广西区域热带岩溶地貌不同类型的演化浅议

DISCUSSION ON THE EVOLUTION OF DIFFERENT TYPES OF REGIONAL TROPICAL KARST LANDFORM IN GUANGXI

文中论述了广西区域热带岩溶地貌三大类型 ,即 :(1)以玉林、贵港市为代表的桂东南岩溶平原 (残山平原 )类型 ;(2 )以桂林、柳州为代表的桂东北 -桂中 -桂西南峰林平原类型 ;(3)以都安、乐业为代表的桂西 -桂西北峰丛洼地类型。进而阐述了三大岩溶地貌类型的特点与演化 ,认为它们存在着发育时间上的长短不同 ,营力上的差异 ,也就出现岩溶地貌类型上的各异。岩溶地貌类型中老、中、青的概念仍有意义。岩溶形成的“同时态论”在小区域内岩溶地貌的一定发育阶段可能存在 ,但在大区域或长时间尺度内就不一定适用。

In this paper three main types of regional tropical karst landform in Guangxi are discussed, namely, karst plain(residual mountain plain) which typically develops around Yulin and Guigang cities in southeast Guangxi; Fenglin(peak forest) plain well developed in northeast-central-southwest Guangxi and typically located in Guilin and Liuzhou cities; Fengcong(peak cluster) depression well developed in Du'an and Leye counties of northwest Guangxi. Moreover, their features and evolution are explained. It is considered that the developing time scale and driving force, which result in karst landform differences, are quite different between three main types of karst landform. The concepts of topographic old age, maturity, and infancy are still meaningful. In a small spatial scale, 'Simultaneously systematical evolutionism' might be used for a certain developing stage of karst landform history, but questionable in a large spatial or long-term scale.