%0 Journal Article
%T Modelos para la estimaci¨®n del ¨ªndice de sitio para Pinus durangensis Mart¨ªnez en San Dimas, Durango
%A L¨®pez Hern¨¢ndez
%A Juan Antonio
%A Valles G¨¢ndara
%A Arturo Gerardo
%J Ciencia forestal en M¨¦xico
%D 2009
%I Scientific Electronic Library Online
%X site index is the most commonly used method in mexico and in several countries to estimate the productivity of forest lands, since it is a numerical expression easy to understand and density-free. the objective of this work was to adjust model groups to predict the site index of pinus durangensis from data of a the remeasurement of 12 permanent plots settled in a natural forest in the ejido vencedores at san dimas, durango. thirteen mathematical models were adjusted through the mean square procedure, ten of which are linear and three non-linear. were adjusted three groups of models of linear simple regression, logarithmic,quadratic and a mixed model. in regard to the three non-linear, the chapman-richards and schumacher functions as well as the weibull model were tested. the best models were selected according to the degree of adjustment or pseudo r2, the f test, the mean square error (mse), the test of hypothesis of the estimators and the sign of the parameter. results show that provided the best site index estimation was the logarithmic 6 (ln[e/h] = ¦Â0 + ¦Â1[1/e]) since it revealed the highest values for the residual r2 test, which was 0.7419; mse was 0.01608 and 221.304 in the f test.
%K chapman-richards function
%K schumacher function
%K site index
%K logarithmic model
%K weibull modell
%K pinus durangensis.
%U http://www.scielo.org.mx/scielo.php?script=sci_abstract&pid=S1405-35862009000100010&lng=en&nrm=iso&tlng=en