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Programa e Resumos - I Congresso Ibérico de Ciência do Solo 2004

Programa e Resumos - I Congresso Ibérico de Ciência do Solo 2004

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I <strong>Congresso</strong> Ibérico da Ciência <strong>do</strong> <strong>Solo</strong> – 15 a 18 <strong>de</strong> Junho <strong>de</strong> <strong>2004</strong>, Bragança, Portugal<br />

Dynamics of Microbial Biomass after a Wildfire in Forest Mediterranean<br />

Soils in Central Spain.<br />

M. T. Iglesias (1) & I. Walter (2)<br />

(1) Universidad Francisco <strong>de</strong> Vitoria, Ctra M-515 Pozuelo-Majadahonda, km 1,800 28223<br />

Pozuelo <strong>de</strong> Alarcón (Madrid) SpainTel. 917091400, ext. 473-email: m.iglesias.prof@ufv.es<br />

Corresponding author<br />

(2) Departamento MedioAmbiente. Box 8111. 28080 Madrid. Spain Tel.: 913476738; Fax:<br />

913572293.<br />

Resumo<br />

Comunicação: Painel<br />

The objective of this study was to evaluate the dynamic of biomass flush in a wildfire<br />

forest soil in Central Spain. Four soils affected by a wildfire were sampled at 0-5 cm<br />

<strong>de</strong>pth, to 2, 8, 16 and 22 months after burning. Two unburned soil samples with the<br />

same characteristics of burned soil, were used as a control.<br />

The change over time of fire on microbial biomass was studied. Two months after<br />

burning, DOC, extractable N and P, were significantly increased in fumigated and<br />

unfumigated soils. Nevertheless these increases were short-lived and became<br />

statistically not significant after eight months. A parallel <strong>de</strong>crease below the control<br />

values of microbial N and P flush were observed after wildfire, and contrasted with a<br />

increase in microbial biomass C flush. The ten<strong>de</strong>ncy of burned soils is to return to<br />

control values within one year of the fire.<br />

– 201 –

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