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Gewählte Master / Diploma Thesis:

Ramin Derakhshifar (2021): Variation of wood anatomy in trees from a Mexican rainforest.
Master / Diploma Thesis - Institut für Botanik (Botany), BOKU-Universität für Bodenkultur, pp 70. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
The anatomy of tropical rainforest wood can vary greatly among different tree species. In this study, a total of 126 wood samples from 42 tropical rainforest tree species from Chajul, Mexico, were examined. Wood cross-sections of the samples were made to measure the cross-sectional area and cell wall thickness of water-conducting vessels. These were found to vary greatly from species to species in all parameters. Different growth strategies of species can lead to different vessel characteristics. In this regard, a certain trade-off of wood properties takes place with respect to the tree's growth and survival strategy. Slow-growing, shade-tolerant species tend to have smaller vessels and higher vessel densities and invest in higher wood specific gravity (WSG) and less in their diameter growth. Smaller vessels conduct water efficiently, but their relatively thicker cell walls are more resistant to implosion, which leads to greater safety for the tree and may also increase their life expectancy. Fast-growing pioneer species, which are less shade tolerant, have larger vessels and lower vessel density, they invest more in growth with lower WSG, which leads to less mechanical and hydraulic safety for the tree and is correlated with lower life expectancy. Larger vessels can conduct more water, but are more susceptible to implosion, pests, and diseases due to relatively thinner cell walls. Pioneer trees have advantages in the early phase of succession because they find optimal light conditions. The fast growth characteristics give them a selective advantage over other species when the canopy opens. To survive, they must be able to grow fast and consume available resources quickly. Therefore, a high growth rate is an important part of their survival strategy.

Beurteilende*r: Hietz Peter

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