热带地理Issue(2)：141-147,7.
元谋干热河谷强侵蚀区陷穴发育特征与演化过程
Development Characteristics and Evolution Process of the Sink Holes in Yuanmou Dry-Hot Valley
摘要
Abstract
Yuanmou dry-hot valley is located in Jinsha River Basin in the upper reaches of the Yangtze River. It is a typical subtropical climate area with special geographical position and geologic environment. The development of erosional landforms is one of the main reasons for water and soil loss in Yuanmou dry-hot valley. Sink hole is a type of erosional landforms. From 2009 to 2013, field survey was made on the morphological features of the sink holes, the topography and geomorphology of their surrounding areas, and the vegetation and soil around the sink holes. Also the soil of the areas was sampling and analyzed. The results show that the sink holes mainly develop in the strata of Yuanmou formation, where the soil is characterized by its easy disintegration and collapsibility. The sink holes are located at the bottom in the middle and upper reaches of gully and at the top of gully branches. The shape and scale of the sink holes in Yuanmou are generally small. In early stage they are approximately circular in shape, in middle and late stages they are elliptic, and in last stage they become gullies within gully, and even disappear. The sink holes are normally distributed individually, or like a string of beads, but rarely clump together. The evolution process of the sink hole can be divided into four stages, namely germination stage, young stage, mature stage and withered stage. There is close correlationship between the developing process of sink hole and the erosional landforms such as gully, earth bridge and washing hole, etc.关键词
干热河谷/陷穴/潜蚀地貌/冲沟/元谋Key words
dry-hot valley/sink hole/erosional landforms/gully/Yuanmou分类
天文与地球科学引用本文复制引用
舒成强,张斌,蒋良群,刘守江,罗明良..元谋干热河谷强侵蚀区陷穴发育特征与演化过程[J].热带地理,2014,(2):141-147,7.基金项目
四川省教育厅自然科学青年项目（12ZB150）；国家自然科学基金青年项目 （）
