Models of diameter growth for Nothofagus dombeyi were developed and the selected model used for this study was non-linear and known as Bertalanffy-Richards. It was fitted from three main data sources: permanent plots (with only two measurements each), stem analysis and tree cores. The data was divided into social strata and then, for each stratum, the model was fitted according to the variables: diameter annual increment (id) and diameter at breast height (dap). The fitting, and both biological and statistical analysis, was carried out taking two different data sets into account: an independent data set, provided by permanent sample plots; and a growth series, provided by tree increment cores and stem analysis. Models with different uses were obtained through both data sets. With the independent data, we obtained models that allowed us to predict the diameter annual increment in a short time and, with the growth series, we obtained models of a high biological significance. In this sense, the biological significance of the parameters from each model was discussed when they were fitted. An interpretation of the dynamic growth of the species studied has been undertaken through the biological models under different competence status.
To understand the dynamic of Nothofagus forests in Argentina's Northern Patagonia, the behaviour of some fundamental biological laws related to stand density and mortality were studied. This paper presents the results of applying the law of -3/2 or self-thinning rule to pure and mixed stands of Nothofagus species. Although there are many equations related to this law, it was decided to mainly work with the potential relationship between number of trees and the mean diameter of the stand (Reineke 1933). Also, the mean volume and number of trees relationship was examined. Data from temporal and permanent sample plots were used. For the different forest types, different equation adjustments were made with two different methods: regression and graphical analysis. Two maximum linear trends for size-density relationship were obtained: the fisrt one up to a diameter of 30 cm and the second one over this size. The equations adjustment by means of two methods resulted in a steeper slope than the universal -1,605. The stands containing N. nervosa displayed the lowest maximum density line. The behaviour of the law was characterised. Also, the Relative Density Index for Nothofagus forests was determined.
RESUMEN.Los bosques del norte de la Patagonia tienen una larga historia de uso, siendo uno de los ecosistemas forestales más estudiados de Argentina. Sin embargo, existen pocos ejemplos de bosques nativos bajo manejo sustentable. Proponemos que esto se debe principalmente a la falta de voluntad de las autoridades de aplicación, organismos de gestión, investigadores y técnicos del sector por asistir a productores forestales en la implementación de la legislación vigente. Históricamente, los productores han sido ignorados por un sistema administrativo que no ha buscado adaptarse a sus necesidades, y por un sistema científico-tecnológico que no ha utilizado sus conocimientos empíricos para generar propuestas realistas de manejo. Consideramos que, si bien el manejo sustentable de los bosques patagónicos pareciera ser técnicamente viable, su implementación dependerá de la voluntad del sector público por generar las condiciones para un diálogo intersectorial que integre distintos tipos de saberes.[Palabras clave: gestión forestal, confianza, productores, sistema científico-tecnológico, uso del suelo] ABSTRACT. Can we sustainably manage the native forest of North Patagonia? The native forests of Northern Patagonia have a long history of human use, being one of the most studied ecosystems of Argentina. However, there are few examples of sustainably managed native forests. We propose that this is mainly due to the lack of political will from regional authorities, forest administration agencies, technicians and researchers in assisting forest owners to implement current legislation. Historically, forest owners have been ignored by an administrative system that has not considered their needs as well as by a scientific-technologic system that not used their empirical knowledge to develop realistic management packages. We consider that, even though the sustainable management of Patagonian native forests seems to be technically feasible, its implementation will depend on the will of the public sector to generate better conditions for an intersectoral collaboration that integrates different kinds of knowledge.
Researchers dealing with conservation subjects usually do not put the results of their work into practice, even when the primary purpose of their research is the preservation of biodiversity. In the South American temperate forests we identified an area with the highest genetic diversity in Argentina of Nothofagus nervosa, one of the most relevant southern beech species. Based on the information of our scientific study and our recommendations, the authorities of Lanin National Park changed the protection status of this area to avoid logging. The new forestry management plans include consideration of "high genetic diversity" in decisions on where logging will be allowed. Results of our initial genetic study induced the analysis of biodiversity at the species and ecosystems levels, which yielded results similar to our genetic studies. A strong connection among researchers and managers from the onset of our study and the awareness of the former about the importance of the implementation of the research work were key to bridging the gap between conservation research and conservation practice.
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