You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Nutrient Fluxes in Bulk Precipitation and Throughfall in Two Montane Tropical Rain Forests, Colombia
E. J. Veneklaas
Journal of Ecology
Vol. 78, No. 4 (Dec., 1990), pp. 974-992
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/2260947
Page Count: 19
You can always find the topics here!Topics: Precipitation, Montane forests, Throughfall, Tropical rain forests, Forest canopy, Rain, Nutrient cycle, Forest soils, Plant ecology, Epiphytes
Were these topics helpful?See somethings inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
(1) The composition of bulk precipitation (rainfall plus dry deposition as collected by funnels) and throughfall water was studied during one year on a weekly basis in two epiphyte-rich Andean rain forests (Cordillera Central, Colombia, 2550 and 3370 m a.s.l.) (2) Nutrient input to the forest by bulk precipitation was higher at 2550 m because of larger precipitation volumes; rainfall was 2115 mm at 2550 m and 1453 mm at 3370 m. Losses of nutrients from the canopy, both total amounts and amounts per unit of precipitation, were also higher at 2550 m. (3) Net fluxes (throughfall flux minus bulk precipitation flux) and deposition ratios (ratio of throughfall flux to bulk precipitation flux) were generally within the range reported for other montane tropical rain forests. Differences between forests appear to be related to climate (mainly precipitation amounts), geographical situation (e.g. maritime influences) and the availability of nutrients in the soil. The patterns described in the present study are in accordance with other studies that show reduced cycling rates and limited availability of nitrogen and phosphorus in high-altitude rain forests. (4) Volcanic activity in the proximity of the forests (continuous SO2 emission and incidental ash-falls) was shown to affect precipitation chemistry. Inputs of SO4-S were high (26.2 and 16.8 kg ha-1 year-1 at 2550 and 3370 m, respectively) and correlated with rainfall acidity. As a consequence of an ash-fall, concentrations of Ca, Mg and SO4-S in bulk precipitation were far above average on one occasion. Throughfall concentrations fell to normal within two to three weeks in spite of low rainfall.
Journal of Ecology © 1990 British Ecological Society