1. Terrestrial
Production
Processes
Prepared by: Nikki Rose D. Dapanas
BS Environmental Science III
Prof. Magdalyna Dulay

2. Course Outline:
Chapter
1:Terrestrial
Production Processes
Overview
Gross
Primary Production (GPP)
Plant Respiration

3. Course Outline:
Chapter
1:Terrestrial
Production Processes
Net
Primary Production (NPP)
Net Ecosystem Production
Net Ecosystem Exchange

4. Overview…
The
balance between gross
primary production and
ecosystem respiration
determines the net carbon
accumulation by the biosphere.

5. Overview…
This
chapter describes
the factors that regulate
the carbon balance of
terrestrial vegetation and
ecosystems.

6. Gross Primary Production
(GPP)…
 total influx of
carbon into an
ecosystem
through the
photosynthetic
fixation of CO2

8. Plant Respiration…
provides
the
energy for a
plant
acquire
nutrients
produce &
maintain biomass.

9. Net Primary Production
(NPP)…
gross
carbon influx
discounted for plant
respiratory costs of
growth and
maintenance.
NPP= GPPRespiration(Plant)

11. 
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).

13. Net Ecosystem Production
(NEP)…
measure of the
rate of carbon
accumulation in
ecosystems

14. Net Ecosystem Production
(NEP)…
correlates
more
strongly w/time
since disturbance
than w/
environment

15. Net Ecosystem Exchange
(NEE)…
provides
a direct
measure of the
net CO2
exchange
between
ecosystems and
the atmosphere.

18. 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

19. Terrestrial Primary Production
and Global Change
climate change is
affecting the
primary production
of terrestrial
ecosystems &
conversely

20. Terrestrial Primary Production
and Global Change
ecosystems may
moderate changes in
global climate by
absorbing
anthropogenic CO2
emissions.

21. Terrestrial Primary Production
and Global Change
important
ecosystem
service
locking up carbon in
biomass that might
exist in the
atmosphere as CO2

22. Terrestrial Primary Production
and Global Change
terrestrial NPP may
be declining in
response to global
warming and
accompanying
drought

23. Terrestrial Primary Production
and Global Change
reduce
carbon
sequestration
by terrestrial
ecosystems

24. Terrestrial Primary Production
and Global Change
compromise
food
security
 disrupt the
foundation of food
webs.

25. What can we do?
Reduce
Anthropog
enic CO2
emissions
!!!

26. Thank You For
Listening…
GOD
BLESS EVERYONE
