Agriculture Reference
In-Depth Information
4.0
3.5
3.0
2.5
y
= 0.03
x
+ 0.57
R
2
= 0.69
2.0
50
60
70
80
90
100
SOM score
FIGURE 18.2
Gross agricultural production (1982) as a function of SOM ranking values of
11 municipalities of Jiangsu as per the second soil survey conducted between 1979 and 1982.
This relationship may be explained by the impact of SOM on crop yield and sta-
bility that helped in ensuring food supply and income from agriculture for the local
people before industrialization. Such an impact is also indicated by a correlation of
mean GDP with the SOM scores of their croplands (Figure 18.3). Nevertheless, such
a role is becoming less important because the local economy is progressively less
dependent on crop production (Figure 18.3a and b).
Therefore, SOM plays an important role in China's crop production and, con-
sequently, in the sustainable food supply of China. This role may lead further to a
strong impact on the local economy and, in turn, the livelihood of the local people.
For a region with agriculture as the predominant economic sector, the role of SOM
is critical and must not be underestimated.
(a)
(b)
3.0
2.5
2.0
1.5
2.0
0.5
0.0
50
60
50
40
30
20
10
0
50
y
= 0.07 e
0.04
x
R
2
= 0.73
y
= 0.07
x
4.23
R
2
= 0.72
60
70 80
SOM score
60
70 80
SOM score
90
100
90
100
FIGURE 18.3
Gross domestic product (GDP) as a function of cropland SOM ranking val-
ues for the municipalities of Jiangsu Province. (a) GDP data for the year of 1982 and SOM
data from the second soil survey finalized in 1982. (b) GDP data for the year 2004 and SOM
data from the geological survey of the province completed in 2004.
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