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Related Experiment Video

Updated: May 20, 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

How to Define Spacing Among Forest Trees to Mitigate Competition: A Technical Note.

Khodabakhsh Zabihi¹, Vivek Vikram Singh¹, Aleksei Trubin¹

¹Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Kamýcká 129, Praha-Suchdol, 165 00 Prague, Czech Republic.

|March 26, 2025

Summary

Optimizing Norway spruce forest density is key for drought resilience. A novel variogram method using sap flow residuals identifies ideal tree spacing (5.12-5.60 m) to reduce competition and enhance water resource management.

Keywords:

Norway spruce (Picea abies)ecophysiology forest thinning sap flow silviculture practices tree density tree plantation distancing

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Last Updated: May 20, 2025

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Area of Science:

Forestry science
Ecology
Hydrology

Background:

Forest stand density critically influences tree competition for resources, particularly water, impacting overall forest health and resilience.
Optimizing inter-tree spacing is essential for mitigating drought effects and managing forest ecosystems effectively.
Previous methods for determining optimal spacing lack precision in accounting for complex environmental variables.

Purpose of the Study:

To develop and validate a novel technique for determining optimal tree spacing in Norway spruce forests to reduce inter-species competition.
To quantify the relationship between tree density, sap flow, and inter-tree spacing under temperate conditions.
To provide a practical tool for forest managers to guide thinning and planting strategies for enhanced drought resilience.

Main Methods:

Utilized xylem sap flow residuals from an ordinary least square (OLS) regression model to isolate the effects of tree density.
Filtered sap flow data for 101 Norway spruce trees (DBH 40 ± 5 cm) using 12 consecutive daily measurements at the start of the growing season.
Employed an experimental variogram to quantify sap flow variability in relation to varying tree spacing.

Main Results:

Identified steady sap flow patterns at densities of 10-12 trees per 314 m² (350 ± 32 trees/ha), corresponding to inter-tree spacings of 5.12 m, 5.34 m, and 5.60 m.
Demonstrated that sap flow variability is significantly influenced by tree density and spacing.
The developed model residuals effectively accounted for tree density as a primary driver of sap flow variability.

Conclusions:

The novel variogram technique using sap flow residuals provides a robust method for determining optimal tree spacing to minimize competition.
Optimal spacing (5.12-5.60 m) enhances forest resilience to drought by balancing resource availability and tree density.
This technique offers a practical, adaptable tool for forest management, aiding in sustainable thinning and planting decisions.