Author: Thibault Lambert
Publisher:
ISBN: 9782914375887
Category :
Languages : en
Pages : 153

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Author: Anthony Gauthier
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Les matières organiques dissoutes (MOD) constituent un paramètre essentiel de la qualité des milieux aquatiques et du fonctionnement des écosystèmes. La production de MOD dans les sols et leur devenir lors de leur transfert dans les bassins versants ont été étudiés au cours d’expérimentation réalisées à différentes échelles, du microcosme de sol au bassin versant, à l’aide du traçage isotopique des formes stables du carbone (13C). À l'échelle du bassin versant, nous avons mis en évidence le rôle des zones humides dans la formation du carbone organique dissous (COD). Lors d’évènement de crues nous avons néanmoins observé la mobilisation de plusieurs sources de COD pour alimenter les rivières. Au cours d’expérimentations de laboratoire, nous avons démontré que le type d’essence forestière influence le devenir du carbone extractible à l’eau contenu dans les sols. La substitution de forêts natives par des plantations de Douglas diminue les apports de carbone dans le sol et les vitesses de minéralisation du carbone organique du sol lesquelles dépendent aussi de la température. Pourtant, l’évolution du carbone extractible à l’eau des sols de forêt, conditionnée par le type d’essences, ne dépend ni des vitesses de minéralisation du carbone ni de la température. Nous avons donc conclu que dans les horizons de surface des sols forestiers, le COD ne provient pas principalement de la décomposition de la matière organique du sol mais de la végétation par l’intermédiaire des lessivats de litière.

Author:
Publisher:
ISBN: 9782914375641
Category :
Languages : en
Pages : 208

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Author: Deryle Lonsdale
Publisher: Routledge
ISBN: 1135973504
Category : Foreign Language Study
Languages : en
Pages : 974

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A Frequency Dictionary of French is an invaluable tool for all learners of French, providing a list of the 5000 most frequently used words in the language. Based on a 23-million-word corpus of French which includes written and spoken material both from France and overseas, this dictionary provides the user with detailed information for each of the 5000 entries, including English equivalents, a sample sentence, its English translation, usage statistics, and an indication of register variation. Users can access the top 5000 words either through the main frequency listing or through an alphabetical index. Throughout the frequency listing there are thematically-organized lists of the top words from a variety of key topics such as sports, weather, clothing, and family terms. An engaging and highly useful resource, the Frequency Dictionary of French will enable students of all levels to get the most out of their study of French vocabulary. Former CD content is now available to access at www.routledge.com/9780415775311 as support material. Designed for use by corpus and computational linguists it provides the full text in a format that researchers can process and turn into suitable lists for their own research work. Deryle Lonsdale is Associate Professor in the Linguistics and English Language Department at Brigham Young University (Provo, Utah). Yvon Le Bras is Associate Professor of French and Department Chair of the French and Italian Department at Brigham Young University (Provo, Utah).

Author: T. Henry Blackburn
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 488

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Nitrogen discharge to the coastal environment has been increasing, posing the threat of accelerated eutrofication. Considerable research has been conducted in recent years to examine the impact of the nitrogen loading in coastal ecosystems. Based on proceedings from a SCOPE symposium held at the University of Aarhus in July of 1985, this volume covers a variety of up-to-date developments in research on nitrogen cycling in coastal marine environments. Topics include the role of nitrogen in algal productivity, regeneration of nutrients in the water column and the sediments, and the flow of nitrogen in coastal ecosystems.

Author: Paul-André Calatayud
Publisher: IRD Editions
ISBN: 9782709916141
Category : Cassava
Languages : en
Pages : 116

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Most basic information on plant-mealybug interactions during the last decade has come from research on the cassava Manihot esculenta Crantz (Euphorbiaceae) system with two mealybug species, namely Phenacoccus manihoti Matile-Ferrero and Phenacoccus herreni Cox and Williams (Sternorrhyncha: Pseudococcidae). Both these insects cause severe damage to cassava in Africa and South America, respectively. This book reviews these interactions (plant selection by the insects, nutritional requirements

Author: Jerome O. Nriagu
Publisher: Elsevier-North-Holland Biomedical Press
ISBN:
Category : Medical
Languages : en
Pages : 720

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Author: Alfred Frank Bartsch
Publisher:
ISBN:
Category : Eutrophication
Languages : en
Pages : 60

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Author: Jean-Jacques Aubert
Publisher:
ISBN:
Category : History
Languages : en
Pages : 548

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"Business Managers in Ancient Rome deals with the law of indirect agency in the classical period and explores the technical aspects and historical development of a set of praetorian remedies (actiones adiecticiae qualitatis), their role in the economy and their incidence on the society." "By bringing together various kinds of evidence (legal, literary, epigraphical, archaeological, numismatic, comparative, and accessorily, papyrological), this study attempts to sketch the social and economic history of an important chapter of the Roman law of obligations."--BOOK JACKET.Title Summary field provided by Blackwell North America, Inc. All Rights Reserved

Author: tucson Symposium on the use of analog and digital computers in hydrology
Publisher:
ISBN:
Category :
Languages : en
Pages :

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