0.45 or more.
iii) Exclude the region wherethe average monthl y lowest
temperature is 15.5°C ormore andthe ratioin condition 2
in 1 year is 0.70 or more.
Fig.4 show the potential arable land distribution applied to
these conditions.
World 2 39.2 X10%ha
OECD = 11.3 X10%ha
Non-OECDS 27.8 X10ha
Fig.4 Potential Arable land Distribution Including Arable
land
4) NPP/ha in Potential Arable Land
The net primary productivity that can be obtained from
cleaning lha of forest for potential cultivation is obtained
by using the NOAA's NDVI data obtained through
Box?'s method The method for obtaining it is shown
below.
Scaled NDVI = 240- (NDVI+0.05) < 350 «it à (S)
NPP=-1467.82527 <1og(1-2.5X ScaledNDVI) - - -(6)
Scaled NDVI ! NDVI measured with NOAA (0~255)
NDVI ! normalized vegetation index
NPP ! Net primary productivity
From this result and from the area of land that can be
potentially cultivated, the amount of primary production
for each 1ha of land that can be cultivated potentially is
obtained.
5) Amount of CO2 Exhaust Due to Food
Consumption
The difference between the current food consumption and
the preceding year's food consumption is the value by
which the amount of food import and export is determined.
The amount of the CO2 exhaust due to food consumption
is obtained from the area of deforestation necessary to
supplement the lack of food.
F COZ()-ARB NPPX(F CNS(0-F. CNS(t-dt)
? 4F EXP(0-F IMP())PRD HA (v (7)
(3) Amount of CO2 Exhaust Due to Wood
Consumption
uction by Production by Region “Consumption per
Region(this year) Production last year) capital
|
Food
Deficienc
Expansion of
cultivated Land
or'stauon
Area
NPP per Area
| CO, Emission |
F1g.5. Method of predicting the amount of CO2 exhaust
with wood
CO2 exhaust from wood 1s assumed to be generated when
wood is burned for fuel and when forests are logged to .
secure logs for fuel-use and industrial-use.
1) Amountof Woodused forFuel andAmountof
Log Production for Fuel
The amount of the used of wood and the amount of log
production are obtained by using the amount of wood-use
for fuel and the amount of log production per capita and for
the enure population.
FW _CNS(1)=POP(1) x FW _CNS_CAP(1) « (8)
RW PRD(0-POP()X RW PRD CAP() - - -(9)
2) Amountof CO2 ExhaustDue to using Wood
for Fuel
When wood is burnt for fucl, the CO2 inside the tree is
released. Because according to Llieth'?!, the CO2 inside a
tree is about 45% of its weight, the expression below was
obtained.
FW _CO2(t)=0.45><FW_CNS(t) "1*4 + (10)
3) Amount of CO2 Exhaust Due to Land-use
Change
The area of deforestation is obtained from the amount of
trees that can be used from lha of deforested land”) to
secure wood for fuel -use and to secure log for industnal -use.
Using the same method in section 5.2.4 to obtain the net
primary productivity per 1ha of deforested land, the amount
of CO2 exhaust due to logging forests 1s obtained.
LU CO2(02WD. NPP
XRW PRD(0/WD VLM . + + (11)
2.5 CO2 Absorption by Afforestation
About 11,000,000ha!!?! of land has been afforested in 1980,
and in the future, itis assumed that about 1 1 ‚000,000ha!! ©)
of land will be afforested every year. Because the capacity
of CO2 fixations different depending on the fertility degree
418 Intemational Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998
of
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