Bibliographic citations
Bonilla, J., (2014). Modelo bio-económico forestal: tasa de descuento y rotación forestal en el caso del Romerillo Blanco en Ecuador [Tesis, Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/2355
Bonilla, J., Modelo bio-económico forestal: tasa de descuento y rotación forestal en el caso del Romerillo Blanco en Ecuador [Tesis]. : Universidad Nacional Agraria La Molina; 2014. https://hdl.handle.net/20.500.12996/2355
@mastersthesis{renati/724868,
title = "Modelo bio-económico forestal: tasa de descuento y rotación forestal en el caso del Romerillo Blanco en Ecuador",
author = "Bonilla de Gracia, Juan Antonio",
publisher = "Universidad Nacional Agraria La Molina",
year = "2014"
}
The purpose of this paper is to obtain and present the optimal Bio-Forestry and Bio economic extraction of white romerillo (Retrophyllum rospigliosii Pilg. C.N. Page) in Ecuador, through the optimization of time series. For this study, it was necessary to show that the optimal biological felling is explained by two biological variables that produce the cutting cycles: the heterogeneous age of the trees and the commercial quantity of wood without bark (wood volume), taken from temporary forest plots of the Numbala Reserve (Zamora Chinchipe - Ecuador). It was necessary to optimize three equations or growth functions, such as the quadratic, Schumacher and Chapman−Richards that were linearized and estimated using the Ordinary Least Squares Method (OLS) in order to obtain optimal felling values that determine the biological cutting cycle. When estimating the commercial volume of wood without bark for the white romerillo, the following data was found: an average volume of 140.11 m³/ha, heterogeneous age of the trees between 4 and 427 years of age, optimal biological felling values using the quadratic equation 76 years, Schumacher 77 years, and Chapman-Richards of 189 years. For the bio-economic equilibrium, two criteria for forest cutting cycles were used: the first based on the net present value NPVTC (Fisher−Hotelling, F−H theorem) and the second based on the value of the forest land cutting cycle VFLTC (Faustmann−Pressler−Ohlin, FPO, model or theorem). The FPO model included, in addition to the variables of the Fisher−Hotelling model, the value of the income of the land. To develop the F-H model, the discounted value of all revenue and expenses during the cutting cycle was maximized; while to develop the FPO theorem, the net present value of the income of the land was maximized by introducing the values in the appropriate equation in order to obtain the optimal values of economic felling that maximizes the benefits of the forestry sector, simulating the exploitation dynamics of white romerillo. The Bio-economic forestry model of F-H considered the wood extraction level of Schumacher (the functional Bio-forestry equation that presented the best statistical significance) and the discount rate of 1%, for this purpose an economical cutting age in the stand of forest of the white romerillo of 101 years, with of NPVTC of $ 1,164.16/ha was registered. However, using the Faustmann−Pressler−Ohlin theorem (FPO), the cutoff age was of 102 years with a VFLTC of $ 1,137.95 / ha. The differences are slightly significant. However, the economic felling value of FPO is considered a more comprehensive indicator because it includes the value of the forest land.
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