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Data - Population |
Population and Land Area in China by Potential Crop Yields
According to the AEZ Model (t/ha) |
Potential
Yields |
Area
(sqkm) |
Area
(% of Total) |
Population
(millions) |
Population
(% of Total) |
Population
Density |
|
0 |
4,542,525 |
48.5 |
29 |
2.5 |
6 |
|
< 2 |
918,725 |
9.8 |
43 |
3.8 |
47 |
|
2 to 4 |
453,950 |
4.8 |
48 |
4.2 |
107 |
|
4 to 6 |
637,275 |
6.8 |
156 |
13.5 |
245 |
|
6 to 8 |
1,008,075 |
10.8 |
314 |
27.1 |
312 |
|
8 to 10 |
1,343,900 |
14.3 |
402 |
34.7 |
299 |
|
10 to 13 |
465,900 |
5.0 |
166 |
14.3 |
356 |
|
Source:
IIASA LUC-GIS |
This
table presents data on potential crop yields, based on the project's
Agro-Ecological Zones (AEZ) model for China(see: Fischer, G., 1998). The results are from
an intermediate step, in which the model produces potential crop yields based on agro-climatic
conditions. At this stage, the model does not take into account soil constraints and other
physical constraints for crop cultivation. In other words: these model results overestimate
the potential crop yields in China - however, not very much.
These yield estimates essentially indicate, how many tons of crops per hectare could be
produced in a particular 5 x 5 grid cell, given its agro-climatic conditions. To get this
estimate, the model algorithm compares about a dozen crop growth profiles against the
length of growing period in this cell (which is determined by various agro-climatic
parameters, such as the temperature profile). The model "accepts" the crop,
which produced the highest output under the given agro-climatic profile. For
details of the methodology, please check Fischer, G. (19..): ...
For instance, China has some 466 thousand square kilometers of land (some 5% of its land
area), in which the climate conditions would permit crop cultivation at the very high
level of 10 to 13 tons per hectare. Some 166 million Chinese live in these very
fertile areas - about 14% of the population. |
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Revision 2.0 (First revision published in 1999)
- Copyright © 2011 by Gerhard K. Heilig. All rights reserved. (First revision: Copyright © 1999 by IIASA.) |
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