Root respiration has limited value for assessing Douglas-fir seedling quality

1987 ◽  
Vol 17 (9) ◽  
pp. 1144-1147 ◽  
Author(s):  
Douglas D. McCreary ◽  
Joe B. Zaerr
Keyword(s):  
Respiration Rate ◽  
Root Respiration ◽  
Rapid Heating ◽  
Douglas Fir ◽  
Seedling Quality ◽  
Root Damage ◽  
Quality Test ◽  
Response Period ◽  
Growth Room ◽  
Survival And Growth

Root damage is a principal cause of poor seedling quality. Currently, the most widely used seedling-quality test measures a seedling's ability to initiate and elongate roots in a favorable environment; however, this test requires a lengthy response period and tedious, time-consuming measurements. Alternatively, the respiration rate of roots could be measured much more quickly and easily. Results of this study, which examined whether root respiration could successfully predict the survival and growth of potted Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings in a growth room, indicated that respiration may help assess root damage caused by desiccation but not that caused by freezing, hot storage, or rapid heating.

scholarly journals Root Growth Potential and Microsite Effects on Conifer Seedling Establishment in Northern Idaho

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 597
Author(s):  
Jacob A. Reely ◽  
Andrew S. Nelson
Keyword(s):  
Root Growth ◽  
Douglas Fir ◽  
Seedling Quality ◽  
Growth Potential ◽  
Larix Occidentalis ◽  
Root Growth Potential ◽  
Western Larch ◽  
Neighborhood Conditions ◽  
Seedling Performance ◽  
Survival And Growth

Environmental conditions and seedling quality interact to produce complex patterns of seedling survival and growth. Root growth potential (RGP) is one metric of seedling quality that can be rapidly measured prior to planting, but the correlation of RGP and seedling performance is not consistent across studies. Site factors including microsite objects that cast shade and competing vegetation can also influence seedling performance. We examined the effects of RGP, presence/absence of a microsite object, and competition cover on the survival and growth of three native conifers to the Inland Northwest, USA, over 5 years. We found that RGP had no effect on the survival or growth of western larch (Larix occidentalis), Douglas fir (Pseudotsuga menziesii var. glauca), and grand fir (Abies grandis) at a mesic north aspect site and a xeric south aspect site. Comparatively, the presence of a microsite increased the odds of survival by 37% for western larch and 158% for grand fir, while the absence of forb cover increased the odds of survival of western larch by 72% and of grand fir by 26%. Douglas fir was less sensitive to microsites and competition. The strong effects of neighborhood conditions around seedlings help inform silvicultural practices to enhance the establishment of western larch and grand fir, including planting seedlings near shading objects and competition control, while these practices may not be as important for Douglas fir.

scholarly journals Survival, and Growth Response of Douglas-Fir Trees to Increasing Levels of Bole, Root, and Crown Damage

2018 ◽  
Vol 65 (2) ◽  
pp. 143-155 ◽  
Author(s):  
Dryw A Jones ◽  
Constance A Harrington ◽  
David Marshall
Keyword(s):  
Growth Response ◽  
Douglas Fir ◽  
Survival And Growth

scholarly journals Survival and Growth of Douglas-Fir Relating to Weeding, Fertilization, and Seed Source

1996 ◽  
Vol 11 (2) ◽  
pp. 62-69 ◽  
Author(s):  
Brian E. Roth ◽  
Michael Newton
Keyword(s):  
Weed Control ◽  
Nitrogen Fertilization ◽  
Seedling Survival ◽  
Seed Orchard ◽  
Douglas Fir ◽  
Seed Source ◽  
Interactive Effects ◽  
Dominant Factor ◽  
Local Source ◽  
Survival And Growth

Abstract The goal of this study was to quantitatively evaluate the individual and interactive effects of weed control, nitrogen fertilization, and seed source on Douglas-fir (Pseudotsuga menziesii) survival and growth in a range of sites and growing conditions in western Oregon. Weed control was the dominant factor influencing seedling survival and growth and accounted for 49% of the explained variation in seedling volume after 2 yr. Nitrogen fertilization had no effect when used in conjunction with weed control and a negative effect when used without weed control. Seedlings from a seed orchard source were significantly larger in diameter and volume than those from a wild local source after two growing seasons, but second-year heights were similar for the two seedling types. Initial seedling size was positively correlated with growth rate. West. J. Appl. For. 11(2):00-00.

Effects of logging debris treatments on five-year development of competing vegetation and planted Douglas-fir

2010 ◽  
Vol 40 (3) ◽  
pp. 500-510 ◽  
Author(s):  
Timothy B. Harrington ◽  
Stephen H. Schoenholtz
Keyword(s):  
Forest Regeneration ◽  
Timber Harvest ◽  
Douglas Fir ◽  
Soil Productivity ◽  
Short Term ◽  
Vegetation Control ◽  
Competing Vegetation ◽  
Scotch Broom ◽  
Considerable Research ◽  
Survival And Growth

Although considerable research has focused on the influences of logging debris treatments on soil and forest regeneration responses, few studies have identified whether debris effects are mediated by associated changes in competing vegetation abundance. At sites near Matlock, Washington, and Molalla, Oregon, studies were initiated after timber harvest to quantify the effects of three logging debris treatments (dispersed, piled, or removed) on the development of competing vegetation and planted Douglas-fir ( Pseudotsuga menziesii (Mirb.) Franco var. menziesii ). Each debris treatment was replicated with initial and annual vegetation control treatments, resulting in high and low vegetation abundances, respectively. This experimental design enabled debris effects on regeneration to be separated into effects mediated by vegetation abundance and those independent of vegetation abundance. Two to three years after treatment, covers of Scotch broom ( Cytisus scoparius (L.) Link) at Matlock and trailing blackberry ( Rubus ursinus Cham. & Schltdl.) at Molalla were over 20% greater where debris was piled than where it was dispersed. Debris effects on vegetation abundance were associated with 30% reductions in the survival of Douglas-fir at Matlock (r2 = 0.62) and the stem diameter at Molalla (r2 = 0.39). Douglas-fir survival and growth did not differ among debris treatments when effects were evaluated independent of vegetation abundance (i.e., with annual vegetation control), suggesting negligible short-term effects of debris manipulation on soil productivity.

Effects of four fungicides on survival and growth of containerized Douglas-fir seedlings: greenhouse performance

1980 ◽  
Vol 10 (3) ◽  
pp. 423-425
Author(s):  
Walter G. Thies ◽  
Peyton W. Owston ◽  
Dian C. Hansen
Keyword(s):  
Disease Control ◽  
Control Strategies ◽  
Douglas Fir ◽  
Phytotoxic Effects ◽  
Survival And Growth

Several disease control strategies were tested on Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings grown in a greenhouse-shadehouse facility in western Oregon. Potting mixture was exposed to two pasteurization treatments combined factorially with four fungicides (benomyl, captan, fenaminosulf, and ethazol) and three application schedules (pregermination drench, postgermination drenches, and a combination of pre- and post-germination drenches). Both pasteurization of the potting mixture and applications of fenaminosulf caused statistically significant phytotoxic effects.

Pure culture synthesis of ectomycorrhizae by Thelephora terrestris and Pisolithus tinctorius on different conifer hosts

1970 ◽  
Vol 48 (3) ◽  
pp. 639-643 ◽  
Author(s):  
Donald H. Marx ◽  
W. Craig Bryan
Keyword(s):  
Plant Growth ◽  
Norway Spruce ◽  
Pure Culture ◽  
Douglas Fir ◽  
Pisolithus Tinctorius ◽  
Thelephora Terrestris ◽  
Fungal Symbiont ◽  
Growth Room ◽  
Pure Culture Synthesis

In a special plant-growth room, isolates of Thelephora terrestris produced basidiocarps and formed typical ectomycorrhizae with seedlings of bristlecone, jack, sand, lodgepole, shortleaf, slash, sugar, Austrian, longleaf, cluster, ponderosa, red, pitch, eastern white, Scots, loblolly, and Virginia pines and Douglas fir. Atypical mycorrhizae (lacking mantle) were formed on seedlings of Norway spruce and jack, Japanese red, and Himalayan pines. The formation of atypical mycorrhizae was considered a result of differences in the symbiotic–parasitic nature of the fungal symbionts on different hosts. Pisolithus tinctorius formed typical mycorrhizae with seedlings of jack, sand, Japanese red, shortleaf, slash, Austrian, longleaf, cluster, red, pitch, eastern white, Scots, loblolly, and Virginia pines. Reisolation of specific fungal symbionts from mycorrhizae of several pine hosts was successful.Mycorrhizae formed by T. terrestris were macroscopically and microscopically different from those of P. tinctorius, but mycorrhizae formed by different isolates of T. terrestris were indistinguishable from each other, regardless of host. These results suggest that the fungal symbiont determines color and morphology of ectomycorrhizae.

Effects of Environment on Growth and Survival of Douglas-fir Transplants

1974 ◽  
Vol 4 (2) ◽  
pp. 193-200
Author(s):  
E. B. Tregunna ◽  
M. Crown
Keyword(s):  
Storage Time ◽  
Water Status ◽  
Douglas Fir ◽  
Planting Date ◽  
Growth And Survival ◽  
Lower Elevation ◽  
Survival And Growth ◽  
And Storage ◽  
Root Treatment ◽  
Spring Planting

Variation in lifting date, planting date, planting site, seedling history, root treatment, and storage time were tested for their effects on Douglas-fir transplants. Survival, water status, types of damage, and both shoot and root growth were measured. Survival decreased with later spring planting date in the field, but this was partly offset by trends in browsing. Survival was greater at the lower elevation. Differences in seed lot, or conditions in the nursery, resulted in differences in tree size, which had some effects because the larger trees were browsed more. Survival and growth were not markedly different between root treatments. Cold storage increased survival of trees lifted late in the spring. The relative turgidity of leaves from bareroot trees in storage was related to lifting date and subsequent survival. Survival decreased severely as lifting date progressed through March.

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