广西石漠化的成因分析和发展趋势预测

广西的石漠化主要是由自然因素(主要为岩性、坡度、植被及降雨量)和人为因素,以及这两种因素迭加作用而引起的.利用数字图像处理技术,我们预测出广西潜在石漠化面积(即坡度大于25度的未出露碳酸盐岩区)最大的是河池市,第二是百色市和崇左市.河池市、百色市和崇左市分别还有25.84%、36.26%和37.41%坡度大于25度的未出露碳酸盐岩区仍在进行容易发生石漠化土地利用方式(灌溉水田和旱地).这些地区必须严格实行生态保护,采取防止水土流失措施,有条件的应逐步退耕还林还草还竹,阻止石漠化发生.

The Origination Analysis and Progress of the Rocky Desert of Land in Guangxi

The rocky desert of land in Guangxi mainly results from the natural factors(such as the lithology,slope,vegetation and rainfall etc.),human activities or the complex effect of the both factors above.The GIS and RS were used to work out the latent acreages of the rocky desert of land in Guangxi,which are the areas of the unexposed carbonatite with the slope more than 25 degrees.The largest area is located in Hechi city,the second in Baise and Congzuo city.In Hechi,Baise and Congzuo cities,the land of the latent rocky desert is still cultured in a mode of the land easily being eroded,the percentage of the acreages is seperately 25.84%,36.26% and 37.41%.To block the rocky desert appearing,the rigorous steps to protect the local ecology are required,particularly to keep the land from being eroded in these areas.In some areas under the appropriate conditions,the land of the latent rocky desert should be returned to cultivation of trees,grasses and bamboos.