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Niche construction by the invasive Asian knotweeds (species complex Fallopia): impact on activity, abundance and community structure of denitrifiers and nitrifiers

Abstract : Big Asian knotweeds (Fallopia spp.) are among the most invasive plant species in north-western Europe. We suggest that their success is partially explained by biological and chemical niche construction. In this paper, we explored the microbial mechanisms by which the plant modifies the nitrogen cycle. We found that Fallopia spp. decreased potential denitrification enzyme activity (DEA) by reducing soil moisture and reducing denitrifying bacteria density in the soil. The plant also reduced potential ammonia and nitrite oxydizing bacteria enzyme activities (respectively, AOEA and NOEA) in sites with high AOEA and NOEA in uninvaded situation. Modification of AOEA and NOEA were not correlated to modifications of the density of implicated bacteria. AOB and Nitrobacter-like NOB community genetic structures were significantly different in respectively two and three of the four tested sites while the genetic structure of denitrifying bacteria was not affected by invasion in none of the tested sites. Modification of nitrification and denitrification functioning in invaded soils could lead to reduced nitrogen loss from the ecosystem through nitrate leaching or volatilization of nitrous oxides and dinitrogen and could be considered as a niche construction mechanism of Fallopia.
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https://hal.archives-ouvertes.fr/halsde-00591789
Contributor : Nathalie Lyvet Connect in order to contact the contributor
Submitted on : Tuesday, May 10, 2011 - 10:45:20 AM
Last modification on : Tuesday, May 24, 2022 - 2:06:02 PM

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Nicolas Dassonville, Nadine Guillaumaud, Florence Piola, Pierre Meerts, Franck Poly. Niche construction by the invasive Asian knotweeds (species complex Fallopia): impact on activity, abundance and community structure of denitrifiers and nitrifiers. Biological Invasions, Springer Verlag, 2011, 13 (5), pp.1115-1133. ⟨10.1007/s10530-011-9954-5⟩. ⟨halsde-00591789⟩

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