Lecture 9 Flashcards
Pressure potential (p)
Negative (water getting vacuumed)
Positive (water getting pushed)
Solute potential (s)
Value is always negative
Water moves towards higher [solute]
Matric Pressure (m)
Pressure from Adhesion and Cohesion
Tubes i.e xylem cells
Water Vapour Pressure (h)
Increases as water vapour in the air increases
Maximum at warm, dry air
Dryer air = higher (more negative) vapour pressure potential = lower RH
Gravity potential (g)
Straight forward
Higher (more negative) value as height increases
Water potential in trees (plants)
Higher to lower water potential (less to more negative) from roots to leaves
Water potential gets more negative as you go up the tree
What’s Autotrophy
Makes their own complex carbohydrates from inorganic Carbon sources
Photosynthesis, Chemosynthesis
What’s Heterotrophy
Uses organic sources of Carbon to derive energy
What trophic strategies do fungi and animals use
Exclusively heterotrophs
What’s organisms are the most diverse in trophy strategies
Prokaryotes (Bacteria and Archaea)
What species are chemosynthesizers
Only found in prokaryotes
Photosynthetically active radiation (PAR)
Blue and red light are absorbed the most by the plant pigment chlorophyll
What affects the quality and quantity of light in photosynthetic rates?
Latitude (angle of solar radiation)
Clouds
Landscape features
Position of the plant relative to other plants
Depth in aquatic systems
What is Light Partitioning in Forests
Trees are adapted to varying levels of PAR
Lights on Water Depth
Red light doesn’t reach deep levels (prob b/c of low energy) - organisms nearer the surface are appear green b/c red absorbed
Blue light reaches the deepest - red reflected (blue absorbed)
