited ice-nucleating properties, are reported.
Total bacteria and fluorescent Pseudomonas populations were monitored on buds, conelets and foliage of five trees in a Douglas fir seed orchard on Vancouver Island, Canada, in. The results of this project are focused on two target users.
Field foresters, who will have a better appreciation of the periodicity between good cone crops, and cone collectors, who will have better information about the biotic (pollen cloud, insects) and abiotic (frost) factors affecting early cone development and seed quality.
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. Many factors affect yield, including weather conditions at time of pollination. Continuous heavy rain throughout the period when female flowers are receptive can reduce the number of successful cross-pollinations and consequent fertilisations, resulting in a low seed set and poor yield per Size: KB.
Seed Collection, Processing and Handling Objectives: •Know the properties of ‘high quality’ seed. •Understand basic seed biology and the reproductive cycles for different BC conifers.
•Be familiar with biotic factors which affect the size and periodicity of seed crops. •Know the different methods of cone Size: 5MB. The cones and seeds of animal-dispersed pines have evolved a number of characteristics that facilitate harvest of seeds by animals, such as less well-defended cones, larger seeds, and loss of seed wings, as the mode of dispersal shifted to animals ( Cited by: considered in detail all the factors affecting the reproduction of this species, including the seed production and seed qualities, but this latter phase of his work is based on very meager information which will serve mainly as an introduction to the present study.
Mason (10) has considered the development of lodgepole pine. Douglas-fir physiology, genetics, and other related issues. It begins with the evolutionary history and distribution of Douglas-fir and provides a detailed description of introductions of Douglas-fir to other countries, including information about initial plantings, provenance trials, and genetic tree improvement activities.
Our analysis of seed production CV p shows that both latitudinal effects and differences among pollen and seed vectors are significant ().The analysis supports the hypothesis that climatic factors influence variability in seed production.
Latitude had significant first and second order terms ().The curvilinear relationship between CV p and latitude is consistent with the Cited by: In addition, some factors may affect Aleppo pine tree growth directly but may be affecting seed and cone production indirectly.
Therefore, reduced stand density results in less competition among Aleppo pine trees and accompanying understory flora, which subsequently increases the stem diameter and other tree dimensions, including seed by: Main Weather factors on Aleppo pine’s seed and cone production In Tunisia. Conference Paper (PDF Available) October with Reads How we measure 'reads'.