Influence Of Fire Recurrence On CO2 Sink And
Soil Composition In Holm Oak Forests
Author(s)
F. R. López-Serrano, J. De las Heras, D. Moya,
F. A. García-Morote & E. Rubio
Abstract
During the last few decades thousands of hectares of Holm oak (Quercus ilex
subsp. ballota) forests have burned in Spain due to the increase in the number of
large forest fires. This species is able to resprout after disturbance, so a high
density coppice stand regenerates naturally after a fire. In SE Spain, a wildfire
affected a Holm oak forest in August, 1993, and another fire occurred in July,
2001. A study was carried out to assess the influence of fire recurrence on the
CO2 sink capacity of this forest but also the influence on the soil composition.
For this research, several plots were defined and set in the burned area. All
resprouts within plots were measured (diameter at 30 cm above ground) and
selected individuals were subjected to destructive tests to estimate biomass
(above and below ground). By applying allometric relationships to all resprouts,
the biomass of the different plots was estimated. To estimate the annual CO2 sink
in the study plots, the dry biomass obtained was multiplied by determined
conversion factors. A large resprouting event occurred 3 months after the last fire
and the estimated biomass suggested that recurrent fires could be negatively
related to the vitality of the Holm oak shoots. Results also showed the important
contribution of these coppice forests as a CO2 sink. However, fire recurrence
decreased the presence of the main soil components and it was not significantly
affected by treatments. These results allowed us to establish that the CO2 sink
capacity is negatively affected by successive fires. This tendency could be
changed by silvicultural treatments aimed to improve growth, vitality and
adequate reproduction. Management models of coppice Holm oak stands are
needed in order to improve CO2 sink capacity.
Keywords: resprouting, quercus ilex, coppice forest.
Keywords
resprouting, quercus ilex, coppice forest.
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