32
rainfall erosivity in Central Asia. To analyze the influence of the geographic location,
a linear relationship was established between the mean annual precipitation erosion
and longitude and latitude. As can be seen from Fig. 4.3c, the correlation coefficient
between rainfall erosivity and longitude is r = 0.237 (r
2
= 0.056, P < 0.001), which
confirms a significant relationship. From Fig. 4.3d, it can be shown that the coefficient between the rainfall erosivity value and latitude is r
2
= 0.0106 (P = 0.092),
Fig. 4.3 The relationship between rainfall erosivity and annual rainfall (a), altitude (b), longitude
(c), and latitude (d) in Central Asia
Table 4.3 Estimates of the current annual potential soil loss in Central Asia by countries
Countries
Mean erosion
(t
−1 ha
−1 year
−1 )
Soil loss
(×10
6 t year
–1 )
Proportion of soil loss
of each region (%)
Area (km
2
)
% of
area
Kazakhstan
0.55
147.47
14.56
2669209.90 69.16
Kyrgyzstan
16.55
292.06
28.83
176512.94 4.57
Tajikistan
39.45
459.38
45.34
116448.06 3.02
Turkmenistan 0.24
11.29
1.11
469008.06 12.15
Uzbekistan
2.40
102.96
10.16
428141.06 11.09
Central Asia 2.62
1013.16
100.00
3859320.10 100.00
4 Projected Rainfall Erosivity and Soil Erosion in Central Asia
rainfall erosivity in Central Asia. To analyze the influence of the geographic location,
a linear relationship was established between the mean annual precipitation erosion
and longitude and latitude. As can be seen from Fig. 4.3c, the correlation coefficient
between rainfall erosivity and longitude is r = 0.237 (r
2
= 0.056, P < 0.001), which
confirms a significant relationship. From Fig. 4.3d, it can be shown that the coefficient between the rainfall erosivity value and latitude is r
2
= 0.0106 (P = 0.092),
Fig. 4.3 The relationship between rainfall erosivity and annual rainfall (a), altitude (b), longitude
(c), and latitude (d) in Central Asia
Table 4.3 Estimates of the current annual potential soil loss in Central Asia by countries
Countries
Mean erosion
(t
−1 ha
−1 year
−1 )
Soil loss
(×10
6 t year
–1 )
Proportion of soil loss
of each region (%)
Area (km
2
)
% of
area
Kazakhstan
0.55
147.47
14.56
2669209.90 69.16
Kyrgyzstan
16.55
292.06
28.83
176512.94 4.57
Tajikistan
39.45
459.38
45.34
116448.06 3.02
Turkmenistan 0.24
11.29
1.11
469008.06 12.15
Uzbekistan
2.40
102.96
10.16
428141.06 11.09
Central Asia 2.62
1013.16
100.00
3859320.10 100.00
4 Projected Rainfall Erosivity and Soil Erosion in Central Asia