Luquillo CZO presentations given at AGU fall meeting 2011, listed with name of presenter.

1) How does the quantity and quality of soil organic matter change as a function of soil profile depth:
-in old, highly weathered oxisol profiles versus younger, granitic inceptisol profiles?
-in three different forest types: Tabunuco, Colorado and sierra palm?
2) How do soil microbial community structure and functional characteristics change with depth across contrasting parent materials and forest types?
3) Can we relate microbial community characteristics to SOM quantity and quality?

The hydrologic, geomorphic, and ecological dynamics of tropical montane
streams are poorly understood in comparison to many temperate and/or alluvial rivers.
Yet as the threat to tropical freshwater environments increases, information on the
dynamics of relatively pristine streams is important for understanding landscape
evolution, managing and conserving natural resources, and implementing stream
restoration. This dissertation characterizes the geomorphology and hydrology of five

Luquillo CZO presentations given at CZO all hands meeting, listed with name of presenter.

Key Science Questions Involved:
1 – Large scale: When where the Luquillo Mountains uplifted to their present height?
2 – Mesoscale: The last 500-600 m of uplift generated a conspicuous wave of erosion still propagating toward the mountain tops. What is the magnitude of the spatial variability in erosion rate associated with this wave?

Key Science Questions Involved:
1. What is the relative importance of abrasion versus selective transport in causing downstream fining of river sediments?
2. What is the fraction of fine material that is produced by abrasion of gravel?