Dry Season Forest Panama (IMAGE) Smithsonian Tropical Research Institute Caption In Panama's lowland tropical forest, tree species growing on low phosphorus soils grew faster, on average, than species growing on high phosphorus soils. Credit STRI Archives Usage Restrictions Credit: Smithsonian Tropical Research Institute License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.