El presente estudio tuvo como objetivo ajustar ecuaciones lineales y no lineales para estimar carbono, por componente de acículas, ramas, fuste y total. Los resultados indican que en el ámbito individual, el componente total muestra los mejores estadísticos de ajuste, mientras que las mayores variaciones se detectan en las ramas y en el fuste. Adicionalmente se analizan porcentajes de biomasa por componente donde se observa que el fuste aporta el 46.90 % de la biomasa, las acículas el 35.60 % y las ramas solamente el 17.30 % de la biomasa total. Asimismo, dentro de este rango de edad, la biomasa en el fuste aumenta anualmente 2.96 %, la biomasa en las acículas disminuye 3.13 % y la biomasa en las ramas aumenta 0.17 %.

El presente estudio tuvo como objetivo ajustar ecuaciones lineales y no lineales para estimar carbono, por componente de hojas, ramas, fuste y total. Los resultados indican que, en el ámbito individual, el componente total muestra los mejores estadísticos de ajuste; mientras que las mayores variaciones se detectan en las ramas y en el fuste. Adicionalmente, se analizaron porcentajes de biomasa por componente donde se observa que el fuste aporta el 57% de la biomasa, las hojas el 9% y las ramas solamente el 34% de la biomasa total.

Tree aboveground biomass (e.g., bole, branches, and foliage), M, plays key roles in forest management as it is the basis for evaluating the sink and flux of, for example, carbon and nitrogen, stand productivity, dendro-energy, litter & root biomass, hydrological parameters, among others. With the aim of further simplifying and understanding M, the central objective of this research was to review available techniques to develop, test, and validate two independent novel non-destructive, semi-empirical models using four major M datasets: (i) the shape dimensional bio-physical, MSD; and (ii) the restrictive mathematical, MNR, models. The proposed models advance and test how each of both approaches: (i) constant or (ii) variable scalar coefficients perform when predicting M with major assumptions bearing bio-physical principles. Results showed that M has to be predicted eventually with variable scalar coefficients; both models predicted compatible M figures; the evaluations matched the conventional equation well; and the independent data sets were well validated; the coefficients of determination, r2, and the standard errors, Sx%, had values > 96% and <20%, respectively, for most tested conifer tree species. In spite of demonstrating empirically and physically the ontogenetic-dependency of scalar coefficients, the MNR model, with constant β-scalar and variable a-intercept coefficients, performed slightly better, and precision appeared to be a function of the tree species growing in different forest ecosystems. Therefore, better parameterization advances for the testing and validation of the MSD model that uses variable scalar coefficients, which are consistent with ontogenetic principles, are preliminarily recommended for M assessments. The updated revision of models, the independent development, the construction using different assumptions, the individual mathematical and bio-physical parameterization, the consistency on M assessments, and the bearing of physical and biological properties are key pieces of scientific information presented in this report are required in modern forest management when predicting M and associated variables and attributes.

What the purpose of having panorama of the nature tourism of the centro ecoturistico Puentecillas, the present study was carriedout, through surveys of visitors and potential tourists from the cities of El Salto and Durango, Durango,the results show that theobjectives of nature tourism are unknown and there is confusion with the different segments such as adventure tourism, ruraltourism and ecotourism has the registration in an ecotourism network, however there are no well-defined products for this segment,there is general information on the forest management program, but it is not updated there are no technical fundamentals of thefocal and complementary elements, only forest inventory information and does not exist a catalog of activities the study potential todevelop activities of ecotourism as workshops of environmental education. Observation of flora and fauna, bird watching, photosafari, interpretive trekking, participation in flora and fauna, rescue programs and camps. The eco-center has a good infrastructureof eco-accommodation, however, there are several services missing, there is also no annual operational plan there is also a lack ofmaintenance of the support elements such as eco-houses, footpaths and viewpoints. The trails lack technical specifications, there areno drainage openings, rainwater channels through which to direct the waters of rain. The ecotourism center presents very littleimplementation of eco technology to manage environmental impacts lack of a vision mission objectives goals programs of workbudget responsible for execution, indicators systems it is important to develop strategies that improve the conditions of the center toplan the growth in a sustainable way.