| Stone forest, which is a kind of rare karst geomorphology and called as pinnacle karst in other countries, refers to the forest-like landform composed of the stone pillars more than 5 meters high and resulted from longtime dissolution of limestone along joints. The origin and development of stone forest has attracted many karst researchers home and abroad, and they have done some macroscopical and microscopical studies on stone forest in terms of such conditions for its development as geology, climate, hydrological process, sub-soil corrosion, geomorphological types, history of development, paleo-geographical enviroment and biological effects etc, and put forward some development models, however, most of the studies just pay their attention to some single aspects of the problem.As a kind of karst geomorphology, stone forest is always distributed in a kast drainage basin , its development is inevitably related to evolution of the whole catchment. Therefor, in the light of theory and methods of karst hydrogeomorphology and the knowledge of transformation, balance and variation of matter and energy in karst drainage basin , we can examine stone forest within a specific scope of time and space, and reveal the mechanism and the development model of stone forest with the help of the principle of the mutual response processes among base-level, water flow and forms.Just based on the understanding above, the paper, with a special reference to the Lunan stone forest which is the best developed one in China, discusses the hydro-geomorphlogical structure of the Bajiang river, geomorphological types and spacial distribution feature of the stone forest, and studies the erosion rate on the top of stone forest, soil erosion rate, sub-soil dissolution rate and their combined influences on the evolution of stone forest, furtherly brings forward and demostrates the "tri-level erosion" mechanism for the development of stone forest. Then , by the comprehensive analysis of essential conditions for stone forest development, and the quantitative study on the evolution phases of Bajiang karst catchment and the spacial coupling analysis of its hydro-geomorphological system, the paper studies the relationship between the evolution of Bajiang karst drainage area and the development of stone forest, and, combined with the evolution history of the catchment, puts forward a model concerning the relationship between the evolution of Bajiang karst catchment and stone forest development,In the mechanism of "tri-level erosion", if A< S |
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