Influence of Thinning Operations on the Hydrology of a Drained Coastal Plantation Watershed

2003 ◽  
Author(s):  
J. McFero Grace III ◽  
R.W. Skaggs ◽  
H.R. Malcom ◽  
G.M. Chescheir ◽  
D.K. Cassel
Keyword(s):  
Thinning Operations ◽  
Coastal Plantation

scholarly journals Impact of Distance between Strip Roads on Productivity and Costs of a Forwarder in Commercial Thinning of Pinus Taeda Stands

2020 ◽  
Vol 41 (2) ◽  
pp. 243-249
Author(s):  
Oscar Manuel de Jesús Vera Cabral ◽  
Eduardo da Silva Lopes ◽  
Carla Krulikowski Rodrigues ◽  
Afonso Figueiredo Filho
Keyword(s):  
Pinus Taeda ◽  
Value Added ◽  
Wood Products ◽  
Production Costs ◽  
Working Cycle ◽  
Time Motion ◽  
Commercial Thinning ◽  
Selective Harvest ◽  
Thinning Operations ◽  
The Impact

Demand for higher value-added wood products stimulates research for new, mainly mechanized, thinning operations in order to increase productivity and reduce production costs. In this context, the aim of this study was to evaluate the impact of distance between strip roads on forwarder productivity and costs of thinning operations in Pinus taeda stands. The study was carried out in 10-year-old Pinus taeda stands located in Parana State, Brazil. Two thinning methods were evaluated: (1) TH5: systematic harvest in every fifth tree row and selective harvest in adjacent rows; and (2) TH7: systematic harvest in every seventh tree row and selective harvest in adjacent rows. Working cycle times, productivity and costs were determined through a time-motion study of the forwarder. The additional variables evaluated were wood assortments (industrial wood and energy wood) and extraction distances (50, 100, 150 and 200 m), and mean values were compared between thinning methods using t tests for independent samples (α=0.05). Loading and unloading elements consumed the most time in the working cycle, with lower participation time in TH7 due to greater availability of logs along the strip roads (higher pile volumes), influencing total cycle time up to the mean distance of 150 m for both assortments. TH7 consequently showed 6% higher productivity, its energy yield was 5.3% lower and its production cost was 3.0% lower.

scholarly journals Fire prevention with thinning operations in black pine reforestations. Results of a study on a regional scale

2015 ◽  
pp. 7-21 ◽  
Author(s):  
Antonino Nicolaci ◽  
Pasquale Antonio Marziliano ◽  
Franco Pignataro ◽  
Giuliano Menguzzato ◽  
Francesco Iovino
Keyword(s):  
Regional Scale ◽  
Fire Prevention ◽  
Black Pine ◽  
Thinning Operations

Production Proven, High Precision Temporary Bond/De-bond Process

2013 ◽  
Vol 2013 (1) ◽  
pp. 000861-000865 ◽  
Author(s):  
Blake Dronen ◽  
Aric Shorey ◽  
B.K. Wang ◽  
Leon Tsai
Keyword(s):  
High Precision ◽  
Support System ◽  
Thickness Variation ◽  
Total Thickness ◽  
Critical Step ◽  
Low Coherence ◽  
Total Thickness Variation ◽  
Thinning Operations ◽  
Wafer Thinning

Wafer thinning represents a critical step in 2.5D and 3D-IC integration. Achieving low total thickness variation (TTV) of a bonded stack is essential since it directly impacts the TTV of the thinned device wafer. It is essential to understand and utilize appropriate processes and materials that provide precision bonded stacks prior to thinning operations in order to achieve high process yields. The 3M™ Wafer Support System and Corning's precision glass carrier wafers were used to produce bonded stacks. Leveraging metrology tools like the Flatmaster MSP-300 and low coherence interferometric probes allow for characterization of the TTV of each layer of a bonded stack and better understanding of the stack-up as well as how to minimize stack TTV. The ability to deliver stack TTV of < 2 um in a repeatable manner has been demonstrated.

Characterizing Canopy Fuels to Predict Fire Behavior in Pitch Pine Stands

2007 ◽  
Vol 24 (1) ◽  
pp. 65-70 ◽  
Author(s):  
Matthew J. Duveneck ◽  
William A. Patterson
Keyword(s):  
Fire Behavior ◽  
Small Diameter ◽  
Basal Area ◽  
Regression Equations ◽  
Crown Fire ◽  
Pinus Rigida ◽  
Canopy Fuels ◽  
Pitch Pine ◽  
Thinning Operations ◽  
Pine Stands

Abstract Destructive sampling of 31 pitch pine (Pinus rigida P. Mill) trees ranging in dbh from 2.7 to 42.5 cm and in height from 4.1 to 23.8 m provided a complete inventory of needles and small-diameter branch weights used to characterize canopy fuels to predict fire behavior in pitch pine stands. Regression equations using dbh as an independent variable predict canopy bulk density with an r2 > 0.93. The results provide managers with a method of evaluating the effectiveness of thinning operations in reducing crown fire potential in well-stocked stands. To demonstrate the application of the method, we calculated the wind speed (Crowning Index [CI]) needed to sustain an active crown fire in thinned and unthinned pitch pine stands in Montague, Massachusetts. Thinning to 2.8 m2/ha basal area increased the CI from 34 to 98 km/hour.

Performance of Small Grapple Skidders in Plantation Thinning Applications

1988 ◽  
Vol 12 (4) ◽  
pp. 243-246 ◽  
Author(s):  
W. Dale Greene ◽  
Bryce J. Stokes
Keyword(s):  
Coastal Plain ◽  
Production Cost ◽  
Atlantic Coastal Plain ◽  
Total Production ◽  
Thinning Operations ◽  
Insurance Rates ◽  
Atlantic Coastal

Abstract Small grapple skidders working on two thinning operations in the Atlantic coastal plain were examined. When gate delimbing was used, production per PMH was reduced from 11.47 cords to 7 85 cords—a reduction of 32%. This reduction in skidder productivity was compensated by a reduction in total production cost per cord because of the high cost of manually delimbing trees. With increases in insurance rates for labor-intensive operations continuing to rise dramatically, gate delimbing systems should continue to be competitive. South., J. Appl. For. 12(4):243-246.

scholarly journals Effect of Day or Night and Cumulative Shift Time on the Frequency of Tree Damage during CTL Harvesting in Various Stand Conditions

Forests ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 743 ◽  
Author(s):  
Mariusz Bembenek ◽  
Petros A. Tsioras ◽  
Zbigniew Karaszewski ◽  
Bogna Zawieja ◽  
Ewa Bakinowska ◽  
...  
Keyword(s):  
Forest Management ◽  
Human Factor ◽  
Stand Density ◽  
Age Classes ◽  
Tree Damage ◽  
Thinning Intensity ◽  
Thinning Operations ◽  
Work Shifts ◽  
Pine Stands ◽  
Stand Conditions

Thinning is one of the most important tools of forest management, although thinning operations require the use of machines which ultimately cause damage to the remaining stand. The level of damage largely depends on the human factor, and a tired, less focused operator will create more injuries in the forest. With this in mind, the objectives of this research were to find out whether the probability of tree damage caused by an operator is also affected by: (1) the part of the day (dawn/day/dusk/night), and (2) the cumulative shift time. The research was carried out in pure pine stands of different ages, density and thinning intensities. Sample plots were selected that had an increasing number of trees per hectare and growing thinning intensities were applied. The same Komatsu 931.1 harvester was used for the thinning operations in each stand. In all the age classes combined, 5.41% of the remaining trees were wounded. There was a significant influence of the part of the day on the percentage of damaged trees, which was positively correlated with the cumulative shift time. Stand conditions, such as age class and stand density, as well as thinning characteristics—thinning intensity, number of harvested trees and productivity—have different effects on the distribution of damage intensity and on probability. The results may improve the planning of operators’ work shifts in forests of various ages and densities, allowing harvester productivity to be maintained while at the same time inflicting the lowest possible level of damage.

scholarly journals Length accuracy of logs from birch and aspen harvested in thinning operations

2015 ◽  
Vol 39 ◽  
pp. 845-850 ◽  
Author(s):  
Mariusz BEMBENEK ◽  
Piotr S. MEDERSKI ◽  
Zbigniew KARASZEWSKI ◽  
Agnieszka ŁACKA ◽  
Witold GRZYWIŃSKI ◽  
...  
Keyword(s):  
Thinning Operations

Felling and Skidding Costs Associated with Thinning a Commercial Appalachian Hardwood Stand in Northern West Virginia

1986 ◽  
Vol 3 (4) ◽  
pp. 159-163 ◽  
Author(s):  
Samuel M. Brock ◽  
Kenneth D. Jones ◽  
Gary W. Miller
Keyword(s):  
West Virginia ◽  
Study Data ◽  
Regression Equations ◽  
Production Rates ◽  
Cost Information ◽  
Treatment Data ◽  
Commercial Logging ◽  
Tree Length ◽  
Thinning Operations ◽  
Area North

Abstract Detailed cost information on thinning operations is needed to develop economic guidelines for managing immature central Appalachian hardwood stands. Three thinning treatments were applied in a 50-yr-old mixed-oak, cove hardwood stand in northern West Virginia. A commercial logging contractor using chain saws and a rubber-tired skidder conducted the logging operations. Time-study data were used to compute production rates for felling marked trees and skidding tree-length logs to roadside landings for each thinning treatment. Production rates ranged from 2.7 to 3.0 cunits/hr depending on the residual stocking treatment. The cost of merchantable material at roadside ranged from $10.79 to $11.99 per cunit. Regression equations for predicting felling and skidding times were developed for each treatment. Data from these equations can be used in estimating production rates and costs for similar thinning operations. A nomogram is provided for estimating felling and skidding costs for a 60% residual stocking treatment, the current recommended silvicultural prescription for stands similar to the study area. North. J. Appl. For. 3:159-163, Dec. 1986.

scholarly journals The Accessibility of Post-Fire Areas for Mechanized Thinning Operations

Forests ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 471
Author(s):  
Dariusz Kulak ◽  
Janusz M. Sowa ◽  
Grzegorz Szewczyk ◽  
Arkadiusz Stańczykiewicz
Keyword(s):  
Bearing Capacity ◽  
Forest Fire ◽  
Soil Compaction ◽  
Fire History ◽  
Timber Harvesting ◽  
Average Value ◽  
Penetrometer Resistance ◽  
History Of ◽  
Thinning Operations ◽  
And Control

In 1992, in Southern Poland, large areas of Silesian forests were affected by the country’s largest forest fire. Stands introduced in the 9000-ha post-fire region are currently undergoing early thinning. Due to the scope of these treatments, the chance for their timely implementation is ensured only by the application of cut-to-length (CTL) technologies, i.e., with the use of harvesters and forwarders. The use of CTL technologies may, however, be difficult due to the fire history of these stands, which could affect the bearing capacity of their soils. The objective of this study is to determine the accessibility of stands for forest machines in relation to the bearing capacity of the soils and changes in soil compaction in the post-fire sites. Soil compaction was measured in terms of penetrometer resistance in the stands introduced in the post-fire area in question, as well as in control stands growing on five different soil types. It was shown that in the topsoil layer—from 8 to 18 cm thick depending on the soil type—differences in soil compaction in the post-fire and control areas were relatively small. The impacts of the forest fire—manifested as a significant increase in the compaction of the forest soils—were still visible, but only in the deeper layers of the soil profile. In all of the compared pairs of forest compartments located in the stands regenerated after the fire, significantly higher values of cone indexes (CI) were found. The average value of this index in the post-fire stands was 2.15 MPa, while in the control stands it was 1.60 MPa, which indicates that in both groups of stands the bearing capacity of the soils should not limit the accessibility for vehicles used for timber harvesting and extraction.

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