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PLANTS!! Presented by Ashwana Fricker How do they Interact?

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Presentation on theme: "PLANTS!! Presented by Ashwana Fricker How do they Interact?"— Presentation transcript:

1 PLANTS!! Presented by Ashwana Fricker How do they Interact?

2 Background Grass: A monocotyledenous green plant in the family Poacaea Forb: Any non-woody flowering plant that is not a grass

3 Background Facilitative (+/+) –Soil Improvement –Structure –Deter Predators –Attract Pollinators Competitive (-/-) –Water –Nutrients (ex. Nitrogen) –Sunlight Commensalistic (+/0) –Plant secretions Grass: A monocotyledenous green plant in the family Poacaea Forb: Any non-woody flowering plant that is not a grass

4 Competition: An Argument For There is an increase in nutrients and water infiltration beneath plant canopy, suggesting an increase in the number of forbs in grass clumps

5 Commensalism: An Argument for C4 Photosynthesis in Blue and Black Grama suggests possible C3 photosynthesis in forbs

6 Facilitation: An Argument For There may be nutrient retention by forbs –Decreases nutrient leaching (benefits the grasses)

7 The Question What type of relationship? –Competition (work against each other) –Commensalism (one works for the other) –Facilitation (work with each other)

8 Methods Quarter meter plots- randomly tossed in Black Grama, Blue Grama, and Ranchland –Veg Surveys: Grass Area - quad Forb Type Forb Area Forb Position

9 Results

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12 Methods Grasses were clipped in order to determine whether short- term grazing had an effect on forb growth –10 cm radius –Clipped to the base –2 species: caesalpenia drepanocarpa macheranthera pinnatifida

13 Results

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15 Synopsis There is no strong correlation between grazing and forb growth in a season, but long term data shows that there is an increase in forb number when the grass cover decreases

16 References Callaway, R., Walker, L.; Ecology (1997); Competition and Facilitation: A Synthetic Approach to Interactions in Plant Communities; pp Kieft, T., White, C., Loftin, S., Aguilar, R., Craig, J., Skaar, D Temporal Dynamics in Soil Carbon and Nitrogen Resources at a Grassland- Shrubland Ecotone. Ecosystems. p Bhark, E., Small E Association between Plant Canopies and the Spatial Patterns of Infiltration in Shrubland and Grassland of the Chihuahuan Desert, New Mexico. Ecosystems. p

17 Thanks to… Sevilleta LTER Fish and Wildlife Scott Collins Jennifer Johnson The Friggens Michell With help from… Fred Whiteman Andrew Rominger Caitlin Smith Brenda Nieto Alex Benhumea Tierney Adamson


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