Ecology: Chapter 21: Ecosystem Energetics
Energy Fixed in the Process of Photosynthesis is Primary Production
Gross primary production
Net primary production
Ocean NPP 2007
Temperature, Water & Nutrients Control Primary Production in Terrestrial Ecosystems
NPP for a variety of terrestrial ecosystems
1000 mm = 40 inches 30oC = 86oF
Relationship between NPP and the length of growing season.
Each dot represents one forest site.
EVT depends on both precipitation and temperature
Relationship between NPP and nutrient availability
Different forest ecosystems, Blackhawk Island, WI
Abbreviations refer to the dominant tree species in each stand:
Relationship between aboveground NPP and nitrogen availability
Temperature, Light & Nutrients Control Primary Production in Aquatic Ecosystems
Primary production in the world's oceans.
Energy Allocation and Plant Life-Form Influence Primary Production
Relationship between standing biomass and NPP.
Primary Production Varies With Time
Changes in proportions of biomass for white oak trees as trees age.
Ecosystems Have Two major Food Chains
Orange Arrows = energy flow associated with ingestion
Brown Arrows = dead organic matter/waste products
R = respiration