Empowering Forest Owners with Simple Volume Equations for Poplar Plantations in the Órbigo River Basin (NW Spain)
Open Access
- 23 January 2021
- Vol. 12 (2), 124
- https://doi.org/10.3390/f12020124
Abstract
Hybrid poplar plantations are becoming increasingly important as a source of income for farmers in northwestern Spain, as rural depopulation and farmers aging prevent landowners from planting other labor-intensive crops. However, plantation owners, usually elderly and without formal forestry background, lack of simple tools to estimate the size and volume of their plantations by themselves. Therefore, farmers are usually forced to rely on the estimates made by the timber companies that are buying their trees. With the objective of providing a simple, but empowering, tool for these forest owners, simple equations based only on diameter were developed to estimate individual tree volume for the Órbigo River basin. To do so, height and diameter growth were measured for 10 years (2009–2019) in 404 trees growing in three poplar plantations in Leon province. An average growth per tree of 1.66 cm year−1 in diameter, 1.52 m year−1 in height, and 0.03 m3 year−1 in volume was estimated, which translated into annual volume increment of 13.02 m3 ha−1 year−1. However, annual volume increment was different among plots due to their fertility, with two plots reaching maximum volume growth around 11 years since planting and another at 13 years, encompassing the typical productivity range in plantations in this region. Such data allowed developing simple but representative linear, polynomial and power equations to estimate volume explaining 93%–98% of the observed variability. Such equations can be easily implemented in any cellphone with a calculator, allowing forest owners to accurately estimate their timber existences by using only a regular measuring tape to measure tree diameter. However, models for height were less successful, explaining only 75%–76% of observed variance. Our approach to generate simplified volume equations has shown to be viable for poplar, but it could be applied to any species for which several volume equations are available.Keywords
This publication has 32 references indexed in Scilit:
- Multimodel simulations of forest harvesting effects on long‐term productivity and CN cycling in aspen forestsEcological Applications, 2014
- The effects of spacing on growth, morphology and biomass production and allocation in two hybrid poplar clones growing in the boreal region of CanadaTrees, 2012
- A reduced growth model based on stand basal area. A case for hybrid poplar plantations in northeast SpainForest Ecology and Management, 2010
- A wish, a fear and a complaint: understanding the (dis)engagement of forest owners in forest managementEuropean Journal of Forest Research, 2009
- Complexity in modelling forest ecosystems: How much is enough?Forest Ecology and Management, 2008
- Dynamic growth model for I-214 poplar plantations in the northern and central plateaux in SpainForest Ecology and Management, 2008
- Testing the performance of a forest ecosystem model (FORECAST) against 29 years of field data in aPseudotsuga menziesiiplantationCanadian Journal of Forest Research, 2007
- The Use of Simplified or Misspecified Models: Linear CaseThe Canadian Journal of Chemical Engineering, 2007
- Projected long-term productivity in Saskatchewan hybrid poplar plantations: weed competition and fertilizer effectsCanadian Journal of Forest Research, 2007
- Evaluating forest growth modelsEcological Modelling, 1997