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              <p>Tree species-richness is thought to be conducive and conversely pure dominant plots adverse to the diversity of forest flora. However, a review of the literature shows that very few studies have verified that assumption. In fact, the combination of broadleaved and conifer species is very seldom more conducive to floristic diversity than their pure conifer or broadleaved equivalent. In four forests in the Brie area, we tested the effects of species-richness versus dominant pure effects on floristic diversity. Species-richness turned out to have few significant effects whereas pure dominants did have significant effects on the species-richness of several floristic groups. In particular, it had a positive effect on the species-richness of herbaceous plants. To draw any definite conclusions on this topic, research needs to be conducted elsewhere in French forests.</p>
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              <p>La richesse en essences arborées est supposée favorable et la pureté de l'essence dominante défavorable à la diversité de la flore en forêt. Cependant, une analyse de la bibliographie montre que peu d'études l'ont vérifié. Ainsi, le mélange feuillus-résineux est-il très rarement plus favorable à la diversité floristique que le peuplement pur résineux ou feuillu correspondant. Dans quatre forêts de Brie, nous avons testé l'effet de la richesse en essences et de la pureté de l'essence dominante sur la richesse floristique. La richesse en essences est apparue avoir peu d'effets significatifs, alors que la pureté de l'essence dominante a présenté des effets significatifs sur la richesse spécifique dans plusieurs groupes floristiques avec, en particulier, un effet positif sur la richesse floristique des herbacées. Pour essayer de conclure nettement sur ce thème, des études doivent donc être menées sur d'autres forêts françaises.</p>
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