We deployed a fertilized root ingrowth core experiment across a contrast in topographic position (ridge vs. slope) on two soil parent materials (volcaniclastic and quartz diorite) in the Luquillo Mountains of eastern Puerto Rico.
• Neither nitrogen (N) nor phosphorus (P) stimulated root ingrowth relative to control cores in either topographic position on either parent material.
• Cores on ridges had 1.5x more root biomass than those on slopes, regardless of parent material or fertilizer treatment.
Sullivan, C.A., Goldsmith S., Porder S. (2013): A landscape-scale assessment of nutrient limitation in the tropical forests of Luquillo, Puerto Rico. 2013 Fall Meeting, AGU, San Francisco, Calif .
(52 MB pdf)
Poster presented at AGU