Abstract:La diversidad de plantas vasculares está relacionada con la productividad y resiliencia de los bosques, por lo tanto, el desarrollo de indicadorespara su caracterización es fundamental. La riqueza de especies vasculares (S) ha mostrado ser un buen indicador de la diversidadde otros grupos biológicos. Asimismo, se ha propuesto que la riqueza de tipos funcionales de plantas (Sg), se correlaciona significativamentecon la riqueza de especies y, por lo tanto, puede ser usada como un indicador sustituto. En este tra… Show more
“…Disturbance agents affect the dispersion of observed patterns, but do not modify trends, implying general conditions of equilibrium. The assessment of species richness requires taxonomic knowledge, which implies sources of error in the estimates (Sánchez et al, 2021), as well as time and resources. The use of indirect variables, such as projective leaf cover, facilitates the estimation process.…”
The establishment of relationships between the water balance coupled to the atmosphere and species richness, for a given ecosystem, allows characterizing the state of vegetation under stable conditions. The proposal by Specht and colleagues of the water relationship between actual evapotranspiration/potential evapotranspiration (Ea/Eo), mediated by the evaporative coefficient k, allows to establish empirical relationships, without implying a cause-effect relationship, between the projective leaf cover (CPF) and the richness of plant species in relation to k. These relationships were reviewed with information from sampling sites established in sacred fir [Abies religiosa (Kunth) Schltdl. & Cham.] forests of the warm temperate climatic region of Mount Tlaloc, State of Mexico. Species richness and CPF of the upper stratum of the forests were measured, and the aboveground biomass was estimated. The patterns of the relationship between the CPF of the upper stratum and the total number of species showed variations within the limits of Specht’s equilibrium relationship, even though the levels of disturbing agents in the sites showed a greater dispersion of the data. Establishing a relationship between projective leaf cover and species richness facilitates estimates in plant diversity conservation projects.
“…Disturbance agents affect the dispersion of observed patterns, but do not modify trends, implying general conditions of equilibrium. The assessment of species richness requires taxonomic knowledge, which implies sources of error in the estimates (Sánchez et al, 2021), as well as time and resources. The use of indirect variables, such as projective leaf cover, facilitates the estimation process.…”
The establishment of relationships between the water balance coupled to the atmosphere and species richness, for a given ecosystem, allows characterizing the state of vegetation under stable conditions. The proposal by Specht and colleagues of the water relationship between actual evapotranspiration/potential evapotranspiration (Ea/Eo), mediated by the evaporative coefficient k, allows to establish empirical relationships, without implying a cause-effect relationship, between the projective leaf cover (CPF) and the richness of plant species in relation to k. These relationships were reviewed with information from sampling sites established in sacred fir [Abies religiosa (Kunth) Schltdl. & Cham.] forests of the warm temperate climatic region of Mount Tlaloc, State of Mexico. Species richness and CPF of the upper stratum of the forests were measured, and the aboveground biomass was estimated. The patterns of the relationship between the CPF of the upper stratum and the total number of species showed variations within the limits of Specht’s equilibrium relationship, even though the levels of disturbing agents in the sites showed a greater dispersion of the data. Establishing a relationship between projective leaf cover and species richness facilitates estimates in plant diversity conservation projects.
La relación entre la productividad/producción de la vegetación y la riqueza de especies de plantas vasculares es importante para analizar la respuesta de la vegetación ante disturbios, la cual se ha abordado con diferentes enfoques y marcos teóricos, aunque con resultados insuficientes para explicar la variabilidad observada. Las relaciones propuestas por Specht y colaboradores establecen relaciones no lineales entre la cobertura proyectiva foliar (CPF) y la riqueza de especies (S) bajo condiciones de equilibrio y de sucesión vegetal. Para analizar las relaciones CPF-S se realizaron muestreos en diferentes tipos de vegetación en las ocho regiones forestales definidas por Probosque en el Estado de México, en las que se establecieron 682 parcelas de muestreo de 1 000 m2 cada una. La relación establecida entre la CPF con respecto a S, caso de valores máximos de S, evidenció patrones congruentes con los planteamientos empíricos de Specht y colaboradores, particularmente, en función de los estados de la sucesión de bosques/selvas. Adicionalmente, las relaciones para matorrales y pastizales están establecidas. Los resultados de los análisis mostraron relaciones potenciales entre S y la CPF del estrato superior e inferior, en las cuales sus parámetros están relacionados entre sí, lo que simplifica el proceso de estimación a un solo parámetro.
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