Efectos de la cosecha de la corteza en la biología de una población de Elaeodendron transvaalense Jacq.

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Abstract

Elaeodendron transvaalense Jacq. es una de las especies vegetales medicinales comúnmente utilizada por los habitantes en la región de Venda. La especie permite tratar una variedad de enfermedades. Es ampliamente usada e importante para los curanderos tradicionales. Debido a esto, llegó a los mercados muthi, y está entre las siete especies de plantas más comercializadas en la región de Venda. Este estudio investigó el impacto de la cosecha de la corteza en la estructura de la población de esta especie. El estudio mostró que aunque el nivel de cosecha es alto, la especie es capaz de resistir el estrés desde que es una especie de grano fino. La población también mostró la capacidad de regenerarse desde que exhibió una curva de J inversa. El estado de salud de la corona generalmente fue bueno aunque algunos individuos, que fueron el 9% de la muestra, tuvieron coronas muertas, lo que es un motivo de preocupación. Se observó una relación lineal entre la circunferencia del tallo y áreas cosechadas. Esto se entiende considerando la gran área de superficie de corteza cosechable en los individuos más grandes.

Translated abstract

Elaeodendron transvaalense Jacq. is one of the medicinal plant species commonly used by people in the Venda region. The species is known to treat a variety of diseases. It is widely used and important to traditional healers. Because of this, it found its way into the muthi markets, and it is among the seven most commonly traded plant species in the Venda region. This study investigated the impact of bark harvesting on the population structure of this species. The study revealed that although the level of bark harvesting is high, the species is able to resist that stress since it is a fne-grained species. The population also showed the ability to regenerate as it exhibited an inverse J-shaped curve. The crown health status was generally good although some individuals, contributing 9% of the sample, had dead crowns, which are a cause for concern. A linear relationship was noticed between areas harvested and stem circumference, which is understandable considering the large surface area of harvestable bark on bigger individuals.

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Most cited references 62

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Predicting population trends from size distributions: a direct test in a tropical tree community.

R Sukumar, R Condit, D S HUBBELL … (1998)

Forest ecologists often evaluate how well the species composition of saplings in the understory matches that of the canopy: absence of juveniles suggests that a tree species is suffering population decline. Here we offer a theoretical and empirical test of this assertion using data from a 50-ha census plot in Panama. Theory indicates that higher rates of population change, lambda, lead to more steeply declining size distributions (more juveniles relative to adults). But other parameters also affect the size distribution: lower growth rate of juveniles and lower survival at any size produce more steeply declining size distributions as well. Empirical evaluation of 216 tree populations showed that juvenile growth was the strongest predictor of size distribution, in the direction predicted by theory. Size distribution did correlate with population growth, but weakly and only in understory species, not canopy species. Size distribution did not correlate with the growth rate of larger individuals nor with survival. Results suggest that static in formation on the size distribution is not a good predictor of future population trends, while demographic information is. Fast-growing species will have fewer juveniles in the understory than slow growing species, even when population growth is equal.