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. 2007. SWAT-predicted influence of different landscape and cropping system alterations on phosphorus mobility within the Pike River watershed of south-western Québec. Can. J. Soil Sci. 87: [329][330][331][332][333][334][335][336][337][338][339][340][341][342][343][344]. An agreement between the governments of the province of Québec and the State of Vermont calls for a 41% decrease in phosphorus (P) loads reaching Missisquoi Bay, the northern portion of Lake Champlain. The agreement particularly targets the agricultural sector, since 80% of non-point source P inputs to the bay are associated with cultivated lands. In order to identify sustainable cropping practices likely to help meet the target P loads, the SWAT (soil and water assessment tool) model was employed to assess hydrological performance, erosion processes and P mobility on the bay's principal Québec P contributing tributary, the 630 km 2 Pike River watershed. Strong in-watershed spatial clustering of vulnerability to non-point source exports highlights the need for targeted implementation of sustainable agricultural practices and soil conservation works to derive the reduction in P loads. Planting cover crops over the 10% most vulnerable lands would result in roughly a 21% drop in overall P exports at the watershed outlet, whereas the same 10% randomly distributed over the watershed would only contribute to a 6% drop in P exports. The study of different field-scale management scenarios indicated that achieving the targeted 41% reduction in P exports would require the widespread (half the land devoted to annual crops) implementation of sustainable cropping practices, and the conversion of a specific 10% of the territory to either cover crops or permanent prairie land. Meeting the P target-loads would require additional investments in the protection of floodplains and riparian strips, the targeted construction of runoff-control structures, and the rapid soil incorporation of manures on lands dedicated to annual crops.Key words: Soil and water assessment tool, modelling, sediment, phosphorus, cropping system, scenario, best agricultural management practices Michaud, A. R., Beaudin, I., Deslandes, J., Bonn, F. et Madramootoo, C. A. 2007. Modélisation de l'influence du paysage et des systèmes culturaux alternatifs sur la mobilité du phosphore dans le basin versant de la rivière aux Brochets, Québec. Can. J. Soil Sci. 87: 329-344. La réduction de 41 % des flux de phosphore à la baie Missisquoi, portion septentrionale du lac Champlain, a fait l'objet d'une entente entre les gouvernements de la province de Québec et de l'état du Vermont. L'entente interpelle particulièrement le secteur agricole, puisque 80 % des apports diffus de phosphore (P) atteignant la baie y originent. À l'aide de SWAT (Soil and Water Assessment Tool), une modélisation du fonctionnement hydrologique, des processus d'érosion et de la mobilité du P a été réalisée à l'échelle du bassin versant de la rivière aux Brochets (630 km 2 ), principal contributeur de P à la baie en territoire québ...

The children of adolescent mothers are among those presenting the highest level of psychosocial risk, compromising their socio-emotional development on a number of levels. Several intervention strategies have been designed to address some of the problems that characterize these mother-infant dyads. While these strategies have proven to be beneficial to young mothers, relatively little impact has been found on the level of infant and child development. The purpose of this article is to address the issue of intervention aimed at adolescent mothers and their infant, and underline that the relational dimension, while absent from most intervention programs, is necessary to our understanding of the problems presented by these dyads. An intervention program, currently undergoing evaluation, is described having as a main objective the improvement of the early mother-infant relationship. Attachment theory is presented as an organizing construct. Characteristics of the intervention, as well as the evaluation strategy, are described

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