Unit 6: Chapter 20: Production Flashcards
Energy in an ecosystem originates with…
Primary producers
Total ecosystem photosynthesis
Gross primary production (GPP)
What percentage of the ground area does a leaf of Leaf Area Index (LAI) 0.6 cover?
60%
What layer are the emergent trees at the top of a canopy?
Layer 1
NPP = GPP - R meaning
Net primary production = Gross primary production - respiratory losses
Plants allocate NPP to roots or shoots depending on requirements. What environments would warrant highest shoot and highest root allocation?
Tropical forest
Temperate grassland
NPP is a measure of ecosystem health and influences…
Carbon cycle
By remote sensing reflection ___ can be estimated on a global scale
NPP
Direct measure of CO2
Net Ecosysem Exchange (NEE)
Explain NEE = GPP - (AR + HR)
Net ecosystem exchange = Gross primary production - Auototrophic and heterotrophic respiration
NPP is constrained by what types of factors?
Physical and biotic
Global precipitation and Global temperature combo for high NPP
Moderate precipitation and high temperature
T/F On graph of GPP and R GPP is higher atm but will switch on the future
True
In aquatic ecosystems NPP is controlled primarily by…
Nutrient availability
Still water ecosystems
- Low phosphorus/nitrogen limits NPP
Lentic