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VEGETATION --- EROSION --- GENIE BIOLOGIQUE --- PIEGEAGE DE SEDIMENTS --- MARNES --- RAVINE

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Aliment indispensable à la vie, l’eau destinée à la consommation humaine nécessite une excellente qualité physico-chimique et microbiologique. Cette étude a envisagé de déterminer la qualité physico-chimique et microbiologique de l’eau consommée par la population du sous-bassin versant de Ravine Diable en analysant les paramètres suivants : pH, température, couleur, odeur, conductivité électrique, calcium, magnésium, manganèse, fer, chlorures, fluorures, sodium, aluminium, cuivre, zinc, arsenic, nitrites, nitrates, sulfates, carbonates, bicarbonates, dureté et alcalinité, coliformes fécaux et totaux, Escherichia coli et numération des germes. Le choix des échantillons d’eau analysés a été reposé sur un certain nombre de facteurs de risques et sur l’importance relative des populations utilisatrices. Ces derniers ont été identifiés via des enquêtes et observations de terrain. Les résultats ont montré que la quasi-totalité de ces paramètres physico-chimiques sont conformes aux normes de l’OMS et de l’Union Européenne. La classification hydrochimique des eaux à partir du diagramme de Piper a montré qu’elles sont principalement bicarbonatées calciques, avec une minéralisation qui varie de faible à modérément accentuée. Par contre, sur le plan microbiologique, ils ont montré que les eaux de source, de la rivière et de la citerne Berné contiennent tous les germes susmentionnés à des concentrations supérieures aux normes. À l’instar de l’échantillon témoin, les citernes Kolo et Neyop ne sont conformes qu’en Escherichia coli et coliformes fécaux. Les activités humaines exercent une influence non négligeable sur la qualité des ressources en eau du sous-bassin. La consommation de ces eaux sans traitement préalable constitue un risque pour la santé des populations. Des mesures urgentes s’avèrent donc nécessaires pour prévenir les populations des risques de maladies hydriques.

Eau destinee a la consommation humaine, sous-bassin versant, Ravine Diable, parametres physico-chimiques, parametres microbiologiques --- Sciences du vivant > Sciences de l'environnement & écologie

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"An old-growth forest is one that has formed naturally over a long period of time with little or no disturbance from humankind. They are increasingly rare and largely misunderstood. In this book, Joan Maloof, the director of the Old-Growth Forest Network, makes a heartfelt and passionate case for their importance. This evocative and accessible narrative defines old-growth and provides a brief history of forests. It offers a rare view into how the life-forms in an ancient, undisturbed forest-including not only its majestic trees but also its insects, plant life, fungi, and mammals-differ from the life-forms in a forest manipulated by humans. What emerges is a portrait of a beautiful, intricate, and fragile ecosystem that now exists only in scattered fragments. Black-and-white illustrations by Andrew Joslin help clarify scientific concepts and capture the beauty of ancient trees"-- "An impassioned case for the importance of ancient forests and their preservation. Standing in an old-growth forest, you can instinctively sense the ways it is different from forests shaped by humans. These ancient, undisturbed ecosystems are increasingly rare and largely misunderstood. Nature's Temples explores the science and alchemy of old-growth forests and makes a compelling case for their protection. Many foresters are proponents of forest management while ecologists and conservation biologists believe that the healthiest forests are those we leave alone. Joan Maloof brings together the scientific data we have about old-growth forests, drawing on diverse fields of study to explain the ecological differences among forests of various ages. She describes the life forms and relationships that make old-growth forests unique-from salamanders and micro-snails to plants that communicate through fungi-and reveals why human attempts to manage forests can never replicate nature's sublime handiwork. Maloof invites you to discover the power of these fragile realms that are so inextricably connected to our planet, our fellow species, and our spirits. With drawings by Andrew Joslin that illustrate scientific concepts and capture the remarkable beauty of ancient trees, this revised and expanded edition of Nature's Temples sheds new light on the special role forests play in removing carbon from the atmosphere and shares what we know about the interplay between wildfires and ancient forests"--

Old growth forests. --- Biodiversity. --- NATURE / Ecology. --- NATURE / Plants / Trees. --- Ancient forests --- Virgin forests --- Forests and forestry --- Biological diversification --- Biological diversity --- Biotic diversity --- Diversification, Biological --- Diversity, Biological --- Biology --- Biocomplexity --- Ecological heterogeneity --- Numbers of species --- Adirondack Mountains. --- Aggression. --- Air pollution. --- American chestnut. --- Anecdotal evidence. --- Anishinaabe. --- Bark beetle. --- Bat. --- Bathing. --- Baxter State Park. --- Behalf. --- Bernie Krause. --- Bowhead whale. --- Calculation. --- Chesapeake Bay. --- Citizen science. --- Climate change. --- Climate pattern. --- Cloud cover. --- Coarse woody debris. --- Coral bleaching. --- Decomposer. --- Deep sea. --- Deforestation. --- Devonian. --- Dry season. --- Ecosystem. --- Fertility. --- Fisherman. --- Flood. --- Food. --- Forest Ecology and Management. --- Forest floor. --- Forest. --- Forestry. --- Fungus. --- Germination. --- Gray fox. --- Great Lakes region. --- Great Smoky Mountains. --- Groundwater. --- Guitar. --- Hearing range. --- Ice Glen. --- Ice age. --- Immune system. --- Indicator species. --- Insect. --- Ivory-billed woodpecker. --- Jagadish Chandra Bose. --- Journal of Mammalogy. --- Juvenile fish. --- Laser rangefinder. --- Lichen. --- Lichenology. --- Longevity. --- Low-pressure area. --- Machine learning. --- Measurement. --- Metre per second. --- Mink. --- Newspaper. --- Northwest Forest Plan. --- Nutrient. --- Old Forest. --- Old-growth forest. --- Oregon Coast Range. --- Organic compound. --- Organism. --- Phosphorus. --- Photosynthesis. --- Physiology. --- Plant evolution. --- Podocnemis. --- Precipitation. --- Rain. --- Ravine. --- Red squirrel. --- Scientist. --- Singing. --- Social complexity. --- Soil. --- Soundscape. --- Species. --- Spectrogram. --- Stoma. --- Swainson's thrush. --- Temperate broadleaf and mixed forest. --- The Botanist. --- Thuja occidentalis. --- Tree height measurement. --- Tsuga. --- Underwater. --- Urban heat island. --- Vernal pool. --- Vibration. --- Website. --- Wildlife. --- lungwort.