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LCZO -- Soil Biogeochemistry -- Iron and carbon cycling -- El Verde Instrumented hillslope -- (2016-2016)
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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).
Subject Keywords
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Spatial
Temporal
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Additional Metadata
| Name | Value |
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| 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 |
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 |
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This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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