29 - Plant environments-v2

29 - Plant environments-v2 - Fact of the day 125 Large...

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http://seagranhttt.uaf.edu/news/05ASJ/Science_Arctic_Lakes.pdf http://www.livescience.com/environment/050603_lakes_gone.html 125 Large Northern Lakes Noted to have Disappeared Fact of the day
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Water uptake and passage in the root Soil water Waterproof barrier to apoplastic movement; Regulates ion transport
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How water rises in plant Xylem cells maintain water in capillaries; Water conducted upward through xylem Lowest potential pressure in air Highest potential pressure in soil
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In Phloem, sugar flows from Source to Sink Leaf Root Growing bud
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Flow of phloem sap • Water potential gradient set up between source and sink • Bulk flow in phloem from source to sink
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Nutrients in soils • Nutrients, such as nitrogen, potassium, and water play an important role in the distribution and abundance of organisms N P
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Soils • Soil: complex loose terrestrial surface material in which plants grow • composed of; – Weathered fragments – Water – Dissolved minerals and organic compounds
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Soils • Macronutrients: elements required in the greatest amount – Nitrogen, phosphorus, sulfur, potassium, calcium, magnesium, and iron. – Other nutrients are needed in trace amounts
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Soils Elements in the soil vs. those that accumulate in vegetation
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• Teeming with life, mainly microscopic – organisms die, decay • bacteria and fungi
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This note was uploaded on 12/16/2011 for the course BIO 201 taught by Professor True during the Fall '08 term at SUNY Stony Brook.

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29 - Plant environments-v2 - Fact of the day 125 Large...

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