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Published on: November 25, 2016
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Mapping of sites in forest stands
Sylvio Péllico Netto1, Flavio R Stefanello1, Allan L Pelissari1
1Departamento de Engenharia Florestal, Universidade Federal do Paraná, Curitiba, PR, Brasil.
Anais Da Academia Brasileira De Ciencias
|January 16, 2015
Summary
Stratifying forest inventory by site quality significantly reduces volumetric variance in Pinus elliottii stands. This approach improves accuracy compared to traditional methods, enhancing forest management practices.
Area of Science:
- Forestry
- Ecology
- Quantitative Science
Background:
- Forest companies commonly use total planting area for stratified random sampling in forest inventories.
- Existing methods may not fully account for site-specific variations impacting volumetric estimates.
Purpose of the Study:
- To classify and map Pinus elliottii stands within the Tres Barras National Forest, Brazil.
- To evaluate the effectiveness of site-specific stratification in forest inventory sampling.
Main Methods:
- A systematic cluster sampling method was applied within compartments.
- The Prodan sampling method with a fixed number of six trees per subunit was utilized.
- Sampling subunits were arranged in a Maltese cross pattern.
Main Results:
- Selective thinning was found to significantly increase volumetric variability within compartments.
- Site quality variations within compartments led to increased volumetric variance, proportional to site quality.
- Stratification by site quality resulted in a substantial reduction of within-stratum variance, up to 91%.
Conclusions:
- Site-specific stratification is a more accurate approach for forest inventory than traditional methods.
- This methodology enhances the precision of volumetric estimates for Pinus elliottii stands.
- The findings support improved forest management strategies through more refined inventory techniques.
