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


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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).

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Resource Level 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:
End Date:

Content

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


OVERVIEW

Description/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).

Creator/Author

Barcellos, Diego|O'Connell,Christine S.|Silver, Whendee|Meile, Christof |Thompson, Aaron

CZOs

Luquillo

Contact

Miguel Leon, Miguel.Leon@unh.edu

Subtitle

Hot spots and hot moments of soil moisture explain fluctuations in iron and carbon cycling in a humid tropical forest soil




SUBJECTS

Disciplines

Biogeochemistry|Soil Science / Pedology

Topics

Soil Biogeochemistry

Subtopic

Iron and carbon cycling

Keywords

iron reduction; dissolved organic carbon; soil moisture; redox processes

Variables

silicon|aluminium|iron|calcium|magnesium|sodium|potassium|titanium|manganese|barium|cerium|chromium|caesium|dysprosium|Erbium|europium|gallium|gadolinium|hafnium|holmium|lanthanum|Lutetium|niobium|neodymium|praseodymium|rubidium|samarium|tin|strontium|tantalum|terbium|thorium|thulium|uranium|vanadium|tungsten|yttrium|Ytterbium|zirconium|ferric ion|ferrous ion

Variables ODM2

Silicon|Aluminum|Iron|Calcium|Magnesium|Sodium, dissolved|Potassium, dissolved|Titanium|Manganese|Barium, dissolved|Cerium|Chromium, total|Rare-earth elements|Niobium, total|Rubidium|Strontium, dissolved|Zirconium




TEMPORAL

Date Start

2016-05-03

Date End

2016-06-16




SPATIAL

Field Areas

El Verde Field Station

Location

El Verde Instrumented hillslope

North latitude

18.3027

South latitude

18.2743

West longitude

-65.8459

East longitude

-65.8117




REFERENCE

Citation

Diego Barcellos, Christine S. O’Connell, Whendee Silver, Christof Meile, Aaron Thompson. LCZO - Soil Biogeochemistry - Iron and Carbon cycling - El Verde (2016). https://doi.org/10.3390/soilsystems2040059

Publications of this data

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

CZO ID

7164



Additional Metadata

Name Value
czos Luquillo
czo_id 7164
citation Diego Barcellos, Christine S. O’Connell, Whendee Silver, Christof Meile, Aaron Thompson. LCZO - Soil Biogeochemistry - Iron and Carbon cycling - El Verde (2016). https://doi.org/10.3390/soilsystems2040059
keywords iron reduction; dissolved organic carbon; soil moisture; redox processes
subtitle Hot spots and hot moments of soil moisture explain fluctuations in iron and carbon cycling in a humid tropical forest soil
variables silicon, aluminium, iron, calcium, magnesium, sodium, potassium, titanium, manganese, barium, cerium, chromium, caesium, dysprosium, Erbium, europium, gallium, gadolinium, hafnium, holmium, lanthanum, Lutetium, niobium, neodymium, praseodymium, rubidium, samarium, tin, strontium, tantalum, terbium, thorium, thulium, uranium, vanadium, tungsten, yttrium, Ytterbium, zirconium, ferric ion, ferrous ion
disciplines Biogeochemistry, Soil Science / Pedology

References

Related Resources

The content of this resource serves as the data for: 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 (2019). 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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