scholarly journals The effects of timing of pre-commercial thinning and stand density on stem form and branch characteristics of Pinus sylvestris

2007 ◽  
Vol 80 (3) ◽  
pp. 323-335 ◽  
Author(s):  
K. A. Ulvcrona ◽  
S. Claesson ◽  
K. Sahlen ◽  
T. Lundmark
Keyword(s):  
Pinus Sylvestris ◽  
Stand Density ◽  
Stem Form ◽  
Commercial Thinning

scholarly journals Developing Optimal Commercial Thinning Prescriptions: A New Graphical Approach

2005 ◽  
Vol 22 (3) ◽  
pp. 170-174
Author(s):  
KaDonna C. Randolph ◽  
Robert S. Seymour ◽  
Robert G. Wagner
Keyword(s):  
Net Present Value ◽  
Biological Response ◽  
Stand Density ◽  
Annual Increment ◽  
Management Objectives ◽  
Commercial Thinning ◽  
Stand Density Management ◽  
Growth Simulator ◽  
Arcview Gis ◽  
Final Harvest

Abstract We describe an alternative approach to the traditional stand-density management diagrams and stocking guides for determining optimum commercial thinning prescriptions. Predictions from a stand-growth simulator are incorporated into multiple nomograms that graphically display postthinning responses of various financial and biological response variables (mean annual increment, piece size, final harvest cost, total wood cost, and net present value). A customized ArcView GIS computer interface (ThinME) displays multiple nomograms and serves as a tool for forest managers to balance a variety of competing objectives when developing commercial thinning prescriptions. ThinME provides a means to evaluate simultaneously three key questions about commercial thinning: (1) When should thinning occur? (2) How much should be removed? and (3) When should the final harvest occur, to satisfy a given set of management objectives? North. J. Appl. For. 22(3):170 –174.

Early Survival and Growth of Russian Pinus sylvestris L. in Canada

1970 ◽  
Vol 46 (4) ◽  
pp. 325-328
Author(s):  
A. H. Teich ◽  
M. J. Holst
Keyword(s):  
Pinus Sylvestris ◽  
Scots Pine ◽  
High Performance ◽  
Jack Pine ◽  
Stem Form ◽  
Growth And Survival ◽  
Growing Seasons ◽  
Survival And Growth ◽  
Continental Climate ◽  
Better Than

Scots pine provenances from Russia were grown in Ontario at Longlac, Dorset and Chalk River, and in Saskatchewan at Prince Albert and Indian Head. After eight growing seasons in the field all provenances survived well. The three tallest, Orel, Woronesh and Kiev provenances, grew considerably taller than the others, and at Prince Albert, where native jack pine was also grown, the growth and survival of these provenances was also better than that of jack pine. If further studies show that this high performance persists and that stem form is commercially acceptable, seedlings from these three provenances may be useful for reforestation in those parts of Canada with a continental climate.

scholarly journals Distribution and occurrence of western gall rust in thinned jack pine stands

1994 ◽  
Vol 70 (6) ◽  
pp. 788-794 ◽  
Author(s):  
S. C. Hills ◽  
D. M. Morris ◽  
C. Bowling
Keyword(s):  
Infection Rate ◽  
Pinus Banksiana ◽  
Stand Density ◽  
Jack Pine ◽  
Pissodes Strobi ◽  
Northwestern Ontario ◽  
Commercial Thinning ◽  
Endocronartium Harknessii ◽  
Commercial Species ◽  
Stem Gall

Jack pine (Pinus banksiana Lamb.) is one of the most important commercial species in northwestern Ontario and is the principal host of one of the most serious stem rusts, western gall rust (WGR) caused by Endocronartium harknessii (J.P. Moore) Y. Hirat. In 1986 a trial was established to determine, in part, effects of precommercial thinning on the distribution and occurrence of WGR in jack pine. A 9 year-old aerially seeded jack pine stand was thinned to square spacings of 1 m, 1.5 m, 2 m, 2.5 m, 3 m and a control. Fifth-year results indicated that a significant quadratic trend (p = 0.014) existed between spacing and stem gall infection rate. The incidence of WGR (stem galls) increased as stand density decreased to a maximum at 1.5 m spacing, and then declined to roughly the infection rate of the control at the lowest density (3 m). A significant relationship (0.084) between crown class and the rate of branch gall infection rate was also detected. The branch gall infection rate decreased from 6.2% year−1 for dominant trees to 2.8% year−1 for trees categorized as suppressed. Based on these results, pre-commercial thinning operations should target those trees with main stem galls and/or numerous branch galls, regardless of size and crown position, and then focus on the removal of suppressed trees to meet the desired density target. This strategy should not only enhance growth of the remaining trees, but also reduce WGR inoculum levels and reduce future WGR-related mortality. Key words: jack pine (Pinus banksiana Lamb.), western gall rust (Endocronartium harknessii (J.R Moore) Y. Hirat.), pre-commercial thinning, white pine weevil (Pissodes strobi Peck.)

scholarly journals Evaluating harvest costs and profit of commercial thinnings in softwood stands in west-central Maine: A case study

2015 ◽  
Vol 91 (02) ◽  
pp. 150-160 ◽  
Author(s):  
Patrick Hiesl ◽  
Jeffrey G. Benjamin ◽  
Brian E. Roth
Keyword(s):  
Block Design ◽  
Unit Cost ◽  
Small Diameter ◽  
Wood Chip ◽  
Basal Area ◽  
Stand Density ◽  
Cost Comparison ◽  
Positive Effects ◽  
Commercial Thinning ◽  
West Central

Precommercial thinning (PCT) is a common silvicultural treatment in the management of young conifer forests. The positive effects of PCT on tree growth are well documented, however, there have been few operational studies of thinning productivity associated with later harvests in such stands and associated cost comparison with high-density, small-diameter stands. In the winters of 2012/2013 and 2013/2014 a long-term herbicide and PCT study in west-central Maine was commercially thinned using cut-to-length (CTL) and whole-tree (WT) harvesting systems in PCT and non-PCT stands, respectively. Thinning prescriptions consisted of three nominal removal intensities (33%, 50%, and 66% of the standing softwood volume) in a randomized block design with three to four replications. Stand density, basal area, hardwood content, and removal intensity were not significant in explaining variation in harvester and feller-buncher productivity. An analysis of unit cost of production indicated that wood chip production using a WT system in non-PCT stands is less costly than the production of roundwood using a CTL system in PCT stands. Profit, however, is similar for products harvested by either system. Our conclusion is that the WT system used in the study is economically feasible to treat highdensity, small-diameter stands in a commercial thinning.

scholarly journals INFLUENCE OF FOREST STAND DENSITY ON PINUS SYLVESTRIS ROUNDWOOD QUALITY IN EVEN-AGED MIXED SCOTS PINE STANDS IN MYRTILLOSA MEL. MESOTROPHIC SITE TYPE

2021 ◽  
Vol 3 ◽  
pp. 208-215
Author(s):  
Ziedonis Miklašēvičs
Keyword(s):  
Pinus Sylvestris ◽  
Tree Species ◽  
Prediction Models ◽  
Wood Quality ◽  
Research Work ◽  
Stand Density ◽  
Forest Stand ◽  
Raw Material ◽  
Quality Characteristic ◽  
Round Wood

Among different development directions for better forest utilization, the purposefully detailed assessment of wood quality as raw material, faciliating improved wood utilization in manufacturing of traditional roundwood products as well as brand new products, proves to be very perspective. Roundwood quality features substantially differ depending on forest stand geographic location, growing site conditions, tending of forest stands and other circumstances [2], [3], [11]. Therefore, the economical estimation of more important tree species in Latvia should not be based only on scientific conclusions made in other countries, so particular research is needed for this purpose. Pine (Pinus sylvestris) is the most widespread tree species in Latvia, therefore a research work provided the characteristic of round wood obtained from pine tree stem is an actual point from several aspects, as it is necessary;to create early prediction models of roundwood quality; to plan harvesting purposes;to create the data basis of economically more relevant domestic tree species;to provide the further development of roundwood quality assessment methods;to estimate the competitiveness of Latvia pine timber in the world marketThe main goal of study is to work out the quality characteristic of pine roundwood manufactured in final felling sites depending on timber formation damages- bark abrasion caused side drought.  

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