Litterfall of tropical forested wetlands of Veracruz in the coastal floodplains of the Gulf of Mexico.

摘要

Canopy productivity of five seasonally flooded forests in the central area of the Gulf of Mexico was estimated by measuring the litterfall. Productivity was estimated on a monthly basis from November 2005 to October 2006, and values ranged between 9 and 15 t ha-1 yr-1. A total of 57 plant species were recorded based on the litter collected. The dominant species (Pachira aquatica, Annona glabra, Hippocratea celastroides and Dalbergia brownei) were the principal litterfall producers. The contribution of two life forms was assessed: trees (including trees, shrubs and palms) and lianas (climbers, lianas and creepers). Lianas were found to be extremely productive and represented between 8 and 62% of the total litterfall at the sampled locations. Leaves contributed most to the litter, followed by branches and reproductive structures. Fruit and seed fall coincided with the rainy season, and accounted for 50-90% of the production and shedding during the flooded season. Species that released seeds during this time had their seeds dispersed by water. Flower production occurred during the dry season (March-June). Species richness did not explain litterfall productivity. The litterfall productivity of these forests is similar to that of mangrove ecosystems.