Comparative growth of supressed second-growth Douglas fir befor and after release by logging

by Denver P. McComb

Written in English
Published: Pages: 12 Downloads: 986
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  • Douglas fir -- Growth.,
  • Logging -- Environmental aspects.
  • Edition Notes

    Statementby Denver P. McComb.
    The Physical Object
    Pagination12 leaves, bound :
    Number of Pages12
    ID Numbers
    Open LibraryOL15526900M

We characterized the structure of 91 old-growth forests dominated by Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), using inventory data from recent (a??) old-growth timber sales in western Oregon. The data were complete counts (i.e., censuses) of all live trees >20 cm diameter at breast height (dbh, measured at m above the ground) over a mean area of ha at each site. DOUGLAS-FIR GROWTH IN MOUNTAIN ECOSYSTEMS: WATER LIMITS TREE GROWTH FROM STAND TO REGION JEREMY S. LITTELL, 1,2,4 DAVID L. PETERSON,3 AND MICHAEL TJOELKER 2 1JISAO CSES Climate Impacts Group, Box , Seattle, Washington USA 2Fire and Mountain Ecology Laboratory, College of Forest Resources, University of Washington, Box The sole genus in the Grossulariaceae family, Ribes means ‘currant’ in medieval latin. One of about 30 currant and gooseberry species in the Northwest, sanguineum refers to the reddish color of the flowers. It’s one of those native plants that had to be chaperoned by Scottish botanist David Douglas to Britain — where it was introduced into cultivation in the s — before it. A 16 week experiment was conducted to evaluate growth performances, gonads development, carcass and proximate analysis of diploid and triploid Nile tilapia, Oreochromis niloticus. Triploid were induced by inhibiting the second polar body formation in fertilized eggs using heat chock. Newly hatched fry were transferred into reared in 5 liter aquaria for three weeks and then transferred to 80 L.

Second-growth trees = grown to partial maturity after old-growth timber has been cut Secondary forest = contains second-growth trees Smaller trees, very different species and structure Loggers lose their jobs with deforestation As each region is deforested, the timber industry declines and timber companies move on Local loggers lose their jobs. Whitford, Thomas C., "Defining old-growth Douglas-fir forests of central Montana and use of the northern goshawk (Accipiter gentilis) as a management indicator species" (). Graduate Student Theses, Dissertations, & Professional Papers. Get this from a library! Levels-of-growing-stock cooperative study in Douglas-fir. Report no. 9, Some comparisons of DFSIM estimates with growth in the levels-of-growing-stock study. [Robert O Curtis; Pacific Northwest Research Station (Portland, Or.)]. old-growth Douglas-fir stands could be identified with minimum age and minimum dbh used as descriptors. Hence, simplification of old-growth definitions and development of definitions for each forest type were recommended for the LCNF. Differences between old-growth Douglas-fir stands and Douglas-fir goshawk nest stands were significant. The.

After release by logging or windfall, suppressed trees respond with immediate and substantial growth. At lower elevations in the Pacific silver fir zone, Pacific silver fir usually sun scalds when used as leave tree in shelterwood cuttings. Sudden exposure to sunlight temporarily reduces growth.   Elevated atmospheric CO2 concentrations and warming may affect the quality of litters of forest plants and their subsequent decomposition in ecosystems, thereby potentially affecting the global carbon cycle. However, few data on root tissues are available to test this feedback to the atmosphere. In this study, we used fine (diameter 2 mm) and small (2–10 mm) roots of Douglas-fir (Pseudotsuga. season was short, Douglas-fir showed al least 3 changes in the timing of development as compared with milder sites. (1) The cone growth period was reduced more than the seed growth period. (2) The overlap in time of the developmental cycles of cone and seed was increased. (3) Cones and seeds grew during an increased portion of the growing season. The optimal growth problem 13 2 The Hamiltonian Method: 14 A 3-step recipe 14 Intuition for the Hamiltonian approach 16 Working with the FOC 24 3 Finding the Solution 26 The phase diagram 26 Transversality and feasibility 30 Drawing time paths 36 4 Comparative Dynamics Exercises 37 Different levels of impatience

Comparative growth of supressed second-growth Douglas fir befor and after release by logging by Denver P. McComb Download PDF EPUB FB2

Comparative growth of supressed second-growth Douglas fir befor and after release by loggingAuthor: Denver P.

McComb. Object: i The object of this report is to determine the growth of second-growth Douglas fir, Pseudot ug. taxifoita, before and after release by logging «itb specific r-iference to the recov- ery of suppressed trees Instruments: Ti instrurnens used were an increment borer, graduated scale in l/2O, aad diameter tape.

Method of Procedure: Before any nesurements had been taken it was thought. A typical 6-year-old Douglas-fir seedling is shown after 4 years of. field growth. maximum growth in the third or. fourth year after being grafted, but.

seedlings and cuttings were. approximately 2 years behind in. comparable growth. Greater height. growth occurred in grafts than in. cuttings or seedlings because scions. had been. The Douglas fir (Pseudotsuga menisci) is an ornamental tree that is also widely utilized as a Christmas tree.

It claims a medium rate of growth; a medium growth rate, according to the Arbor Day Foundation, signifies a tree Comparative growth of supressed second-growth Douglas fir befor and after release by logging book grows between 13 and 24 inches in height annually.

Wellwood () reported that the wood density of second-growth stands of Douglas-fir was significantly lower on good sites compared with sites of. We proceeded to use those relationships to predict regional growth response under 18 climate change scenarios for the s, s, and s with unexpected results: for comparable changes in heat moisture index, the most southern and outlying populations of Douglas‐fir in Mexico showed the least reduction in productivity.

I can't remember now what thread raised the issue - but there was some talk about second growth douglas fir being weaker than old growth. That seemed wrong to me, but I wanted to research it and see.

I didn't find anything at the FPL website that addressed the issue specifically. Maybe someone else can dig something out. In the WB index, there were several comments in Richard.

The old-growth reference sites had much larger trees, lower densities, and different species composition than young even-aged second-growth stands that arose after clearcutting at HFR (Table 1, Table 2).

Douglas-fir was the most abundant species in young stands, even after PCT to release. measure past growth and estimate future growth. This will allow you to determine: Growth projection factor (GPF) This can be used in conjunction with board-foot or cubic-foot volumes to determine future stand volumes given current growth rates.

Mean annual increment (MAI) This is the average volume growth per year over the life of the stand. Thirty-two full-sib families of coastal Douglas-fir (Pseudotsuga menziesii (Mirb.)Franco var. menziesii) with a range of predicted breeding values were monitored for growth rate, phenology, and cold hardiness over 2 years on two sites to investigate if other traits are being selected when family selection is based on icant differences among families existed in most phenological.

In contrast, Douglas‐fir may exhibit growth increases at some higher elevation sites where seasonal photosynthesis is currently limited by growing‐season length or low growing‐season temperature.

Life‐history processes such as establishment, growth, and mortality are precursors to changes in biogeography, and measurements of climate. Effect of growth rate on the physical and mechanical properties of Douglas-fir in western Europe C.

Pollet, a J.-M. Henin, b J. Hébert, a B. Jourez b a University of Liège (ULg), Gembloux Agro-Bio Tech (GxABT), Forest Resources Management, Passage des.

Height Growth Rate of Douglas-Fir: A Comparison of Model Forms Article (PDF Available) in Forest Science 34(1) March with Reads How we measure 'reads'.

Increased water deficit decreases Douglas fir growth throughout western US forests Christina M. Restainoa,1, David L.

Petersonb, and Jeremy Littellc aDepartment of Environmental Science and Policy, University of California, Davis, CA ; bPacific Northwest Research Station, US Forest Service, Seattle, WA ; and cDepartment of the Interior Alaska Climate Science Center, Anchorage, AK. Systematic research on growth and yield of Douglas-fir began in This line of early research evolved over time and culminated in publication of USDA BulletinThe Yield of Douglas-fir in the Pacific Northwest.

B had an enormous influence on development of Douglas-fir forestry and was. We tested if the timing of flowering phenology could be predicted using phenology models similar to those developed for vegetative budburst and diameter growth initiation (e.g.

Harrington and Gould,Ford et al., ), and, if so, could such models accurately predict the day of year of flowering of Douglas-fir across its range in the.

The scientists then examined how growth rates have changed in the trees over a year time frame, from to Using climate data, they showed that as temperature increases in future decades, climate-induced stress is expected to increase and Douglas fir growth to decrease.

Douglas fir belongs to this group and that its chilling requirements are satisfied by a period of 8—12 weeks of temperature between 3 and 60 C. Presumably, the low tempera- tures initiate the hypothesized sequence in concentration of growth regulators.

Most of the old-growth stands in the Douglas-fir region Rave developed over years since their origin. The most common age classes are probably between and years in the Cascade Range. Stands with Douglas-fir trees over l years old are occasionally encountered, however (Hemstrom and Franklin ).

Senescence may. Douglas-fir or mixed conifers where Douglas-fir is a significant component. These results stem from a study undertaken as part of the lSummerfield, Edward.

Site index and height growth of Douglas­ fir and ponderosa pine in eastern. Washington. Washington State Depart­ ment of. Because of its slow early height growth, associated species such as western hemlock, Douglas-fir, and noble fir initially overtop Pacific silver fir when grown in the open.

After the initial overtopping, on many sites Pacific silver fir appears to outgrow and become taller than western hemlock after years (19). On cool, moist sites at the. S.A Acker, T.E Sabin, L.M Ganio, W.A McKeeDevelopment of old-growth structure and timber volume growth trends in maturing Douglas-fir stands For.

Growth release on residual mature trees has been modest, but release in thinned second-growth stands has been substantial. The cutting program coupled with fire suppression over the past 70 years has favored regeneration of Douglas-fir over ponderosa pine on much of the area.

Because no local Douglas-fir stocking or yield table was avail- able, we used yield tables for second-growth western white pine (Haig ), which occurred in parts of the study area. We referred to Deitschman and Green () to relate heights of dominant Douglas- firs to white pine site index, from which we deter- mined normal stocking.

Release improved growth of survivors in 4-year-old salmonberry by 51% in height, 72% in diameter, and % in volume at age Sitka spruce grew well until damaged by insects. Hemlock growth was equal to or greater than that of Douglas-fir of comparable initial height.

Abies grandis (Dougl. ex D. Don) Lindl. Grand Fir. Pinaceae -- Pine family. Marvin W. Foiles, Russel T. Graham, and David F. Olson, Jr. Grand fir (Abies grandis), also called lowland white fir, balsam fir, or yellow fir, is a rapid-growing tree that reaches its largest size in the rain forest of the Olympic Peninsula of tree in that area measures cm ( in) in d.b.h., Changes in tree growth rates can affect tree mortality and forest feedbacks to the global carbon cycle.

As air temperature increases, evaporative demand also increases, increasing effective drought in forest ecosystems. Using a spatially comprehensive network of Douglas-fir (Pseudotsuga menziesii) chronologies from locations that experience distinctly different climate in the western.

The interior Douglas-fir zone occurs at low elevation; many of differences in age at infection confound growth reduction with tree the readily accessible Douglas-fir stands have been cut selectively size.

Therefore, we used a measure of relative tree growth rate on one or more occasions. In the context of questioning the relevance of making Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) silviculture more dynamic in Wallonia, we evaluated the influence of growth rate on the potential of Douglas-fir lumber for structural uses.

Therefore, six trees to cm in circumference at m were felled in 11 stands whose age varied from 40 to 69 years (mean circumference of the. Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) before planting, can modify indoleacetic acid (IAA) levels in roots, root growth responses, and tree survival.

We treated two different 1+0 stock types (PSBB and PSB) of Douglas-fir with indole-butyric acid (IBA), ethephon (Ethrel®), alginate, or a combination of IBA and alginate. New. We apply a combination of suppression and release criteria to reconstruct the disturbance history of a ponderosa pine – Douglas-fir stand in central Idaho.

In this stand, disturbance, likely fire, induced growth releases in some trees, and sudden, severe suppressions in others. To characterize growth release following disturbance, we developed boundary-line release criteria for Douglas-fir.Relative growth rates of two-year-old Douglas-fir were depressed for a year or two after planting, but then remained relatively constant, or increased during the ensuing 5 years.

Relative growth rates of smaller seedlings were greater than those of larger seedlings so that relative biomass differences decreased with time, and the time advantage.Predicted height:diameter ratio of Douglas-fir seedlings increased as IBA increased. Under regeneration methods that retain a portion of the overstory, a residual overstory with basal area growth, and continued survival of Douglas-fir .