The role of soil redox conditions in microbial phosphorus cycling in humid tropical forests

Avner Gross, Yang Lin, Peter K. Weber, Jennifer Pett-Ridge, Whendee L. Silver

Research output: Contribution to journalArticlepeer-review

Abstract

Humid tropical forests are among the most productive ecosystems globally, yet they often occur on soils with high phosphorus (P) sorption capacity, lowering P availability to biota. Short-term anoxic events are thought to release sorbed P and enhance its acquisition by soil microbes. However, the actual effects of anoxic conditions on microbial P acquisition in humid tropical forest soils are surprisingly poorly studied. We used laboratory incubations of bulk soils, NanoSIMS analysis of single microbial cells, and landscape-scale measurements in the Luquillo Experimental Forest (LEF), Puerto Rico to test the hypothesis that anoxic conditions increase microbial P acquisition in humid tropical forests. In laboratory and field experiments, we found that microbial P uptake generally decreased under anoxic conditions, leading to high microbial carbon (C) to P ratios in anoxic soils. The decreased P acquisition under anoxic conditions was correlated with lower microbial C use efficiency (CUE), an index of microbial energy transfer in ecosystems. Phosphorus amendments to anoxic soils led to increased microbial P uptake and higher CUE suggesting that microbes were less able to access and utilize P under natural low redox conditions. Under oxic conditions, microbial C:P ratios and CUE did not respond to changes in substrate stoichiometry. These results challenge the existing paradigm by showing that anoxic conditions can decrease microbial P uptake and ultimately constrain microbial CUE. Our findings indicate that soil redox conditions tightly couple soil P and C cycles and advance our understanding of controls on P cycling in humid tropical forest ecosystems.

Original languageAmerican English
Article numbere02928
JournalEcology
Volume101
Issue number2
DOIs
StatePublished - 1 Feb 2020

Keywords

  • NanoSIMS
  • anoxic conditions
  • carbon use efficiency
  • humid tropical ecosystem
  • microbial stoichiometry
  • phosphorus cycle
  • soil redox

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

Fingerprint

Dive into the research topics of 'The role of soil redox conditions in microbial phosphorus cycling in humid tropical forests'. Together they form a unique fingerprint.

Cite this