HR: 0800h
AN: B31B-07    [Abstracts]
TI: Fire as a Factor of Variation of Soil Respiration in Amazonia of Peru
AU: * Suarez, L
EM: doctorozono@yahoo.com
AF: Universidad Nacional Agraria La Molina, Av. La Molina s/n La Molina, Lima, Lim 064, Peru
AU: Kruijt, B
EM: bart.kruijt@wur.nl
AF: ALTERRA Wageningen University and Research Centre, PO box 47 6700 AA Wageningen The Netherlands street address: Building 403, Duivendaal 2, Wageningen, WAG , Netherlands
AB: Severe changes are affecting the role of Amazonia in the Earth system. One of these possible effects could be the modification of the relevance of soil in the carbon cycle. In this sense, fire is an important factor for mobilizing C from the soil to the atmosphere, mainly as CO2. This could have an important effect in the global warming. Our proposal will evaluate the variation of the soil respiration related to the seasonality and the fire effects on soils in the Amazonia of Peru and Brasil. In experimental parcels of four locations of Peru with different vegetation cover (forest and pasture), we will measure soil respiration along with the organic carbon and the microbial biomass of soils during campaigns of wet and dry seasons, with complementary measurements of soil temperature, water and nutrient content. Also, we will reproduce a fire experiment simulating local activity of "slash and burn" to evaluate fire effects. Measurements will be taken after the soil cooled and 1, 3, 5, 7 and 10 days after the fire. Additionally, the carbon stock of the subparcels will be evaluated. Evaluation of the variations of CO2 fluxes and the capacity of adaptation to fire and water content will be done through the comparisons of the different locations, type of soils and concentration of available N as an indicator of nutrient content.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0428 Carbon cycling (4806)
SC: Biogeosciences [B]
MN: 2007 Joint Assembly