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Related Experiment Video

Updated: Dec 27, 2025

A Simple Planting Technique for Re-establishing Trees Where Frequent Inundation Occurs

A Simple Planting Technique for Re-establishing Trees Where Frequent Inundation Occurs

Published on: January 26, 2018

Inexpensive throughfall exclusion experiment for single large trees.

Benjamin M Cranston¹, Breanna F Powers^2,3,4, Cate Macinnis-Ng^1,3

¹School of Biological Sciences The University of Auckland Private Bag 92019 Auckland Mail Center Auckland 1142 New Zealand.

Applications in Plant Sciences

|February 29, 2020

Summary

This summary is machine-generated.

A new, inexpensive throughfall exclusion (TFE) method effectively simulates drought for individual large trees in native forests. This method allows for precise measurement of tree physiological responses to drought, aiding in forest conservation efforts.

Keywords:

drought tolerance mature forest plant–water relations sap flow

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Area of Science:

Forest Ecology
Drought Physiology
Climate Change Impacts

Background:

Drought-induced tree mortality is a growing global concern, especially for large trees.
Existing drought-manipulation experiments often use large, costly plots unsuitable for certain forest types or large trees.

Purpose of the Study:

To develop and test a cost-effective throughfall exclusion (TFE) method for simulating drought in natural forests with large trees.
To assess the physiological responses of individual large trees to simulated drought conditions.

Main Methods:

A novel TFE method was designed and implemented in the Waitākere Range, New Zealand.
The method excluded throughfall from a 22.25 m² area around individual kauri (Agathis australis) trees.
Water (sap flow) and carbon (stem increment, litterfall) fluxes were measured to indicate drought effects.

Main Results:

The TFE method successfully reduced soil moisture around the targeted trees.
Droughted trees exhibited significantly reduced sap flow, indicating physiological stress.
Stem increment and litterfall data provided further carbon flux indicators.

Conclusions:

The developed TFE method is inexpensive, customizable, and suitable for large trees in native forests.
This technique allows for the assessment of individual tree physiological responses to drought, irrespective of stem size.
The method can be adapted for various forest types and species, enhancing drought impact studies.