Certification and Tropical Timber Supply

Author(s):  
Karl Ludwig Brockmann ◽  
Jens Hemmelskamp ◽  
Olav Hohmeyer
Forests ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 245
Author(s):  
Nguyen Dang Cuong ◽  
Köhl Michael ◽  
Mues Volker

Forest landscape restoration is a widely accepted approach to sustainable forest management. In addition to revitalizing degraded sites, forest landscape restoration can increase the supply of sustainable timber and thereby reduce logging in natural forests. The current study presents a spatial land use optimization model and utilizes a linear programming algorithm that integrates timber production and timber processing chains to meet timber demand trade-offs and timber supply. The objective is to maximize yield and profit from forest plantations under volatile timber demands. The model was parameterized for a case study in Thai Nguyen Province, Vietnam, where most forest plantations grow Acacia mangium (A. mangium). Data were obtained from field surveys on tree growth, as well as from questionnaires to collect social-economic information and determine the timber demand of local wood processing mills. The integration of land use and wood utilization approaches reduces the amount of land needed to maintain a sustainable timber supply and simultaneously leads to higher yields and profits from forest plantations. This forest management solution combines economic and timber yield aspects and promotes measures focused on economic sustainability and land resource efficiency.


2005 ◽  
Vol 7 (4) ◽  
pp. 332-341 ◽  
Author(s):  
J Wells ◽  
D Wall
Keyword(s):  

2021 ◽  
Vol 131 ◽  
pp. 341-349
Author(s):  
F. Sessa ◽  
K.F. Veeyee ◽  
P. Canu

Heredity ◽  
2014 ◽  
Vol 113 (1) ◽  
pp. 74-85 ◽  
Author(s):  
K Daïnou ◽  
G Mahy ◽  
J Duminil ◽  
C W Dick ◽  
J-L Doucet ◽  
...  

2014 ◽  
Vol 39 ◽  
pp. 32-42 ◽  
Author(s):  
Fabian Härtl ◽  
Thomas Knoke
Keyword(s):  

2008 ◽  
Vol 5 (1) ◽  
pp. 1 ◽  
Author(s):  
Rohana Hassan ◽  
Azmi Ibrahim ◽  
Zakiah Ahmad

Mortise and tenon are commonly used as timber connections between beam and column with enhancement by pultruded dowel. At present the data on the performance of mortise and tenon joints manufactured using Malaysian tropical timber is not available. Therefore there is a need to provide such data for better guidance and references in design purposes. This study investigates the behavior and strength properties of dowelled mortise and tenon timber connections using selected Malaysian tropical timber with different types of dowels namely steel and timber. Bending tests were performed on mortise and tenon beam-column joints of Kempas when plugged with steel or wood dowel. It is found that pegging the connections with the respective steel and timber dowels resulted in a bending load capacity of 6.09 and 5.32 kN, taken as the average of three samples, the latter being 12 % lower than former. Visual observation of the failed test pieces revealed steel dowels exhibiting yield mode Im and wood, mode IIIs. The wood dowels yielded in bending at one plastic hinge point per shear plane with an associated wood crushing while the steel dowels remained practically undeformed with an associated crushing of the main member.


Author(s):  
Sebastian Nemestothy ◽  
Michael Grabner

Abstract Wood in Austria has been an indispensable source of energy, but also, a crucial building material. In the field of dendroarchaeology the timeline between raw material harvest and finalisation of a wooden construction is a crucial piece of puzzle in understanding building history. This paper aims to provide an overview on historical timber supply in Austria by examining the felling and debarking methods, as recorded in old literature and, from the visible evidence on beams in wooden constructions. Historically, depending on the size and location of a building, a small or extended supply chain of timber was required. These generally consisted of logs travelling via streams and rivers, and possibly beforehand passing through sluices and log slides, being skidded by horses and oxen, and being moved by manpower on sleighs, or simply on the forest floor. The seasonal working steps of the logging process included felling, debranching, debarking, cutting to length, and the start of the transportation process. Debarking was a specific focus in this investigation, as the appearance of bast (the inner bark of trees from which ropes were made) or even bark residues on the waney edge (outermost growth ring underneath the bark), may provide a clue to the felling time of year. These indications of the cutting season have been noticed during dendrochronological sampling of beams in historical buildings. Improved knowledge of them may contribute to future research of these buildings.


2013 ◽  
Vol 41 (2) ◽  
pp. 141 ◽  
Author(s):  
M Thilina R Fernando ◽  
KMG Gehan Jayasuriya ◽  
Jeffrey L Walck ◽  
ASTB Wijetunga

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