Research plan for the investigation of water, energy, and biogeochemical budgets in the Luquillo Mountains, Puerto Rico

Larsen, Matthew C.; Collar, Paul D.; Stallard, Robert F.

doi:10.3133/ofr92150

Cited by 11 publications

(4 citation statements)

References 49 publications

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“…Chemical weathering and solute transport in this watershed have been described in 17 many previous reports (e.g. Larsen et al 1993;White et al 1998;Stonestrom et al 1998 (USDA NRCS 2002). This soil has a thin A 1 horizon (< 0.1 m) and a weakly developed, clay-enriched Bw horizon above a 4-to 8-m layer 2 of saprolite.…”

Section: Methods 13mentioning

confidence: 86%

Bacterial Associations with Weathering Minerals at the Regolith-Bedrock Interface, Luquillo Experimental Forest, Puerto Rico

Minyard

Bruns

Liermann

et al. 2012

Geomicrobiology Journal

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Microbe-mineral associations in regolith overlying granodiorite bedrock (4.6-4.9 m depth) 1 from the Luquillo Experimental Forest, Puerto Rico, were imaged with confocal scanning 2 laser microscopy at a novel scale of 400X magnification. After adding BacLight™ stain, 3 proportionally more surface area of minerals (quartz, biotite, and mixed opaque 4 kaolinite/goethite) emitted fluorescence from cell-impermeant propidium iodide than from cell-permeant SYTO 9, which suggested greater coverage of minerals by extracellular DNA 6 or DNA in non-intact cells than by intact cells. Microscopic observations of predominantly 7 non-intact cell material in deep saprolite were consistent with the abundance of rRNA 8 sequences related to heterotrophic bacteria in clone libraries prepared from community DNA. 9 A few sequences were affiliated with bacteria recognized to produce siderophores, oxidize 10 Fe(II), or fix N 2. Bacterial DNA in deep regolith from two boreholes 1.5 m apart yielded 11 libraries with high diversity and taxa specific for each borehole. 12

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Section: Methods 13mentioning

confidence: 86%

Bacterial Associations with Weathering Minerals at the Regolith-Bedrock Interface, Luquillo Experimental Forest, Puerto Rico

Minyard

Bruns

Liermann

et al. 2012

Geomicrobiology Journal

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“…We must breach the barrier between the engineering (sediment and contaminant transport) and basic-science (biogeochemical cycles, ignoring sediment) approaches to watershed research. More sophisticated experimental design must be developed [Larsen et al, 1993;Poesen et al, 1996;Desmet and Govers, 1996]. Primary research must focus on landscapes that have undergone land-use change typical of large regions of the Earth's surface.…”

Section: Discussionmentioning

confidence: 99%

Terrestrial sedimentation and the carbon cycle: Coupling weathering and erosion to carbon burial

Stallard¹

1998

Global Biogeochemical Cycles

732

654

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The terrestrial sediment cycle is not in equilibrium. Agriculture, civil engineering, and mining mobilize vast quantities of soils, unconsolidated sediment, and bedrock, perhaps more than all natural geomorphic processes combined [Hooke, 1994]. The hydraulic architecture of the land has been transformed to serve agriculture, water supplies, land reclamation, navigation, and power generation. Few rivers lack dams and reservoirs; large rivers are confined to their channels by levees; normal floodplains are converted to paddy lands and aquiculture; water is mined; irrigation raises soil moisture and creates artificial distributary systems, and so forth. Agriculture has transformed a large Ëaction of the 231

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“…Although the species composition of Puerto Rico's secondary forests is currently different from that of its original forests, the forest trend in Puerto Rico suggests that the direct effects of deforestation may have little to do with amphibian extinctions and population declines in eastern Puerto Rico over the past three decades. Moreover, at the high elevations in the Luquillo Forest, where population declines have been observed, forests are stable ( Larsen et al 1993).…”

Section: Resultsmentioning

confidence: 99%

“…Crossing disciplines is sometimes difficult, and C. Carey, M. Larsen, K. Lips, D. Martin, several anonymous reviewers, and particularly E. Kalko provided patient and valuable reviews. Funding for this work was from NASA and the U.S. Geological Survey WEBB program ( Larsen et al 1993).…”

Section: Acknowledgmentsmentioning

confidence: 99%

Possible Environmental Factors Underlying Amphibian Decline in Eastern Puerto Rico: Analysis of U.S. Government Data Archives

Stallard¹

2001

Conservation Biology

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The past three decades have seen major declines in populations of several species of amphibians at high elevations in eastern Puerto Rico, a region unique in the humid tropics because of the degree of environmental monitoring that has taken place through the efforts of U.S. government agencies. I examined changes in environmental conditions by examining time-series data sets that extend back at least into the 1980s, a period when frog populations were declining. The data include forest cover; annual mean, minimum, and maximum daily temperature; annual rainfall; rain and stream chemistry; and atmospheric-dust transport.

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Research plan for the investigation of water, energy, and biogeochemical budgets in the Luquillo Mountains, Puerto Rico

Cited by 11 publications

References 49 publications

Bacterial Associations with Weathering Minerals at the Regolith-Bedrock Interface, Luquillo Experimental Forest, Puerto Rico

Bacterial Associations with Weathering Minerals at the Regolith-Bedrock Interface, Luquillo Experimental Forest, Puerto Rico

Terrestrial sedimentation and the carbon cycle: Coupling weathering and erosion to carbon burial

Possible Environmental Factors Underlying Amphibian Decline in Eastern Puerto Rico: Analysis of U.S. Government Data Archives

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