# Net primary production is The rate at which plant material Is PRODUCED, before consumed or death Herbivores above ground Detritus Decomposers below ground.

## Presentation on theme: "Net primary production is The rate at which plant material Is PRODUCED, before consumed or death Herbivores above ground Detritus Decomposers below ground."— Presentation transcript:

Net primary production is The rate at which plant material Is PRODUCED, before consumed or death Herbivores above ground Detritus Decomposers below ground Plants Atmospheric CO 2 7 5 6 4 3 2 1 Fluxes 1) Gross photosynthesis 2) Plant respiration 3) Decomposer respiration 4) Herbivory 5) Herbivore death and defecation 6) Plant death 7) Decomposer consumption

Net ECOSYSTEM production is the rate at which material accumulates in the WHOLE BOX It’s the rate of change of ALL biomass in the ecosystem: photosynthesis minus ALL respiration

Clicker Question 1: Jose has just clearcut his lodgepole pine forest to minimize fire risk. He learns that there are things he can do to make money from forestry practices related to carbon credits, but he doesn’t know whether he will make money from doing this. For carbon credits, Jose should be focusing on –1. Net primary production –2. Net ecosystem production

Now… The first 30 years probably takes the following trend following his cutting:

Time of cutting Biomass (kg/m2) 300000 0 time Time of cutting Biomass (kg/m2) 30000 0 time Time of cutting Biomass (kg/m2) 0 -30000 time Time of cutting Biomass (g/m2) 0 -30000 time 30000 1. 2. 3. 4. 2

Time of cutting NPP (g/m2/y) 1000 0 time Time of cutting NPP (g/m2/y) 1000 0 time Time of cutting NPP (g/m2/y) 0 -1000 time Time of cutting NPP (g/m2/y) 0 -1000 time 1000 1. 2. 3. 4. 3

Time of cutting NEP (g/m2/y) 1000 0 time Time of cutting NEP (g/m2/y) 1000 0 time Time of cutting NEP (g/m2/y) 0 -1000 time Time of cutting NEP (g/m2/y) 0 -1000 time 1000 1.2. 3. 4. 4

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