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Ecosystems

, Volume 21, Issue 5, pp 868–885 | Cite as

Will CO2 Emissions from Drained Tropical Peatlands Decline Over Time? Links Between Soil Organic Matter Quality, Nutrients, and C Mineralization Rates

  • Erin Swails
  • Dyanna Jaye
  • Louis Verchot
  • Kristell Hergoualc’h
  • Michael Schirrmann
  • Nils Borchard
  • Novi Wahyuni
  • Deborah Lawrence
Article

Abstract

Conversion, drainage, and cultivation of tropical peatlands can change soil conditions, shifting the C balance of these systems, which is important for the global C cycle. We examined the effect of soil organic matter (SOM) quality and nutrients on CO2 production from peat decomposition using laboratory incubations of Indonesian peat soils from undrained forest in Kalimantan and drained oil palm plantations in Kalimantan and Sumatra. We found that oil palm soils had higher C/N and lower SOM quality than forest soils. Higher substrate quality and nutrient availability, particularly lower ratios of aromatic/aliphatic carbon and C/N, rather than total SOM or carbon, explained the higher rate of CO2 production by forest soils (10.80 ± 0.23 µg CO2–C g C h−1) compared to oil palm soils (5.34 ± 0.26 µg CO2–C g C h−1) from Kalimantan. These factors also explained lower rates in Sumatran oil palm (3.90 ± 0.25 µg CO2–C g C h−1). We amended peat with nitrogen (N), phosphorus (P), and glucose to further investigate observed substrate and nutrient constraints across the range of observed peat quality. Available N limited CO2 production, in unamended and amended soils. P addition raised CO2 production when substrate quality was high and initial P state was low. Glucose addition raised CO2 production in the presence of added N and P. Our results suggest that decline in SOM quality and nutrients associated with conversion may decrease substrate-driven rates of CO2 production from peat decomposition over time.

Keywords

tropical peat swamp forest oil palm plantation land-use change incubation microbial respiration Indonesia 

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  • Erin Swails
    • 1
  • Dyanna Jaye
    • 1
  • Louis Verchot
    • 2
  • Kristell Hergoualc’h
    • 3
  • Michael Schirrmann
    • 4
  • Nils Borchard
    • 3
    • 5
  • Novi Wahyuni
    • 3
  • Deborah Lawrence
    • 1
  1. 1.Department of Environmental SciencesUniversity of VirginiaCharlottesvilleUSA
  2. 2.International Center for Tropical AgricultureCaliColombia
  3. 3.Center for International Forestry ResearchBogorIndonesia
  4. 4.Leibniz Institute for Agricultural Engineering and BioeconomyPotsdamGermany
  5. 5.Institute of Geography, Soil Science/Soil EcologyRuhr-University BochumBochumGermany

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