Bio Lecture #7

Bio Lecture #7 - Bio Lecture #7 Structure affects...

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Bio Lecture #7 Structure affects properties of soil 1. Sand a. Lots of space b. Air c. H 2 O flow d. Poor retention e. Wind erosion 2. Silt a. Slippery b. Good water retention c. Water erosion 3. Clay a. Hold lots of nutrients b. Little air c. Little H 2 O flow d. Tightly bound Loams Combo of all 3 Not always proportional Soil Structure, water and air H 2 O In channels: sand Adhesion: silt, clay Moves by tension Air Cellular respiration Blocks H 2 O flow Soil and nutrient availability Soil is mostly – charged and thus 1. Attracts + nutrients 2. – Nutrients in solution 3. Charge gradient The – charged soil has several important consequences Plants must actively transport nutrients 1. Pump out H+ 2. Results in strong membrane potential 3. Cations move down their gradient 4. Anions co transported with H+ Leaching: loss of soluble nutrients, ie water run off pH of soil affects nutrient availability pH affects nutrients differently pH affect nutrient availability for many reasons 1. Survival of microorganisms
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Bio Lecture #7 - Bio Lecture #7 Structure affects...

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