Transcript Interference competition (Allelopathy)

REWM 3500
Rangeland Plant Ecophysiology
Monday, November 9, 2009
Plant-plant interactions
Facilitation and Competition
Models of resource competition
Can plants sense presence of neighbors?
What traits confer competitive success in arid and semiarid rangeland?
Interference competition (Allelopathy)
Biotic interactions
Neutral
Mutualism
Commensalism
Amensalism
Parasitism
Herbivory
Predation
Competition
response
sp-A
sp-B
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Facilitation of
neighboring plants
Facilitation of Agave by
Hilaria
Facilitation of neighboring plants
Hydraulic lift in Artemisia improves growth of neighbor plants
Tilman (1988) model of
resource competition
Direct evidence of resource competition
Can plants sense
presence of other plants?
Root-root communication and interference
Mahall and Callaway 1991
Root-root communication and interference
Larrea roots growing into
Ambrosia roots
Ambrosia roots growing
into Larrea roots
Mahall and Callaway 1991
Allelopathic compound released to soil may
account for root-root interference
Allelopathic compound leached from
leaves of black walnut (Juglans niger)
Bais et al. (2003) - Allelopathy in spotted knapweed
(Centaurea maculosa)
Terms and concepts to know:
facilitation
parasitism
neutral interactions
competition
nurse plant
resource competition
interference competition (Allelopathy)
relative growth rate
Grime and Tilman models of competition
R/FR light ratios