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Leaf dimension analysis and inter-elemental correlation in soil and leaf samples were carried out with standard regression and correlation procedures. Potassium was weakly positively correlated with OM, N and negatively with pH. In Quintana Roo soils had a clay-loam texture, were slightly alkaline, pH averaging 7.

The samples from control plots Xhazil forest in Ejido Xhazil had the highest concentrations of C, N, and exchangeable Mg. In this site concentration of organic matter calculated by multiplying C concentration by 1.

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Effects of partial overstory removal on the natural regeneration of a tropical forest in Quintana Roo, Mexico. Recent Literature on BigLeaf Mahogany. Catastrophic disturbance, logging and the ecology of mahogany Swietenia macrophylla King: This book reports on vital research on the ecology of big-leaf mahogany, Planting took place in along trails separated 10 m from each other, and the plants separated 3 m from each other.

Soil Al availability was higher in Tramontina compared to Quintana Roo in concordance with their lower pH. However, extractable P was significantly higher in Tramontina soils. Leaves from Fazenda Tramontina were significantly larger and heavier than those of Quintana Roo Table 1. The leaf composition of the mahogany provenances planted in Tramontina did not reveal significant differences in any of the measured parameters, therefore, average values are included in Table 2 for comparison with samples from Quintana Roo.

Leaf nutrient concentrations in leaves from Tramontina and the sites in Quintana Roo were remarkable by their similarities. Nitrogen and K had similar concentrations in spite of the large differences observed for these elements in the soil samples compare Figure 1 and Table 2. Calcium was lower in Tramontina leaves than in most Quintana Roo samples, but differences were smaller than expected considering soil Ca availability. The higher concentrations of P in Tramontina leaves corresponded to the measured levels of soil extractable P.

Also, Al was less concentrated in Tramontina leaves in spite of its higher soil availability. The same ratios calculated for leaf values amounted to for Tramontina and 78 for Quintana Roo. Leaf Carbon and Nitrogen Isotopic Signatures. Nitrogen isotope ratios showed also a similar range between the extreme values 2.

Big-Leaf Mahogany : Genetics, Ecology, and Management

The organic matter concentration of Quintana Roo soils was in average more than 12 times higher than the one of Tramontina. However, average soil extractable P was higher in Tramontina compared to Quintana Roo. In addition, plantations in Quintana Roo were established in mature or secondary forests, with denser vegetation cover of other species besides mahogany, as a result, available P was more rapidly taken up by the fine root mass. The high degree of tolerance of big-leaf mahogany to a wide range of nutrient availability is expressed in the convergence of leaf nutrient concentration levels, compensating for large differences in soil availability of N, P, Ca, and regulating Al uptake.

While the soils ratios varied from 0. However, lower rainfall in Quintana Roo is probably the cause of smaller leaf sizes in this site, emphasizing the importance of plasticity in leaf development to adapt to water stress.

Nitrogen isotopic ratios were not related to N concentration in the leaves, and differed significantly between localities. The source of this variation is probably related to mineralization processes in the soil. Results showed that big-leaf mahogany plantations may be established on soils of contrasting pH and texture, and leaf nutrient concentrations converged to similar levels in spite of contrasting element availability in the soil. Natural abundance of 15 N in leaves was consistently higher in the sandy soils of Tramontina Farm indicating more effective mineralization of organic matter.

This research was conducted in cooperation with the University of Puerto Rico. Criticisms of two RARV reviewers improved the original version of this paper.

Sanctum: Roman (Pakt der Dunkelheit) (German Edition);
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On a Rock: Building a solid financial foundation.

The ecology, silviculture and biogeography of mahogany Swietenia macrophylla: Perspectives Plant Ecology, Evolution and Systematics, v. Carbon isotope fractionation and plant water-use efficiency.

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Stable isotopes in ecological research. Ciencia Forestal en Mexico , v. Mahogany in the Brazilian Amazon: Ecology and Perspectives of Management. Forest Ecology and Management, v. Botanical Journal of the Linnean Society , v.

Lugo , Julio C. Big-Leaf Mahogany is the most important commercial timber species of the tropics. This book reports on vital research on the ecology of big-leaf mahogany, including genetic variations, regeneration, natural distribution patterns and the silvicutural and trade implications for the tree.

Genetic Variation in Natural Mahogany Populations.

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