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International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

The effect of low-intensity prescribed burns in two seasons on litterfall biomass and nutrient content

J. Espinosa A B D , J. Madrigal A B , V. Pando B C , A. C. de la Cruz A , M. Guijarro A B and C. Hernando A B
+ Author Affiliations
- Author Affiliations

A INIA, Forest Research Centre, Department of Forest Dynamics and Management, Forest Fire Laboratory, Carretera Coruña km 7.5, 28040 Madrid, Spain.

B iuFOR, University Institute for Sustainable Forest Management, UVA-INIA, Avenida Madrid s/n, 34004 Palencia, Spain.

C Department of Statistics and Operational Investigation of ETSIIAA de Palencia (UVA), Avenida Madrid s/n, 34004 Palencia, Spain.

D Corresponding author. Email: espinosa.juncal@inia.es

International Journal of Wildland Fire 29(11) 1029-1041 https://doi.org/10.1071/WF19132
Submitted: 29 August 2019  Accepted: 19 July 2020   Published: 13 August 2020

Abstract

Litterfall production and composition, fall pattern and nutrient content were studied in a mixed stand of Pinus nigra and Pinus pinaster (El Pozuelo), as well as in a pure stand of Pinus nigra (Beteta) in the Cuenca Mountains in order to determine the effect of two-season prescribed burning treatments. Needles were the most abundant fraction. Pinecone fraction decreased after burning in the mixed stand and the opposite occurred in the pure stand. The inflorescence fraction showed a decrease in the spring-burned plots at El Pozuelo and Beteta. Bark, branch and miscellaneous fractions were affected mainly by meteorological events. Low-intensity prescribed burning was not found to cause significant perturbations. The perturbation was mitigated over the years. An immediate effect of prescribed burning in spring was seen at El Pozuelo and Beteta, although it was more significant for the pure stand. The effect of prescribed burning in autumn at Beteta had a delayed response. As regards nutrient contents, no differences in carbon concentrations were detected. Overall, an increasing trend in N, P, K concentrations in needles after the burning treatment was found. Calcium was not a limiting factor. Magnesium content exhibited no clear trend.

Additional keywords: Cuenca Mountains, defoliation, forest fire, Pinus nigra, Pinus pinaster, tree crown.


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