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[Clarifying the factors affecting Larix gmelinii forest regeneration based on structural equation model]
Ling-Bo Dong1, Dong-Yuan Tian1, Ying Chen1
1Ministry of Education Key Laboratory of Sustainable Forest Ecosystem Management, School of Forestry, Northeast Forestry University, Harbin 150040, China.
Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|October 19, 2021
Summary
Sustainable forest management for Larix gmelinii relies on understanding regeneration drivers. Key factors include soil pH, potassium, species diversity, and stand structure, guiding effective thinning and replanting strategies.
Area of Science:
- Forest Ecology
- Silviculture
- Quantitative Ecology
Background:
- Natural regeneration is crucial for Larix gmelinii forest sustainability.
- Understanding the complex interplay of factors influencing regeneration is vital for effective forest management.
Purpose of the Study:
- To identify critical and controllable factors influencing natural regeneration density and diversity in Larix gmelinii forests.
- To construct a structural equation model to quantify these influences.
Main Methods:
- Utilized 37 variables across stand structure, species diversity, soil, and site conditions.
- Employed structural equation modeling (SEM) to analyze data from 49 Larix gmelinii forest plots.
- Quantified direct, indirect, and total influence coefficients for each path.
Main Results:
- Stand non-spatial structure had the strongest negative effect on regeneration density, while species diversity had a positive effect.
- Soil condition and site condition were the most influential factors for regeneration diversity.
- Identified soil pH, total potassium, species diversity, tree height diversity, uniform angle index, and stand volume per hectare as key controllable factors.
Conclusions:
- Thinning treatments and introducing broadleaved trees can optimize species composition and diversity.
- Adjusting soil pH and nutrient levels promotes natural regeneration.
- These findings support sustainable management practices for Larix gmelinii forests.
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