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In addition to climate change, anthropogenic interferences may play an important role in leading to the change point. Soil loss is greatly severe in the WRB. Hence, the soil conservation practices including grass-planting, afforestation, building check dams, and creation of level terraces have been performed since 1960. The detailed areas of soil conservation practices are shown in Table 2.

Table 2

The areas of soil conservation practices in the YRB

 Area of soil conservation practices (km2)
TimeLevel terranceAfforestationGrass-plantingCheck damTotal
1960 172 327 47 552 
1970 974 1,309 193 24 2,500 
1980 2,918 3,886 446 64 7,314 
1990 4,758 8,468 2,320 78 15,624 
2000 9,088 14,924 3,648 134 27,794 
2006 11,779 17,157 4,265 143 33,344 
 Area of soil conservation practices (km2)
TimeLevel terranceAfforestationGrass-plantingCheck damTotal
1960 172 327 47 552 
1970 974 1,309 193 24 2,500 
1980 2,918 3,886 446 64 7,314 
1990 4,758 8,468 2,320 78 15,624 
2000 9,088 14,924 3,648 134 27,794 
2006 11,779 17,157 4,265 143 33,344 

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