滇东南丘北区峰丛—洼地地貌形态特征分析

云贵高原东南部丘北区为峰丛—洼地岩溶组合地貌。利用统计分析方法考察了该区48个岩溶洼地及峰体的形态参数特征；利用分形理论方法计算了不同高程的等高线和地表水系的分维数。结果表明:（1）洼地的平均边数为5.6，平均周长3.4km，平均面积0.8km2；（2）洼地的加深和扩大近于同步，原始地面对后期溶蚀面的发育起控制作用；（3）峰丛—洼地的形态分形特征对岩溶演化具有很好的响应关系，可溶岩区等高线分维数平均为1.30，非可溶岩区为1.16，地表水文网分维数为1.07，反映岩溶区地形变化复杂，地下水文网较发育，岩溶发育程度较高；（4）研究区岩溶发育仍处于幼年至壮年期，将继续缓慢发育。 

Analysis on morphologic features of the peak-cluster depression in Qiubei, Southeast Yunnan

Qiubei peak-cluster depression in southeast Yungui Plateau, about 40km2 in area , is chosen as the sample region for karst landform fractal geometry analysis. Statistical method is used to analyze the characteristic parameters of 48 karst depressions and peaks; fractal theory is chosen to calculate fractal dimensions at different elevation contours and surface water network. The results indicate that: (1) the average area of the depressions is 0.8 km2, the mean boundary-namber is 5.6 and the average perimeter is 3.4km; (2) depressions grow in breadth and in depth near-synchronously, and the development of corrosion surface is restricted by the elevation of initial surface; (3) fractal characteristics of peak-cluster depression are well response to the karst evolution, and the average fractal dimension of contour in limestone region and non- limestone region is 1.30 and 1.16 respectively, and the dimension of surface water network is 1.07, which reflect topographic change are complicate, underground hydrographic net are quite developed and the relative degree of karst development is high in this karst region; (4) the karst in Qiubei is in the young or mature stage, and will continue to develop slowly.