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Auteur Scott D. Russell |
Documents disponibles écrits par cet auteur (2)
Affiner la rechercheAgriculture causes nitrate fertilization of remote alpine lakes / Elizabeth J. Hundey in Nature communications, 7 (2016)
Titre : Agriculture causes nitrate fertilization of remote alpine lakes Type de document : Imprimé Auteurs : Elizabeth J. Hundey ; Scott D. Russell ; F. J. Longstaffe ; Katrina A. Moser Année de publication : 2016 Article en page(s) : 10571 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude Résumé : Humans have altered Earth’s nitrogen cycle so dramatically that reactive nitrogen (Nr) has doubled. This has increased Nr in aquatic ecosystems, which can lead to reduced water quality and ecosystem health. Apportioning sources of Nr to specific ecosystems, however, continues to be challenging, despite this knowledge being critical for mitigation and protection of water resources. Here we use Δ17O, δ18O and δ15N from Uinta Mountain (Utah, USA) snow, inflow and lake nitrate in combination with a Bayesian-based stable isotope mixing model, to show that at least 70% of nitrates in aquatic systems are anthropogenic and arrive via the atmosphere. Moreover, agricultural activities, specifically nitrate- and ammonium-based fertilizer use, are contributing most (∼60%) Nr, and data from other North American alpine lakes suggest this is a widespread phenomenon. Our findings offer a pathway towards more effective mitigation, but point to challenges in balancing food production with protection of important water resources. Lien pérenne : DOI : 10.1038/ncomms10571 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=150978
in Nature communications > 7 (2016) . - 10571Hundey, Elizabeth J., Russell, Scott D., Longstaffe, F. J., Moser, Katrina A. 2016 Agriculture causes nitrate fertilization of remote alpine lakes. Nature communications, 7: 10571.Documents numériques
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Titre : Response of an allergenic species, Ambrosia psilostachya (Asteraceae), to experimental warming and clipping: implications for public health Type de document : Imprimé Auteurs : Shiqiang Wan ; Tong Yuan ; Sarah Bowdish ; Linda Wallace ; Scott D. Russell ; Yiqi Luo Année de publication : 2002 Article en page(s) : 1843-1846 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes Mots-clés : Ambrosia psilostachya DC., 1836 Résumé : We examined the responses of an allergenic species, western ragweed (Ambrosia psilostachya DC.), to experimental warming and clipping. The experiment was conducted in a tallgrass prairie in Oklahoma, USA, between 1999 and 2001. Warming increased ragweed stems by 88% when not clipped and 46% when clipped. Clipping increased ragweed stems by 75% and 36% in the control and warmed plots, respectively. In 2001, warming resulted in a 105% increase in ragweed aboveground biomass (AGB), and the ratio of ragweed AGB to total AGB increased by 79%. Dry mass per ragweed stem in the warmed plots was 37% and 38% greater than that in the control plots in 2000 and 2001, respectively. Although warming caused no difference in pollen production per stem, total pollen production increased by 84% (P < 0.05) because there were more ragweed stems. Experimental warming significantly increased pollen diameter from 21.2 μm in the control plots to 23.9 μm in the warmed plots (a 13% increase). The results from our experiment suggest that global warming could aggravate allergic hazards and thereby jeopardize public health. Lien pérenne : DOI : 10.3732/ajb.89.11.1843 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=154118
in American Journal of Botany > 89 (11) (December 2002) . - 1843-1846Wan, Shiqiang, Yuan, Tong, Bowdish, Sarah, Wallace, Linda, Russell, Scott D., Luo, Yiqi 2002 Response of an allergenic species, Ambrosia psilostachya (Asteraceae), to experimental warming and clipping: implications for public health. American Journal of Botany, 89(11): 1843-1846.Documents numériques
article (2002)URL
