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2 results for “Pinus kesiya”
Pinus kesiya invasions in Tapia woodland Madagascar
<p>Pinus species are among the highly invasive species which have spread outside their plantation area after their introduction in the Southern Hemisphere. The case of <em>Pinus kesiya</em> invasion is observed in the high plateau of Madagascar, inside the sclerophyll Tapia woodland which is dominated by the endemic <em>Uapaca bojeri </em>tree species. The analysis of this invasion was carried out using 375 plots of 100 m2 each in Tapia woodland. Data on the vegetation structure, the plot characteristics and the propagule pressure were collected. We recorded a total of 740 pines distributed in 29.8% of the plots. The generalized linear model revealed that the diminution in frequency of the dominant species <em>Uapaca bojeri</em> with the increasing degree of disturbance of the fragment led to the vulnerability of the Tapia woodland to the abundance of pine. The factors explaining pine occurrence varied according to the pine life-stage. In the seedling stage, the distance of the plot from the propagule source combined with the longitudinal position of the plot explained 18% of the pine invasion success. In the sapling and adult stages, the vegetation structure was the main important factor (22% and 11% of variation explained). The frequency of <em>U. bojeri</em> and the degree of disturbance were the most important factors characterizing this vegetation structure. Based on these results, a strategy to control pine invasion in the Tapia woodland may focus on enrichment with <em>U. bojeri</em> and limitation of the plantation of <em>P. kesiya</em> in proximity.</p>
Pinus kesiya invasions in Tapia woodland Madagascar
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