Discussion on karst rocky desert evolution trend based on ecologically comprehensive

The status quo and variation of karst rocky desertification in south China is analyzed. Taking Guizhou, the most serious karst rocky desertification in south China, as a case, this paper discuss the evolution trend and changing features of karst rocky desert under ecological comprehensive treatment.Data show that the area of karst desert has risen to 37 597km2 (accounting for 21.34% of the total area of Guizhou) in 2005 from 35 920km2(accounting for 20.39% of the total area of Guizhou) in 2000, increasing 334.7km2 annually in average within the 5 years. But comparing with that from 1975 to 1999, the average increasing speed of karst rocky desertification obviously slowed down, which proves that the ecologically comprehensive treatment restrained the desertification tendency to some extend. Monitor data in the Huanjiang and the Qingzhen as well the Bijie demonstration plots show that the area of karst rock desert decreases under ecologically comprehensive treatment, which proves desertification is not the so call environmental cancer but able to be controlled or cured. However, the monitor data also indicates that the area of karst desert will be still account for about 14.9％ of the total area in Guizhou by the year 2030 even if the desert treatment brought into operation perfectly according with “the Integrated Rehabilitation Planning of Karst Rocky Desertification in Guizhou Province ”. Therefore, the desertification will last long and desert treatment will be a long term hard work that can not be completed within one or two Five-Year Plan. To keep down the tendency of desertification and environmental worsening radically, it is still necessary for the state and the government to increase large amount financial input for karst rocky desert improvement in the Twelfth Five Year Plan and the future.