31
h
−1
year
−1
. Conversely, the baseline data show the range of rainfall erosivity to be
95–1838.9 MJ mm ha
−1
h
−1
year
−1
with a mean and standard deviation of 476.8 and
267.1 MJ mm ha
−1
h
−1
year
−1
, respectively. In comparison, the baseline and observed
rainfall erosivity produced r, RМSЕ, and NSЕ values of 0.90, 156.7 MJ mm ha
−1
h
−1
year
−1
, and 0.60, respectively. This represents a good model performance.
Figure 4.3a presents the relationship between rainfall erosivity with precipitation
Moreover, rainfall erosivity has the best correlation with altitude (r = 0.413, r
2
=
0.171, P < 0.0001), indicating a significant relationship with the spatial variation of
Fig. 4.2 Map of soil erosion grade in Central Asia
Table 4.2 Conversion from erosion rate to erosion grade, with corresponding areas of each
erosion grade and its proportion in Central Asia
Soil erosion rate
Area km
2
% share
Mean soil loss (t
−1 ha
−1 year
−1 )
Very slight
2494420.75
64.63
0.0002
Slight
550033.88
14.25
0.0440
Light
496120.50
12.86
0.3275
Moderate
132408.75
3.43
2.3180
Intense
43963.06
1.14
7.1744
Very intense
40344.88
1.05
14.3648
Severe
102042.94
2.64
85.6756
The data source for this classification is provided by Teng et al. (2019)
4.3 Rainfall Erosivity Analysis Under Baseline and Projected Climate
h
−1
year
−1
. Conversely, the baseline data show the range of rainfall erosivity to be
95–1838.9 MJ mm ha
−1
h
−1
year
−1
with a mean and standard deviation of 476.8 and
267.1 MJ mm ha
−1
h
−1
year
−1
, respectively. In comparison, the baseline and observed
rainfall erosivity produced r, RМSЕ, and NSЕ values of 0.90, 156.7 MJ mm ha
−1
h
−1
year
−1
, and 0.60, respectively. This represents a good model performance.
Figure 4.3a presents the relationship between rainfall erosivity with precipitation
Moreover, rainfall erosivity has the best correlation with altitude (r = 0.413, r
2
=
0.171, P < 0.0001), indicating a significant relationship with the spatial variation of
Fig. 4.2 Map of soil erosion grade in Central Asia
Table 4.2 Conversion from erosion rate to erosion grade, with corresponding areas of each
erosion grade and its proportion in Central Asia
Soil erosion rate
Area km
2
% share
Mean soil loss (t
−1 ha
−1 year
−1 )
Very slight
2494420.75
64.63
0.0002
Slight
550033.88
14.25
0.0440
Light
496120.50
12.86
0.3275
Moderate
132408.75
3.43
2.3180
Intense
43963.06
1.14
7.1744
Very intense
40344.88
1.05
14.3648
Severe
102042.94
2.64
85.6756
The data source for this classification is provided by Teng et al. (2019)
4.3 Rainfall Erosivity Analysis Under Baseline and Projected Climate