Abstract.To understand the use of Chromolaena odorata in different agricultural systems and ecosystems, findings of several scientific studies conducted in different areas have been assessed in this review paper. Some authors considered C. odorata as a serious weed because of its ability: to regenerate and colonize uninvaded areas; to be a threat to some ecosystems and environment; to reduce the biodiversity of grasslands, savannahs and forests; and to be a considerable problem in commercial tree plantations as it suppresses the growth of young pine and eucalypt trees. Others argued that the species may be considered as a beneficial fallow plant rather than a weed, because it may be considered as a welcome plant rather than a weed in some agricultural systems, when considering the expected properties of species for fallow improvement. The following are the main reasons why C. odorata is considered as a fallow because of it ability: to be a nutrient sink and its potential benefit to the crop as regular source of organic matter and nutrients after slashing; to have a beneficial effect on exchangeable K concentration; to be used as green manure; to be better adapted as a fallow plant on acidic soils than some leguminous.
Abstract. The world's biodiversity and ecosystems are threatened by the invasion of alien plant species. They have been found to impact the structure in function of ecosystems in temperate, tropical and subtropical areas (Holm et al., 1977;Pysek, 1997;Byers et al., 2002;Ehrenfeld, 2003). We reviewed studies to summarize the impact of four plant species invasions on European ecosystems: Solidago gigantea, Prunus serotina, Heracleum mantegazzianum and Fallopia japonica, because they are amongst a number of invasive species which have spread over the last centuries, and are still increasing their range in Europe. They cause negative impacts on both native biodiversity and ecosystem functioning (including productivity, nutrient cycling and soil organic matter dynamics).
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