全球已知大型喀斯特天坑数量的2/3在中国，但有关我国天坑苔藓植物的研究薄弱。本项目以南方喀斯特天坑为研究对象, 探索典型天坑背景值下苔藓区系特征及其分布规律特征, 内容含(1)天坑苔藓分类研究;(2)天坑苔藓区系研究; (3)天坑内苔藓与周边苔藓区系关系研究；(4)地貌(如天坑直径、深度、坡度和面积等)对苔藓的影响;(5)环境因子(光、湿度、温度、pH值、植被和基质等)对天坑内苔藓的影响; (6)天坑苔藓分布规律初探。. 我国南方山区（黔、渝、桂）是全球喀斯特天坑最发育、最集中和最典型的区域，具有实现本项目的优越自然条件。本项目对深入研究我国南方喀斯特苔藓植物区系特征具有重要理论意义，可为国家环保、地质和旅游部门提供基础性的科学数据和资料。

Karst Tiankengs are special landforms with unique bryophyte flora. There are about 2/3 number of typical Karst Tiankengs reported from southern China. The aims of this project are to study on floristic characteristics of bryophytes and their distribution rule from Karst Tiankeng in Southern China.The Main contents of this research include:.1) Taxonomic research on bryophytes in Karst Tiankengs;.2) Floristic characteristics of bryophytes in Karst Tiankengs;.3)Relationship between the flora of bryophytes inside Karst Tiankeng and around it..4)Effects of karst geomorphological features on bryophytes ;.5)Effects of environmental factors on bryophyte in Karst Tiankengs;.6)Distribution characteristcs of bryophyte in Karst Tiankengs..This research is very significant for us to study on the formation and evolution of bryophytes in Karst Tiankengs. It is also helpful for us to understand flora,biodiversity characteristics and conservation of bryophytes in the karst area of southern China. After finishing this project, we shall supply basic scientific data and information for related tourism industry, environmental protection and department of geology.