Treesearch

Interception losses were monitored for one year and related to vegetation characteristics in two forested watersheds in the Luquillo Experimental Forest of Puerto Rico. Total watershed interception was then modeled by weighting values of throughfall measured in representative areas of different vegetation types by the total watershed area of that vegetation group. Annual canopy throughfall equaled 59% of annual rainfall whereas stemflow represented 2.3%. Canopy throughfall was greatest in gaps and along stream channels with 91% of the total falling over 75% of the watershed area. However,...

Successive inventories in Puerto Rico provided the first estimates of secondary forest growth on a regional basis. The volume of growing stock trees increased by 32%, and timber volume by nearly 36%, on all classes of forest land between 1980 and 198.5. Timber volume growth rates (in m’ha-’ yr-’ ) varied by forest class and averaged 2.0 in young secondary forest, 6.9 in advanced secondary forest, 7.1 in abandoned coffee shade forest, and 1.2 in active coffee shade forest. Tree diameter growth rates were weakly correlated with initial tree diameter (r ’ = 0.16, n = 1090). A slight increase...

This paper describe the hydraulics of unsubmerged flow for 5 culverts in the Luiquillo Esperimental Forest of Puerto Rico. A General equation based on empirical data is presented to estimate culvert discharge during unsubmerged conditions. Large culverts are needed in humid tropical montane areas than in humid temperatute watersheds and are usually appropriate only for drainage less than 1km2.