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 
  
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