historical land desertification 历史时期土地沙漠化
There is an obvious developing tendency of sandy desertification in the blowing sand region of middle Ningxia in historical time, especially since 1950's.
宁夏中部风沙区的沙质荒漠化在历史时期，尤其是本世纪50年代以来，具有明显扩展的趋势。
The formation of karst rocky desertification (KRD) is quite complex, but little related research for formation of KRD in Guizhou Province in historical period has been done in academic circles.
石漠化的形成是一个较为复杂的过程，但学术界对其历史时期的形成过程探讨较少。
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