Impact of ecohydrological fluctuations on iron-redox cycling

Salvatore Calabrese, Amilcare Michele M. Porporato

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Because of its interaction with plants, carbon decomposition, and soil properties, soil iron cycle has been recognized as an important player in the carbon and other biogeochemical cycles. The impact of the hydrologic cycle and plants on it, however, remains largely unexplored. Here we focus on terrestrial ecosystems and develop a dynamical system to analyze the coupling between iron and carbon dynamics in the soil root zone as driven by fluctuations in soil moisture. Particular emphasis is placed on the modeling of the soil organic matter, the Fe-reducing population, the iron Fe 2+ -Fe 3+ cycling, and the soil moisture level, which controls the redox rates. Informed by laboratory and field measurements from a tropical forest, our results suggest that soil moisture and litterfall rates are the primary drivers of iron fluctuations at daily-to-seasonal temporal scales. We also emphasize the important role of soil iron cycle in the decomposition of the organic matter.

Original languageEnglish (US)
Pages (from-to)188-195
Number of pages8
JournalSoil Biology and Biochemistry
Volume133
DOIs
StatePublished - Jun 2019

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Soil Science

Keywords

  • Hydrologic control
  • Iron and carbon model
  • Plant uptake
  • Soil iron redox
  • Soil moisture variability

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