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• W1972670902 abstract "This paper examines 20th-century environmental change in the subhumid southwestern Canadian Plains, specifically in relation to the dominant agricultural landscape and to the climate of the past millennium as reconstructed from proxy data. Anthropogenic landscape change in the last century has been dominated by the conversion of grasslands to ranchland and cropland. This has heightened landscape vulnerability to climatic fluctuations, especially drought. Instrumental climate records, extending back to the 1880s, highlight the variability of precipitation in this region. Proxy environmental records, derived from lake cores and tree-ring analysis, extend this picture into the last millennium and show that drought has been a recurring theme of the Prairie climate. Tree-ring records suggest that some droughts in the last millennium may have exceeded in severity any in the instrumental record. The sustainability of Prairie agriculture depends on adaptation to the amplitudes of climatic change and variability evident in these proxy records.Dans cet article nous examinons les changements environnementaux qui sont survenus pendant le 20eme siecle dans les plaines canadiennes seches du sud-ouest, specifiquement par rapport au paysage agricole dominant et au climat du dernier millenaire qui a ete determinea partir de donnees de procuration. La transformation des prairies en ranchland et cropland est le changement du paysage le plus important dont l'homme est responsable, pour le dernier siecle. A cause de ce changement, le paysage est plus vulnerable aux fluctuations climatiques - a la secheresse en particulier. Les enregistrements instrumentaux de climat, qui reculent jusqu'aux annees 1880, mettent en evidence la variabilite des precipitations dans cette region. Les enregistrements environnementaux de procuration, derives d'echantillons pris dans les lacs et de la dendroanalyse, etendent cette image dans le dernier millenaire et prouvent que le theme de la secheresse est apparu souvent dans les analyses du climat du prairie. Les enregistrements de boucles d'arbre suggerent que, dans le dernier millenaire il y avait des secheresses qui etaient peut-etre si severes que les instruments n'ont pas pu les enregistrer. Si l'agriculture veut survivre comme entreprise dans les prairies, il faudra qu'elle s'adapte aux amplitudes de changement et de variabilite du climat qui ont ete constatees dans les donnees de procuration." @default.
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• W1972670902 date "1998-12-01" @default.
• W1972670902 modified "2023-09-26" @default.
• W1972670902 title "RECENT ENVIRONMENTAL CHANGE IN THE SOUTHWESTERN CANADIAN PLAINS" @default.
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• W1972670902 doi "https://doi.org/10.1111/j.1541-0064.1998.tb01350.x" @default.
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