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Effects of Water Table Fluctuation on Greenhouse Gas Emissions from Wetland Soils in the Peruvian Amazon

Journal Article · · Wetlands
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  1. University of Tartu (Estonia)
  2. University of Tartu (Estonia); Czech Academy of Sciences (CAS), Prague (Czech Republic). Global Change Research Institute
  3. National University of the Peruvian Amazon (Peru)
  4. Peruvian Amazon Research Institute (IIAP) (Peru)
  5. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  6. National University of the Peruvian Amazon (Peru); Max Planck Institute for Biogeochemistry, Jena (Germany)
+ Show Author Affiliations
Amazonian swamp forests remove large amounts of carbon dioxide (CO2) but produce methane (CH4). Both are important greenhouse gases (GHG). Drought and cultivation cut the CH4 emissions but may release CO2. Varying oxygen content in nitrogen-rich soil produces nitrous oxide (N2O), which is the third most important GHG. Despite the potentially tremendous changes, GHG emissions from wetland soils under different land uses and environmental conditions have rarely been compared in the Amazon. We measured environmental characteristics, and CO2, CH4 and N2O emissions from the soil surface with manual opaque chambers in three sites near Iquitos, Peru from September 2019 to March 2020: a pristine peat swamp forest, a young forest and a slash-and-burn manioc field. The manioc field showed moderate soil respiration and N2O emission. The peat swamp forests under slight water table drawdown emitted large amounts of CO2 and CH4. A heavy post-drought shower created a hot moment of N2O in the pristine swamp forest, likely produced by nitrifiers. All in all, even small changes in soil moisture can create hot moments of GHG emissions from Amazonian wetland soils, and should therefore be carefully monitored.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1992329
Journal Information:
Wetlands, Journal Name: Wetlands Journal Issue: 6 Vol. 43; ISSN 0277-5212
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

54 ENVIRONMENTAL SCIENCES
carbon dioxide
greenhouse gas
laughing gas
methane
nitrous oxide
peat
peatland
tropical
tropics