Terrestrial

Production

ProcessesPrepared by: Nikki Rose D. Dapanas

BS Environmental Science III

Prof. Magdalyna Dulay

Course Outline:Chapter 1:Terrestrial

Production Processes

Overview

Gross Primary Production (GPP)

Plant Respiration

Course Outline:

Chapter 1:Terrestrial

Production Processes

Net Primary Production (NPP)

Net Ecosystem Production

Net Ecosystem Exchange

Overview…The balance between gross

primary production and

ecosystem respiration

determines the net carbon

accumulation by the biosphere.

Overview…This chapter describes

the factors that regulate

the carbon balance of

terrestrial vegetation and

ecosystems.

Gross Primary Production

(GPP)… total influx of

carbon into an

ecosystem

through the

photosynthetic

fixation of CO2

Plant Respiration…

provides the

energy for a

plant

acquire nutrients

produce &

maintain biomass.

Net Primary Production

(NPP)…

gross carbon influx

discounted for plant

respiratory costs of

growth and

maintenance.

NPP= GPP-

Respiration(Plant)

major carbon

fluxes of an

ecosystem.

Carbon as

GPP, through

photosynthesis

by plants. Roots

and aboveground

portions of

plants return

about half of this

carbon to the

atmosphere as

plant respiration

(Rplant).

Net Ecosystem Production

(NEP)…

measure of the

rate of carbon

accumulation in

ecosystems

Net Ecosystem Production

(NEP)…

correlates more

strongly w/time

since disturbance

than w/

environment

Net Ecosystem Exchange

(NEE)…provides a direct

measure of the

net CO2

exchange

between

ecosystems and

the atmosphere.

Measuring GPP and

NPP

Meteorological

towers

Satellites

Other remote

sensing devices

Figure 2: Meteorological towers like

this one located in a temperate forest

are distributed across ecosystems in

all continents except

Antarctica, providing assessments of

carbon uptake by

forest, grassland, desert, and crop

ecosystems.

Terrestrial Primary Production

and Global Change

climate change is

affecting the

primary production

of terrestrial

ecosystems &

conversely

Terrestrial Primary Production

and Global Change

ecosystems may

moderate changes in

global climate by

absorbing

anthropogenic CO2

emissions.

Terrestrial Primary Production

and Global Change

important ecosystem

service

locking up carbon in

biomass that might

exist in the

atmosphere as CO2

Terrestrial Primary Production

and Global Change

terrestrial NPP may

be declining in

response to global

warming and

accompanying

drought

Terrestrial Primary Production

and Global Change

reduce carbon

sequestration

by terrestrial

ecosystems

Terrestrial Primary Production

and Global Change

compromise food

security

disrupt the

foundation of food

webs.

What can we do?

Reduce

Anthropog

enic CO2

emissions

!!!

Thank You For

Listening…

GOD BLESS EVERYONE