Related Experiment Video
Updated: Jul 10, 2026
09:33
A Technical Perspective in Modern Tree-ring Research - How to Overcome Dendroecological and Wood Anatomical Challenges
Published on: March 5, 2015
Age-dependent xylogenesis in timberline conifers
Sergio Rossi1, Annie Deslauriers1, Tommaso Anfodillo1
1Treeline Ecology Research Unit, Dipartimento TeSAF, Università degli Studi di Padova, viale dell'Università 16, I-35020 Legnaro (PD), Italy.
The New Phytologist
|October 20, 2007
Summary
Older trees exhibit shorter cambial activity and wood formation periods, impacting their climate response. This age-related change in tree-ring production shortens the growing season for mature trees.
Area of Science:
- Dendrochronology
- Plant Physiology
- Forest Ecology
Background:
- Cambial activity and wood formation are crucial for tree growth and climate response.
- While no anatomical changes are seen in older trees, their differing climate sensitivity suggests age-related shifts in cambial patterns.
- Understanding these age-related changes is key to interpreting tree-ring data and climate interactions.
Purpose of the Study:
- To compare cambial activity and xylogenesis timing in adult versus old trees of three species.
- To investigate age-related changes in wood cell formation patterns.
- To determine if age affects tree responses to climate through altered growth periods.
Main Methods:
- Weekly monitoring of cambial activity, xylem cell enlargement, and wall thickening.
- Comparison between adult (50-80 yr) and old (200-350 yr) trees of Larix decidua, Pinus cembra, and Picea abies.
- Study conducted at the Alpine timberline over two years (2004-2005).
Main Results:
- Old trees showed 2-3 weeks shorter cambial activity compared to adult trees.
- Delayed onset of cambium division and reduced cell production in older trees.
- Overall xylem differentiation duration was reduced by 15-20% in old trees.
Conclusions:
- Cambial dynamics change significantly with tree age, shortening the tree-ring production window.
- Age-dependent variations in xylem growth periods likely influence how trees respond to climate.
- Shorter xylogenesis in older Alpine trees may be linked to size effects rather than age alone.
Related Concept Videos
02:36Meristems and Plant Growth
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.
01:28Softwoods and Hardwoods
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,...
01:19Introduction to Wood
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 wood...
The structural integrity of the wood...
03:02Primary and Secondary Growth in Roots and Shoots
Vascular plants, which account for over 90% of the Earth’s vegetation, all undergo primary growth—which lengthens roots and shoots. Many land plants, notably woody plants, also undergo secondary growth—which thickens roots and shoots.
02:03Xylem and Transpiration-driven Transport of Resources
The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.
01:09Changes in the Appendicular Skeleton with Age
The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...