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Related Concept Videos

Keystone Species01:39

Keystone Species

Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a pivotal role in the...
Trophic Efficiency00:46

Trophic Efficiency

Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
Meristems and Plant Growth02:36

Meristems 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.
Ecological Succession02:17

Ecological Succession

Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
Trait Centrality01:21

Trait Centrality

Trait centrality refers to the degree to which a particular characteristic influences the overall impression of an individual. Some traits exert a disproportionately strong impact on perception, shaping how people interpret other attributes of a person. Solomon Asch first systematically studied this phenomenon in 1946.Asch’s Experiment on Trait CentralityAsch's seminal study demonstrated the centrality of certain traits through a controlled experiment. Participants were presented with a list of...
Primary Production01:06

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

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Related Experiment Video

Updated: May 25, 2026

Relating Stomatal Conductance to Leaf Functional Traits
11:09

Relating Stomatal Conductance to Leaf Functional Traits

Published on: October 12, 2015

Key canopy traits drive forest productivity.

Peter B Reich1

  • 1Department of Forest Resources, University of Minnesota, 1530 Cleveland Avenue North, St Paul, Minnesota 55108, USA. preich@umn.edu

Proceedings. Biological Sciences
|January 27, 2012
PubMed
Summary
This summary is machine-generated.

Forest productivity is determined by light harvesting (leaf area index, LAI) and carbon fixation (canopy nitrogen, %N). These traits explain over 75% of variation in forest net primary productivity, aiding ecosystem metabolism assessments.

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Development of an Individual-Tree Basal Area Increment Model using a Linear Mixed-Effects Approach
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Development of an Individual-Tree Basal Area Increment Model using a Linear Mixed-Effects Approach

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Last Updated: May 25, 2026

Relating Stomatal Conductance to Leaf Functional Traits
11:09

Relating Stomatal Conductance to Leaf Functional Traits

Published on: October 12, 2015

Development of an Individual-Tree Basal Area Increment Model using a Linear Mixed-Effects Approach
04:35

Development of an Individual-Tree Basal Area Increment Model using a Linear Mixed-Effects Approach

Published on: July 3, 2020

Area of Science:

  • Ecology
  • Forest Science
  • Ecosystem Metabolism

Background:

  • Understanding leaf-to-ecosystem scaling is crucial for assessing terrestrial ecosystem metabolism.
  • Studies linking carbon fluxes to multiple forest canopy traits are limited.

Purpose of the Study:

  • To quantify mechanistic links between forest carbon fluxes and canopy attributes.
  • To determine if canopy structure and chemistry scale from instantaneous physiology to annual carbon fluxes.

Main Methods:

  • Collected data from 128 cold temperate and boreal forests across a regional temperature gradient.
  • Related stand-scale productivity to leaf area index (LAI) and canopy nitrogen concentration (%N).

Main Results:

  • LAI and canopy %N together explained over 75% of the variation in above-ground net primary productivity.
  • These relationships held true when productivity was expressed per year or per day of the growing season.
  • Less than 10% of variance remained unexplained after accounting for growing season length and climate.

Conclusions:

  • Forest canopy structure (LAI) and chemistry (%N) are key determinants of stand-scale productivity.
  • Physiologically based scaling relations, using remotely sensed data, can be valuable for global ecosystem modeling.