Keyword: seedling
- Field studies of seed biology.
http://www.for.gov.bc.ca/hre/pubs/pubs/0184.htm
Except in limited areas where there is enough advance regeneration, establishment of forest cover on harvested lands continues to depend on seedling planting programs or on natural regeneration by seeds. Whereas successful plantation programs depend primarily on plant competition and site variables at the time of planting, successful natural regeneration depends not only on the availability of seeds, but on favourable environmental conditions throughout the processes of seed production, dispersal, germination, and seedling establishment. Site preparation and other silvicultural treatments can improve the suitability of the seedbed and its micro-environment, but there is still much we do not understand about how various factors contribute to successful forest establishment. We have gained some insights, under controlled conditions, about the influence of major factors such as light and temperature, but we have limited experience with biological responses under actual conditions in the field. Anyone ...
- A comparison of mulch mat and herbicide treatments for reducing grass competition in the IDFww.
http://www.for.gov.bc.ca/hre/pubs/pubs/0220.htm
rial was established to explore vegetation management options that may improve conifer survival and growth within the IDFww. The objectives of this study were to compare the effectiveness of the herbicides hexazinone and glyphosate and plastic mulch mat treatments for reducing grass competition and improving Douglas-fir seedling performance. Two separate experiments were established, representing dry and mesic environments within areas of homogenous terrain and vegetation. This extension note summarizes the five-year results from these two experiments. ...
- Mackay River herbicide trial: conifer response 9 years post-treatment.
http://www.for.gov.bc.ca/hre/pubs/pubs/0228.htm
In 1986, glyphosate, 2,4-d amine, 2,4-d ester, and manual brushing treatments were applied to a 4-year-old fireweed/shrub community in the ESSFwk1 biogeoclimatic subzone, for the purpose of releasing Picea glauca × engelmannii (hybrid spruce) seedlings. Competing vegetation was heavily affected for at least 1 year following application of glyphosate at a rate of 2.1 kg ai/ha. Spruce seedlings were also damaged by the herbicide, resulting in a net reduction in growth rates for 1986-1987. Manual brushing and 2,4-d amine treatments reduced vegetation cover less than glyphosate, while 2,4-d ester had little effect. The trial was remeasured in 1995, 9 years post-treatment, to determine whether there were any long-lasting effects of treatment on growth and condition of planted spruce seedlings. Spruce seedlings in plots treated with glyphosate were significantly larger overall than seedlings located in the other treatments. Statistical analysis showed significant differences in spruce seedling root co ...
- Introduction to logistic regression models: with worked forestry examples.
http://www.for.gov.bc.ca/hre/pubs/pubs/0407.htm
Logistic regression is a useful tool for analyzing data that includes categorical response variables, such as tree survival, presence or absence of a species in quadrats, and presence of disease or damage to seedlings. The models work by fitting the probability of response to the proportions of responses observed. For instance, the number of outplanted seedlings in 50-tree rows that die from frost damage is an observed response. These observed numbers are converted to proportions which are then fitted by models that determine the probability that a seedling will die from frost damage. Normal distribution approximations to the proportions and the consequent analytical methods (e.g., regression and analysis of variance) can be used if large sample sizes exist for each experimental unit. However, logistic regression does not require large sample sizes for the data analysis to be feasible. Furthermore, it is possible to analyze individual tree data. ...
- Microsite effects on seedling establishment in an Engelmann spruce subalpine fir ecosystem: Interior British Columbia.
http://www.for.gov.bc.ca/hre/pubs/pubs/0414.htm
Microsite effects on seedling establishment in an Engelmann spruce subalpine fir ecosystem: Interior British Columbia. ...
- Long-nights and moisture stress affect Douglas-fir seedling growth, cold hardiness, dormancy and root growth potential.
http://www.for.gov.bc.ca/hre/pubs/pubs/0543.htm
Long-nights and moisture stress affect Douglas-fir seedling growth, cold hardiness, dormancy and root growth potential. ...
- NAA effects on conifer seedlings in British Columbia.
http://www.for.gov.bc.ca/hre/pubs/pubs/0544.htm
In R. Rose, S.J. Campbell, and T.D. Landis. (editors). Target seedling symposium. Proc. combined meetings of the Western Forest Nursery Assns. - !990. USDA For. Serv. Gen. Tech. Rep. RM-200. ...
- When to measure seedling quality in bareroot nurseries.
http://www.for.gov.bc.ca/hre/pubs/pubs/0550.htm
When to measure seedling quality in bareroot nurseries. ...
- Response of lodgepole pine seedlings to simulated cattle damage.
http://www.for.gov.bc.ca/hre/pubs/pubs/0640.htm
Wounds were artificially applied to 2-year-old lodgepole pine seedlings in order to simulate the type of damage that commonly occurs when cattle trample or browse tree seedlings. Specifically, this study investigated the effects of basal scarring and leader damage on survival and growth of lodgepole pine (Pinus contorta var. latifolia Engelm.) seedlings, at two phenological stages (during and after terminal elongation). Tree seedling survival was unaffected by the damage treatments. Observed seedling mortality in adjacent cattle-grazed pastures is therefore unlikely to be due to trampling or browsing damage alone. A combination of factors, such as sub-optimal growing conditions or vegetation competition, along with trampling and/or browsing damage, may explain seedling mortality on grazed pastures. The damage treatments resulted in growth losses in lodgepole pine, depending on the timing of the damage. Basal scars exceeding 25% of the stem circumference reduced diameter increment by as much ...
- Tree seedling damage on grazed clearcuts.
http://www.for.gov.bc.ca/hre/pubs/pubs/0645.htm
Tree seedling damage on grazed clearcuts. ...
- Tree seedling damage on grazed clearcuts.
http://www.for.gov.bc.ca/hre/pubs/pubs/0654.htm
Tree seedling damage on grazed clearcuts. ...
- Age structure and growth of the tree-seedling bank in subalpine spruce-fir forests of south-central British Columbia.
http://www.for.gov.bc.ca/hre/pubs/pubs/1003.htm
Age structure and growth of the tree-seedling bank in subalpine spruce-fir forests of south-central British Columbia. ...
- Quantum leak: Estimating stress damage in nursery seedlings.
http://www.for.gov.bc.ca/hre/pubs/pubs/1059.htm
BC Ministry of Forests Seed and Seedling Extension Topics. pp. 2-6. ...
- Physiological tests of conifer seedling quality: Implementing operational measurement of chlorophyll fluorescence and electrolyte leakage.
http://www.for.gov.bc.ca/hre/pubs/pubs/1064.htm
Physiological tests of conifer seedling quality: Implementing operational measurement of chlorophyll fluorescence and electrolyte leakage. ...
- How light conditions affect tree seedling performance in the Interior Cedar-Hemlock Subzone: Preliminary Results-EP1191.
http://www.for.gov.bc.ca/hre/pubs/pubs/1133.htm
How light conditions affect tree seedling performance in the Interior Cedar-Hemlock Subzone: Preliminary Results-EP1191. ...
- Age structure and growth of the tree-seedling bank in subalpine spruce-fir forests of south-central British Columbia.
http://www.for.gov.bc.ca/hre/pubs/pubs/1143.htm
Age structure and growth of the tree-seedling bank in subalpine spruce-fir forests of south-central British Columbia. ...
- Genetics of seed and seedling traits in yellow-cedar.
http://www.for.gov.bc.ca/hre/pubs/pubs/1265.htm
Genetics of seed and seedling traits in yellow-cedar. ...
- Comparison of yellow cypress trees of seedling and rooted cutting origins after 9 and 11 years in the field.
http://www.for.gov.bc.ca/hre/pubs/pubs/1272.htm
Comparison of yellow cypress trees of seedling and rooted cutting origins after 9 and 11 years in the field. ...
- Yellow-cedar stecklings: Nursery production and field performance.
http://www.for.gov.bc.ca/hre/pubs/pubs/1274.htm
Stecklings, or plantable rooted cuttings, are the primary propagule type used for artificial regeneration of yellow cedar (Chamaecyparis nootkatensis (D. Don) Spach.) in British Columbia. An increase in logging of this species resulted in a greater demand for planting stock which, due to infrequent cone crops, and seed which usually has poor germination success, cannot be met by seedling production. From 1975 to 1986, over 50% of all yellow-cedar stock planted in British Columbia were stecklings. This report synthesizes 15 years worth of research results and operational experiences concerning nursery production and field performance of yellow-cedar stecklings. ...
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