Research on control way for cultivated land in karst rocky desertification basin—A case in Shiqiao Basin, Bijie City and Mugong Basin, Guanling City in Guizhou Province

Shiqiao Basin in Bijie City and Mugong Basin in Guanling City in Guizhou Province are karst rocky mountain areas with strong rocky desertification, high density of population, and low and instable grain yield as well as low agricultural economic level. Through forecasting the increase trend of the population and using the human-land balance model, the necessary farmlands for these two basins have been counted as 281.91 hm2 and 228.68 hm2, However, the area of necessary farmland is larger than non-desertification farm-land, which leads to rocky desertification still appear in the farmland. If the grain for green project has been carried out in this place, it will not meet the need for food. Therefore, the measures as intercropping of trees and crops, crop-grass intercropping, reforming sloping fields to terraced fields have been carried out. As a result, rocky desertification has been controlled and soil erosion modulus of the two basins has decreased from 721.63t/(km2?a) and 42.42t/(km2?a) in 2007 to 472.78t/(km2?a) and 35.59t/(km2?a) in 2009, vegetation covered lands have increased by 11.3% and 6.4%, per capital income has increased by 300 Yuan and 231 Yuan. Rocky desertification has been controlled as well as peasants have got much more livelihood safety.