Monitoring of the Phytosanitary State of Navarra's Forests, Spain.
作者： J. M. Santamaría , A. Martín
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摘要: Between 1988 and 1993 six surveys on the condition of forests in Navarra (North Spain) were carried out. The results, relating to 408 trees 17 sampling points, showed that overall percentage damaged increased from 2.86% 18.6% 1993, which indicates a general large-scale deterioration forest condition. Among most common groups trees, severely affected species Quercus faginea, robur Pinus sylvestris. Furthermore, it was observed defoliation discoloration processes did not occur randomly between stand but one year (1992) more predisposed suffer damage next (1993).
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