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Wetting-Induced Soil Carbon Dioxide Pulses in Temperate Forests and Agricultural Fields

Wetting-Induced Soil Carbon Dioxide Pulses in Temperate Forests and Agricultural Fields


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About the Book

Enhanced soil respiration due to wetting can contribute to interannual variations in ecosystem carbon balance, and affect short-term and long-term carbon sequestration. Improved knowledge on wetting effects is important particularly because of the projected increased in precipitation variability due to climate change. This study sought to enhance understanding of short-term effects of wetting on soil respiration and to estimate wetting-induced soil carbon emissions. Simulated wetting experiments were conducted in two New England forests and on Nebraska soybean fields. Laboratory incubation experiments on forest floor litters were performed to provide complementary information for our field experiments. At the forest sites, in-situ soil CO2 flux measurements showed immediate and short-lived increase in soil respiration upon wetting. Enhancement magnitude was similar at the two forests. Flux enhancement occurred mainly on plots with intact organic layer, suggesting that O horizon is the main contributor of the enhancement. Flux enhancement increased with wetting intensity and moisture increment. Flux enhancement and flux contribution by O horizon were both negatively correlated with pre-wetting soil moisture, indicating that on drier plots, flux enhancement and O horizon flux contribution is greater. Our results also allowed rough estimates of soil carbon loss during wetting. At the Nebraska soybean sites, wetting also triggered soil CO2 pulses, but enhancement magnitude was greater than that at the forest sites. On bare plots, wetting not only induced enhancement, but also produced extended duration of elevated CO2 flux, phenomena not observed on bare plots at the forest sites. This indicates that, regardless of the presence or absence of crop residues, upon mild wetting events, the soybean fields have potential to lose more soil carbon than the forest sites. Nonetheless, wetting-induced carbon loss from agricultural soils could be constrained due to anaerobic conditions commonly seen in compact agricultural soils. Flux enhancement was negatively correlated with moisture increment, suggesting that oxygen is the limiting factor for soil respiration at the soybean sites. The incubation experiments showed that moisture level did not affect temperature sensitivity of decomposition, and that substrate availability was not a limiting factor for litter decomposition as long as moisture was sufficient.


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Product Details
  • ISBN-13: 9781243716903
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 246 mm
  • Weight: 399 gr
  • ISBN-10: 1243716908
  • Publisher Date: 01 Sep 2011
  • Binding: Paperback
  • Spine Width: 12 mm
  • Width: 189 mm


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