Effects of Site Preparation on Douglas-Fir Seedling Growth and Survival

1990 ◽  
Vol 5 (2) ◽  
pp. 49-51 ◽  
Author(s):  
Don Minore ◽  
Howard G. Weatherly
Keyword(s):  
Pseudotsuga Menziesii ◽  
Seedling Growth ◽  
Height Growth ◽  
Site Preparation ◽  
Douglas Fir ◽  
Progeny Test ◽  
Seedling Height ◽  
Soil Humus ◽  
Growth And Survival ◽  
Mechanical Site Preparation

Abstract The effects of five yarding-slash treatment combinations on Douglas-fir (Pseudotsuga menziesii) growth and survival were compared by obtaining seedling heights, potential seedling heights, survival percentages, soil-penetration resistances, and the occurrence of visible soil-humus for 149 progeny-test plantations in western Oregon. Survival was not improved by mechanical site preparation, and seedlings grown on the compacted, low-humus soils associated with piling slash off site did not grow as tall during their first 5 years as seedlings growing on similar sites where slash had been broadcast-burned. Tilling (disking or ripping) did not benefit seedling height growth. West. J. Appl. For. 5(2):49-51, April 1990.

scholarly journals A Comparison of Herbicide and Mulch Mat Treatments for Reducing Grass, Herb, and Shrub Competition in the BC Interior Douglas-Fir Zone—Ten-Year Results

2005 ◽  
Vol 20 (3) ◽  
pp. 167-176 ◽  
Author(s):  
G. J. Harper ◽  
P. G. Comeau ◽  
B. S. Biring
Keyword(s):  
Soil Moisture ◽  
Seedling Growth ◽  
Height Growth ◽  
Douglas Fir ◽  
Effective Control ◽  
Soil Drought ◽  
Plastic Mulch ◽  
Growth And Survival ◽  
Growing Seasons ◽  
Soil Moisture Availability

Abstract We present results from a study established in 1993 in the Interior Douglas-fir biogeoclimatic zone of southwestern British Columbia to test the effectiveness of several herbicide and mulch mat treatments for reducing grass, herbaceous, and shrub competition. The effectiveness of the preplant herbicide applications of hexazinone (Velpar L) at 2.1 kg ai/ha, glyphosate (Vision) at 2.1 and 1.0 kg ai/ha, and the installation of plastic mulch mats (Tredegar 90 × 90-cm mats) for controlling competing vegetation, improving seedling growth and survival of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings and improving soil moisture availability was evaluated. Ten-year results indicate that application of hexazinone and glyphosate enhanced the survival, diameter, and height growth of planted Douglas-fir seedlings. These herbicide treatments provided effective control of grass and herbaceous vegetation for three to four growing seasons. Plastic mulch mats did result in improvements in growth and survival, but these were not statistically different from untreated seedlings. The results of soil moisture monitoring from within the various treatments indicated delay in the onset of soil drought as a key determinant of the seedling growth improvement noted. West. J. Appl. For. 20(3):167–176.

scholarly journals Soil texture and other site-level factors differentially affect growth of Scotch broom (Cytisus scoparius) and Douglas-fir (Pseudotsuga menziesii) seedlings in the western Pacific Northwest

2021 ◽  
Author(s):  
David Carter ◽  
Robert A. Slesak ◽  
Timothy B. Harrington ◽  
Anthony W. D’Amato
Keyword(s):  
Pacific Northwest ◽  
Pseudotsuga Menziesii ◽  
Height Growth ◽  
Douglas Fir ◽  
Western Pacific ◽  
Limiting Factor ◽  
Cytisus Scoparius ◽  
Invasive Shrub ◽  
Scotch Broom ◽  
The Western Pacific

The invasive shrub Scotch broom (Cytisus scoparius (L.) Link) is a pervasive threat to regenerating Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) stands in the Pacific Northwest, USA. Field observations indicate that the susceptibility of areas to Scotch broom invasion and dominance can vary by site. We selected ten sites throughout the western Pacific Northwest that spanned a gradient of soil textures and other factors to test the site-specific susceptibility of Douglas-fir to overtopping by Scotch broom. We expected to find that the ability of Scotch broom to dominate a site was mediated by site-level factors, particularly those influencing soil water – the most limiting factor to growth in the region. We found Scotch broom and Douglas-fir were inversely affected by site-level factors. In general, Douglas-fir absolute height growth rates were more competitive with those of Scotch broom on fine-textured soils than on more coarsely textured soils. We also found Douglas-fir to have a more dramatic response to increasing down woody material than Scotch broom. Scotch broom height growth approached an asymptote at 3 m. Sites with fast-growing Douglas-fir were able to surpass this height six to seven years after planting and appear likely to avoid suppression by Scotch broom.

Factors related to seedling growth in a boreal Scots pine stand: a spatial analysis of a vegetation–soil system

1993 ◽  
Vol 23 (10) ◽  
pp. 2101-2109 ◽  
Author(s):  
Timo Kuuluvainen ◽  
Timo J. Hokkanen ◽  
Erkki Järvinen ◽  
Timo Pukkala
Keyword(s):  
Soil Properties ◽  
Scots Pine ◽  
Seedling Growth ◽  
Mineral Soil ◽  
Height Growth ◽  
Understory Vegetation ◽  
Small Scale ◽  
Theory Approach ◽  
Seedling Height ◽  
Canopy Trees

The spatial structure of vegetation and soil properties of a patchy Scots pine (Pinussylvestris L.) forest of 1 ha was described and examined in relation to the height growth of pine seedlings in the understory. Measured ecosystem properties included the distribution and sizes of canopy trees, within-stand radiation regime, composition of understory vegetation, and topsoil and mineral soil properties. The joint distance dependent effects of large trees were described as the influence potential, derived from the ecological field theory approach. The variation in understory vegetation and soil characteristics was described as score values, derived from multivariate analyses, summarizing the variation of multiple measured variables; factor analysis was used for topsoil and mineral soil properties and canonical correspondence analysis was used for understory species composition. The spatial variation of variables was examined and mapped using geostatistical techniques. The influence potential of canopy trees, as determined by their size and spatial distribution, correlated most strongly with seedling growth, so that the height growth of seedlings was retarded in the vicinity of trees. Correlations suggest that canopy trees also affected seedlings indirectly through their dominating effect on the properties of understory vegetation and humus layer. The mineral soil nutrient content showed a weak positive correlation with seedling height growth. All the factors related to seedling growth showed substantial small-scale variation across the 1-ha study site. The analysis suggests that the variation in seedling height growth in the understory of the studied Scots pine stand is largely caused by the spatial heterogeneity of both above- and below-ground factors and by the joint effect of their complex interaction.

Comparison and Development of Height Growth and Site Index urves for Douglas-Fir in the Inland Northwest

1989 ◽  
Vol 4 (3) ◽  
pp. 85-88
Author(s):  
James L. Vander Ploeg ◽  
James A. Moore
Keyword(s):  
Pseudotsuga Menziesii ◽  
Model Development ◽  
Analysis Data ◽  
Site Index ◽  
Height Growth ◽  
Douglas Fir ◽  
Western Montana ◽  
Stem Analysis ◽  
Inland Northwest ◽  
Central Idaho

Abstract Stem analysis data from Douglas-fir (Pseudotsuga menziesii) collected throughout the inland Northwest were used for testing height growth and site index equations. The equations performed well in northern and central Idaho, northeast Oregon, and northeast Washington on vegetative types similar to those sampled in model development. However, if the equations were applied on drier sites outside the original geographic study area, overestimates of height growth and under-estimates of site index could result. Therefore, revised height growth and site index equations are presented for western Montana and central Washington. West. J. Appl. For. 4(3):85-88, July 1989.

Effects of sowing time and container type on height growth and survival of seedlings of Eucalyptusregnans

1979 ◽  
Vol 9 (4) ◽  
pp. 478-483
Author(s):  
J. D. Kellas ◽  
J. G. Edgar
Keyword(s):  
Height Growth ◽  
Late Winter ◽  
Seedling Height ◽  
Minimum Standard ◽  
Sowing Time ◽  
Growth And Survival ◽  
Percentage Survival ◽  
Stems And Leaves ◽  
Container Type ◽  
Survival Of Seedlings

The height growth and survival of E. regnans F. Muell. seedlings raised in six container types following sowings made at six different times were studied in the nursery and 14 months after outplanting. Seedling height growth during the nursery stage was directly related to container volume and was modified by cold hardening of stems and leaves. Time of sowing influenced survival of outplanted seedlings; however, percentage survival generally satisfied the minimum standard of 1000 trees/ha. The seedlings raised in Jiffy pot 522 (33 mL) were significantly smaller than seedlings raised in Paperpot FH415S (170 mL), Jiffypot 515 (61 mL), Styroblock 2 (40 mL), and Styroblock 8 (125 mL). Container types Paperpot FH415S and Styroblock 8 produced seedlings suitable for present prescriptions of 25–30 cm as required by the Forest Commission in Victoria. However, growth and survival, although variable, were satisfactory for most container types when sown throughout the summer for late winter outplanting.

HEIGHT GROWTH LOSSES DUE TO ANIMAL FEEDING IN DOUGLAS FIR PLANTATIONS, VANCOUVER ISLAND, B.C.

1964 ◽  
Vol 40 (3) ◽  
pp. 298-307 ◽  
Author(s):  
K. J. Mitchell
Keyword(s):  
Pseudotsuga Menziesii ◽  
East Coast ◽  
Growth Curves ◽  
Tree Height ◽  
Vancouver Island ◽  
Height Growth ◽  
Douglas Fir ◽  
Average Height ◽  
Animal Feeding ◽  
Rotation Age

Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantations on the east coast of Vancouver Island, British Columbia, were examined to determine the effect of animal feeding upon height growth.Length of internodes and evidence of past leader damage were recorded and cumulative average height-age growth curves compared for undamaged trees and for trees suffering various intensities of damage.The average reduction in tree height attributable to animal feeding in heavily browsed plantations varied from one-half to two feet over a period of 8 to 10 years. It is unlikely that either tree volume or quality at rotation age would be seriously affected.Exposed trees were browsed more heavily than those protected by vegetation or logging slash.

Effects of tree cover, understory vegetation, and litter on regeneration of Douglas-fir (Pseudotsuga menziesii) in southwestern Argentina

1998 ◽  
Vol 28 (5) ◽  
pp. 683-692 ◽  
Author(s):  
F D Caccia ◽  
C L Ballaré
Keyword(s):  
Seed Germination ◽  
Pseudotsuga Menziesii ◽  
Seedling Emergence ◽  
Canopy Cover ◽  
Douglas Fir ◽  
Understory Vegetation ◽  
Tree Cover ◽  
Growth And Survival ◽  
Thermal Environments ◽  
Seedling Predation

The factors and processes that regulate Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) natural regeneration in southwestern Argentina are unknown. We investigated (i) the germination responses of P. menziesii seeds to variations in the radiation and thermal environments imposed by canopy cover and litter, (ii) the effects of litter on seedling emergence, and (iii) the effects of understory vegetation on seedling performance and seed and seedling predation. Seed germination was high in darkness and under canopies. Under a combination of canopy types and litter covers, germination showed a negative correlation with temperature between 23 and 40°C. Germination was not altered by changes in red/far-red ratio. These results suggest that the presence of an overstory canopy promotes P. menziesii seed germination compared with a no-canopy situation (e.g., a clearcut). Litter inhibited seedling emergence by reducing water availability and by acting as a mechanical barrier. Understory vegetation (established saplings) reduced seedling growth and survival. However, our results suggest that direct competition between seedlings and understory vegetation is not the principal force regulating regeneration; indirect effects appear to be of paramount importance because P. menziesii seed and seedling consumption (presumably by rodents) is greatly encouraged by the presence of dense vegetation patches in the understory.

scholarly journals Intensive Forest Management Affects Loblolly Pine (Pinus taeda L.) Growth and Survival on Poorly Drained Sites in Southern Arkansas

2006 ◽  
Vol 30 (2) ◽  
pp. 79-85 ◽  
Author(s):  
M.S. Rahman ◽  
M.G. Messina ◽  
R.F. Fisher
Keyword(s):  
Forest Management ◽  
Pinus Taeda ◽  
Loblolly Pine ◽  
Site Preparation ◽  
Growth And Survival ◽  
Vegetation Control ◽  
Mechanical Site Preparation ◽  
Intensive Forest Management ◽  
Tree Survival ◽  
Pinus Taeda L

Abstract We investigated if intensive forest management could enhance loblolly pine seedling growth and survival on West Gulf flatwoods where winter and spring waterlogging and frequent summer drought limit loblolly pine performance. Fertilization, chemical vegetation control, and mechanical site preparation (combined bedding and ripping) were tested in different combinations on six sites established in southern Arkansas in early 1999. Loblolly pine (Pinus taeda L.) seedling performance was monitored in the first two growing seasons (1999 and 2000) and fifth growing season (2003) after planting. Fertilization increased growth in all years. Mechanical site preparation affected only height and only until year 2. There was no effect of chemical vegetation control in any measurement year, although chemical vegetation control resulted in greater growth in combination with fertilization than did either treatment applied separately. Tree survival averaged 92% a few months after planting and then decreased significantly at year 1 (77%), and remained comparable until year 5, the last year data were collected. Tree survival was not affected by mechanical site preparation, fertilization, or chemical vegetation control. Intensive forest management can increase loblolly pine seedling growth and survival on poorly drained sites in the West Gulf.

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