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Related Concept Videos

Adaptations that Reduce Water Loss01:57

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
Xylem and Transpiration-driven Transport of Resources02:03

Xylem 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.
Responses to Drought and Flooding02:41

Responses to Drought and Flooding

Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
Water and Mineral Acquisition02:34

Water and Mineral Acquisition

Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
Survival Tree01:19

Survival Tree

Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
 Building a Survival Tree
Constructing a survival tree begins...
Regulation of Transpiration by Stomata02:04

Regulation of Transpiration by Stomata

During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.

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Related Experiment Video

Updated: Jul 10, 2026

The Calibration and Use of Capacitance Sensors to Monitor Stem Water Content in Trees
08:31

The Calibration and Use of Capacitance Sensors to Monitor Stem Water Content in Trees

Published on: December 27, 2017

Linking leaf and tree water use with an individual-tree model.

Belinda E Medlyn1, David A Pepper, Anthony P O'Grady

  • 1School of Biological, Earth and Environmental Sciences, University of NSW, Sydney 2052, Australia. bmedlyn@bio.mq.edu.au

Tree Physiology
|October 17, 2007
PubMed
Summary

This study demonstrates that models can accurately scale leaf gas exchange to whole-tree transpiration in Eucalyptus forests. The MAESTRA model successfully linked leaf-level measurements with sap flow data, confirming its predictive capabilities.

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Last Updated: Jul 10, 2026

The Calibration and Use of Capacitance Sensors to Monitor Stem Water Content in Trees
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Published on: December 27, 2017

Development of an Individual-Tree Basal Area Increment Model using a Linear Mixed-Effects Approach
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Published on: July 3, 2020

Relating Stomatal Conductance to Leaf Functional Traits
11:09

Relating Stomatal Conductance to Leaf Functional Traits

Published on: October 12, 2015

Area of Science:

  • Forest Ecology
  • Plant Physiology
  • Ecosystem Modeling

Background:

  • Scaling physiological processes from leaf to whole-tree is crucial for understanding forest dynamics.
  • Accurate estimation of forest transpiration is vital for water resource management and climate change studies.

Purpose of the Study:

  • To test the efficacy of an individual-tree-based model (MAESTRA) in scaling leaf gas exchange to whole-tree transpiration.
  • To validate model predictions against field measurements of sap flow in a Eucalyptus forest.

Main Methods:

  • Leaf gas exchange and sap flow were measured on 10 Eucalyptus delegatensis trees.
  • The MAESTRA model was parameterized with leaf-level physiological data and detailed canopy structure information.
  • Model-simulated transpiration was compared with measured sap flow data.

Main Results:

  • The MAESTRA model accurately replicated the temporal patterns of tree transpiration.
  • Leaf gas exchange parameters were generally consistent across trees, with some exceptions possibly due to water stress.
  • Model performance showed a slight lag in the morning, attributed to water storage in stems.

Conclusions:

  • The study confirms the capability of models to estimate forest canopy transpiration from leaf-level measurements.
  • MAESTRA provides a robust framework for scaling physiological processes in forest ecosystems.
  • Understanding tree-to-tree variation in water use is important for refining ecosystem models.