Next Article in Journal
The Importance of Maintaining Upland Forest Habitat Surrounding Salamander Breeding Ponds: Case Study of the Eastern Tiger Salamander in New York, USA
Previous Article in Journal
Enrichment of Logging Gaps with a High Conservation Value Species (Pericopsis elata) in a Central African Moist Forest
Open AccessArticle

A Stand-Class Growth and Yield Model for Mexico’s Northern Temperate, Mixed and Multiaged Forests

Forest Hydrology and Watershed Management, Water Center for Latin American and Caribbean Countries, ITESM, Eugenio Garza Sada 2501, Colonia Tecnológico, Monterrey, NL 64849, Mexico
Forests 2014, 5(12), 3048-3069; https://doi.org/10.3390/f5123048
Received: 24 September 2014 / Revised: 19 November 2014 / Accepted: 1 December 2014 / Published: 9 December 2014
The aim of this research was to develop a stand-class growth and yield model based on the diameter growth dynamics of Pinus spp. and Quercus spp. of Mexico’s mixed temperate forests. Using a total of 2663 temporary, circular-sampling plots of 1000 m2 each, nine Weibull distribution techniques of parameter estimation were fitted to the diameter structures of pines and oaks. Statistical equations using stand attributes and the first three moments of the diameter distribution predicted and recovered the Weibull parameters. Using nearly 1200 and 100 harvested trees for pines and oaks, respectively, I developed the total height versus diameter at breast height relationship by fitting three non-linear functions. The Newnham model predicted stem taper and numerical integration was done to estimate merchantable timber volume for all trees in the stand for each diameter class. The independence of the diameter structures of pines and oaks was tested by regressing the Weibull parameters and projecting diameter structures. The model predicts diameter distributions transition from exponential (J inverse), logarithmic to well-balanced distributions with increasing mean stand diameter at breast height. Pine diameter distributions transition faster and the model predicts independent growth rates between pines and oaks. The stand-class growth and yield model must be completed with the diameter-age relationship for oaks in order to carry a full optimization procedure to find stand density and genera composition to maximize forest growth. View Full-Text
Keywords: Weibull pdf; maximum likelihood method; parameter variance; bias; pines and oaks Weibull pdf; maximum likelihood method; parameter variance; bias; pines and oaks
Show Figures

Figure 1

MDPI and ACS Style

Návar, J. A Stand-Class Growth and Yield Model for Mexico’s Northern Temperate, Mixed and Multiaged Forests. Forests 2014, 5, 3048-3069.

Show more citation formats Show less citations formats

Article Access Map by Country/Region

1
Only visits after 24 November 2015 are recorded.
Search more from Scilit
 
Search
Back to TopTop