LCZO -- Soil Biogeochemistry -- Iron and carbon cycling -- El Verde Instrumented hillslope -- (2016-2016)


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Owners: CZO LuquilloCZO National
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Created: Nov 19, 2019 at 8:04 a.m.
Last updated: Jul 24, 2020 at 3:25 p.m.
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Abstract

Soils from humid forests undergo spatial and temporal variations in moisture and oxygen (O2) in response to rainfall, and induce changes in iron (Fe) and carbon (C) biogeochemistry. We hypothesized that high rainfall periods stimulate Fe and C cycling, with the greatest effects in areas of high soil moisture. To test this, we measured Fe and C cycling across three catenas at valley, slope, and ridge positions every two days for a two-month period in a rainforest in Puerto Rico. Over 12 days without rain, soil moisture, FeII, rapidly reducible Fe oxides (FeIIIRR), and dissolved organic C (DOC) declined, but Eh and O2 increased; conversely, during a 10-day period of intense rain (290 mm), we observed the opposite trends. Mixed-effects models suggest precipitation predicted soil moisture, soil redox potential (Eh), and O2, which in turn influenced Fe reduction/oxidation, C dissolution, and mineralization processes. The approximate turnover time for HCl-extractable FeII was four days for both production and consumption, and may be driven by fluctuations in FeIIIRR, which ranged from 42% to 100% of citrate–ascorbate-extractable FeIII (short-range order (SRO)-FeIII) at a given site. Our results demonstrated that periods of high precipitation (hot moments) influenced Fe and C-cycling within day-to-week timescales, and were more pronounced in humid valleys (hot spots).

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
El Verde Field Station, El Verde Instrumented hillslope
North Latitude
18.3027°
East Longitude
-65.8117°
South Latitude
18.2743°
West Longitude
-65.8459°

Temporal

Start Date: 05/03/2016
End Date: 06/16/2016
Leaflet Map data © OpenStreetMap contributors

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Related Resources

The content of this resource is derived from Diego Barcellos, Christine S. O’Connell, Whendee Silver, Christof Meile, Aaron Thompson (2018). Hot Spots and Hot Moments of Soil Moisture Explain Fluctuations in Iron and Carbon Cycling in a Humid Tropical Forest Soil . Soil Systems http://dx.doi.org/10.3390/soilsystems2040059

How to Cite

Barcellos, D., C. S. O'Connell, W. Silver, C. Meile, A. Thompson (2020). LCZO -- Soil Biogeochemistry -- Iron and carbon cycling -- El Verde Instrumented hillslope -- (2016-2016), HydroShare, http://www.hydroshare.org/resource/3776d75974e04f33b8801bfc3503174a

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/
CC-BY

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