Sostenibilidad de Dalea lutea en bosque mixto y pastizal en Tenancingo, Estado de México

the goals of this study were to assess the behavior, dynamics and sustainability of populations of dalea lutea (cav.) willd. in mixed forest and grassland under natural conditions and of recollection. the investigation was carried out in a pine-oak forest near tenancingo, mexico state (mexico), from autumn 2002 to autumn 2004. four plots were marked in each zone and the individuals counted were classified in three types: seedlings, young and adults; the data were subject to analysis of variance, test of means and sustainability formulae. the population dalea lutea increased in summer-autumn and decreased in winter-spring. samplings showed statistical differences for seedlings and young, but not for adults, but when these classes were evaluated within zones they did not differ statistically; the largest number of individuals was reported during summer, autumn and winter of 2003. regarding sustainability, there was a reestablishment within the pasture at the end of the period of 59.5 and 41% for seedlings and adults, respectively, and a reduction of 79% in young individuals; in the mixed forest, seedlings and the young plants decreased by 4.4 and 16.2%, while adults recovered in 25.1%. the population of dalea lutea increased or decreased according to the time of sampling, and the number of individuals was determined by precipitation. under the current conditions of collection, d. lutea population remains stable in the mixed forest and it is recovering better in the grassland.