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7 Cards in this Set
- Front
- Back
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Biotic plant interactions |
•Species signaling and •recognition •Allelopathy •Mychorrhiza •Biological Nitrogen Fixation •Insect pollination •Pathogens •Plant species |
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Two forms of competition |
1) Exploitation: Indirect interaction associated with resource depletion.(water absorption and light interception) 2) Interference: direct interaction that limits the access to resources. (Allelopathic effects) |
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Two principles that describe the outcome of competitive interactions |
1) Law of constant yield: Indicates variation in plant density is largely compensated by variation in growth of individual plants. 2) Thinning law: Relationship between mean plant mass and total population density. |
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Allelopathy |
Includes any direct or indirect, harmful or beneficial effect by one plant. |
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Mycorrhizae effect |
•Fungi associated with vascular plant roots. •Play a role in interspecific competition. •They directly improve: 1) Plant performance 2) enhance mineral nutrition 3) Improves plant water status 4) Suppress root pathogens 1) Plant performance 2) enhance mineral nutrition 3) Improves plant water status4) Suppress root pathogens5) Suppress plant diseases6) Contributes to improved soil texture and aggregation 5) Suppress plant diseases 6) Contributes to improved soil texture and aggregation |
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Symbiotic Nitrogen Fixation |
•Important plant microbial interaction. •Rhizobia bacteria infect legume plants •legumes provide energy and oxygen and protection. •bacteria provide the enzyme system for fixation •Nitrogen fixation is reduced by light competition, defoliation and increased availability of soil Nitrogen. |
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Grazing Resistance |
Mechanisms that enable plants to survive in a grazed ecosystem. |
