中文摘要：

为对崩岗的其敏感性进行有效评价,在对影响崩岗发生的空间因素进行识别的基础上,应用生态位适宜度模型构建崩岗发生敏感性的评价方法,并对福建省安溪县的小流域进行实证研究。结果表明：各敏感性等级中现有崩岗的发生频率和分布比率分别为0.31%、1%、1.94%和3.67%与4.55%、14.39%、28.03%和53.03%,可以看出这2个值均随崩岗发生敏感性等级的提升呈阶梯性增加,说明该评价方法科学合理;对崩岗发生敏感性贡献较大的空间因子为相对高差、粘粒含量和NDVI。由此提出防范崩岗发生的相关建议：对于敏感性较高的区域需要增加植被、缩小地形落差,对于敏感性较低的区域要严禁不合理的开山以及破坏植被的行为。

英文摘要：

The collapsed gully is a threat to agricultural production and agricultural ecological environment with occurrence uncertainty,which means the sensitivity of collapsed gully occurrence plays a crucial role to this subject. A framework is proposed to evaluate the sensitivity of collapsed gully occurrence in granite region of South China based on niche-fitness model. To test this approach,one small watershed in Anxi County Fujian Province is chosen as the case study area. And the results show that the frequency and distribution ratio of collapsed gully in each sensitivity rank are 0.31%,1%,1.94%,3.67% and 4. 55%, 14. 39%,28.03%,53.03% respectively. It means these two values increase stepwise following the rise of sensitivity rank, which proved this assessment method is scientific and reasonable. The results of correlation analysis between the sensitivity of collapsed gully occurrence and the niche-fitness of various factor show that altitude difference and clay content make more contribution to the sensitivity assessment, next for NDVl and flow accumulation, last for altitude and upper slope,which is concerned with the dispersion of each factor distribution and the correlation between factors. The proposals for the prevention work of coltapsed gutly were put forward according to the above results： the behavior of increasing vegetation cover and reducing altitude difference should be taken in the area of stronger sensitivity, and the behavior which could change natural terrain and destroy vegetation cover should be forbidden in the area of weaker sensitivity.