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Related Concept Videos

Wood Products01:21

Wood Products

79
Wood products encompass a broad range of materials crafted from wood strands, veneers, lumber, and even waste wood-like shreds, designed for both structural and nonstructural purposes. Various specialized wood products have been developed to enhance strength, durability, and versatility in building applications.
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
79
Introduction to Wood01:19

Introduction to Wood

208
Wood, derived from trees, is a versatile and widely used construction material. Trees feature a trunk surrounded by a protective layer of dead bark. Beneath this outer layer lies the living bark, followed by the cambium, and then the sapwood which transitions into heartwood as it matures. At the center of the trunk is the pith. The age of a tree can be discerned by examining its growth rings, which are concentric bands visible in the trunk's cross-section.
The structural integrity of the...
208
Softwoods and Hardwoods01:28

Softwoods and Hardwoods

144
Softwoods and hardwoods, derived from different types of trees, are distinguished by their leaf structures and cellular compositions, each serving unique purposes in construction and manufacturing. Softwoods come from cone-bearing trees with needle-like leaves and are predominantly composed of longitudinal cells called tracheids and a smaller proportion of radial cells known as rays. Due to their cellular structure, softwoods are commonly used in construction for structural frames, sheathing,...
144
Lumber01:19

Lumber

108
Lumber is derived from logs which are harvested, debarked, and processed into long pieces with a rectangular cross-section. The transformation of logs into lumber involves multiple steps, beginning with an automated saw that slices the log into slabs. These slabs are then transported via a conveyor belt to smaller saws, where they are cut into square-edged pieces of specific widths.
Initially, the surfaces of these lumber pieces are rough, and their dimensions may vary slightly from one end to...
108
Structural Properties and Dimensions of Lumber01:21

Structural Properties and Dimensions of Lumber

80
Wood's structural properties derive from fibers aligned along the tree's length, contributing significantly to its mechanical strength. Wood exhibits up to twenty times greater tensile strength along these fibers compared to across them, and generally shows better performance under compression than tension. The length of fibers varies, with hardwoods having fibers around one twenty-fifth inch long and softwoods ranging from one-eighth to one-third inch.
The strength characteristics of...
80
Meristems and Plant Growth02:36

Meristems and Plant Growth

44.5K
Plants grow throughout their lives; this is called indeterminate growth, and it distinguishes plants from most animals. Although certain parts of plants stop growing (e.g., leaves and flowers), others grow continuously—like roots and stems.
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Related Experiment Video

Updated: Jun 6, 2025

Development of an Individual-Tree Basal Area Increment Model using a Linear Mixed-Effects Approach
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Global planted forest data for timber species.

Sarah B Richardson1, Lauralee An2, Sarah E Pollack3,4

  • 1World Resources Institute, Washington, DC, 20002, USA. richardson.sarahbaker@gmail.com.

Scientific Data
|November 23, 2024
PubMed
Summary
This summary is machine-generated.

Distinguishing timber origins (natural vs. planted forests) is crucial for legal wood trade. This study introduces Planted Forest Timber Data, a comprehensive global dataset to aid this distinction.

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Area of Science:

  • Forestry Science
  • Environmental Science
  • Conservation Biology

Background:

  • Global timber trade relies on distinguishing wood origin to ensure legality.
  • Scarcity of species-level global planted forest data hinders accurate timber tracking.
  • Differentiating timber from natural versus planted forests is key for regulatory compliance and biodiversity protection.

Purpose of the Study:

  • To develop a comprehensive, species-level global dataset of planted forests.
  • To provide crucial data for verifying the legality of timber products in the global market.
  • To support forest governance, policy, enforcement, and research in promoting sustainable timber trade.

Main Methods:

  • Developed a two-pronged dataset: 'polygon' and 'non-polygon' location-based data, named Planted Forest Timber Data.
  • Extracted polygon data from the World Resources Institute's Spatial Database of Planted Trees v2.0 for traded timber species.
  • Compiled non-polygon data from peer-reviewed literature and government documents.

Main Results:

  • The polygon dataset covers 27 countries and 253 species.
  • The non-polygon dataset includes 91 countries and 447 species.
  • The combined dataset offers extensive global coverage for planted timber species.

Conclusions:

  • The Planted Forest Timber Data provides vetted information to support legal timber trade verification.
  • The living datasets are designed for mutual growth and cross-validation, enhancing data reliability.
  • This resource aims to empower global leaders in forest governance to combat illegal logging and protect biodiversity.