中文摘要：

石漠化严重威胁着喀斯特地区经济社会发展和生态安全,已经成为国家、政府和当地民众的重大关切。本文基于全国石漠化监测评价体系,并对相关指标进行调整,如用（NDRI）改进基岩裸露度指数、用土壤侵蚀模数代替土壤厚度,提取出研究区的石漠化分布区域。并结合土壤、地貌、海拔、坡度和河网密度等自然地理因子及人口密度、GDP、居民点分布等人类干扰因子进行综合分析,探究了影响石漠化的主要因子和作用原理,并对石漠化的空间分布特征进行分析。结果表明：石漠化主要分布在黄壤、石灰土和水稻土等土壤类型区,但易发程度大小则为石灰土〉紫色土〉水稻土;斜坡和陡坡发生中度以上石漠化的比例达40%,且以坡耕地区更多;石漠化区域降水量多在1000–1200 mm,是造成石灰土基底和坡耕地水土流失的主要原因;此外,石漠化与居民点分布、人口密度、坡耕地和人口贫困关系密切。

英文摘要：

Rocky desertification is a serious threat to socioeconomic development and the ecological security of karst areas. The control of rocky desertification has therefore become a major concern of both the Chinese government and local populations living in karst areas. In this paper, we used the national evaluation system for monitoring rocky desertification, and adjusted relevant indices. For example, we improved the system＇s base rock exposure index with Normalized Difference Rock index（NDRI）, substituted a soil erosion index for soil depth, and from these obtained the categories and spatial distribution of rocky desertification. We also studied the main factors and functional mechanisms of rocky desertification with consideration given to natural geographic conditions such as soil, physiognomy, elevation, slope and river network density, and, also human interference factors such as population density, GDP, population distribution, and from these got spatial distribution characteristics and influencing factors of rocky desertification in Qiandongnan prefecture. Results indicate that the primary soil types of rocky desertification in the research areas include yellow, limestone and paddy soils. These rocky desertification areas are more likely to contain limestone soil than purple soil, and least likely to contain paddy soil. The distribution of moderate or severe rocky desertification in areas with moderate to steep slope is 40%, where sloping agricultural land comprises a large proportion of the total. Rocky desertification is widely distributed in regions with precipitation between 1000–1200 mm, and this precipitation is the main factor causing greater soil erosion in limestone soil base and sloping agricultural areas. Moreover, desertification is closely related to the distribution of residential areas, population density, poverty and sloping agricultural land