贵州喀斯特石漠化分布的空间差异与防治区划探讨

在广泛调研基础上,根据区域分异原理,对贵州石漠化空间分布与差异进行了分析总结.研究表明,贵州喀斯特石漠化分布存在明显区域差异.在水平分异上,从西向东存在"轻~重~轻~重~轻"的基本规律;在南北方向上,存在"重~轻~重"的规律;在垂直方向上,存在从河谷至分水岭的分异:分水岭地区石漠化程度不高,河谷斜坡地带石漠化较强,河谷底部又较轻的变化规律.据此,根据自然区划理论与方法,提出喀斯特石漠化分区防治的基本思想,将贵州喀斯特石漠化防治初步划分为7个防治区、20个防治亚区,并选取典型区域进行三级区划分.

DISCUSSION ON THE SPATIAL DIVERSITY AND PREVENTIVE REGION DIVISION OF KARST ROCKY DESERTIFICATION AREA IN GUIZHOU

On the basis of widespread survey,the article analyzed and summarized the distribution of karst rocky desertification in Guizhou according to principles of regional differentiation.It showed that there is remarkable regional difference in distribution of karst rocky desertification in Guizhou.Horizontally,there is a general changing rule of slight-severe-slight-severe-slight from the west to the east,and a rule of severe-slight-severe from north to south.Vertically,differentiation rule from the valley to the watershed also exists.It is slight on watershed,stronger along the slope,and slight on the river valley.Correspondingly,according to the theory and approaches of natural division,basic idea for the prevention of karst rocky desertification is proposed,7 patches of preventing areas and 20 sub-areas are divided preliminarily,and at the same time tyical areas are picked out to be divided on the 3rd grade of division.