tailieunhanh - Báo cáo " The Vietnamese Wetlands Classification System "

The Vietnamese Wetlands Classification System is an important basis for governmental agencies, non‐governmental organizations, and scientists to identify wetlands that are under‐ represented in the List of Wetlands of International and National Importance in order to encourage their designation and appropriate long term management. The classification also serves as a broad | VNU Journal of Science Earth Sciences 24 2008 96-103 The Vietnamese Wetlands Classification System Mai Trong Nhuan1 Nguyen Thi Thu I la2 Tran Dang Quy2 Nguyen Thi Ngoc2 Do Thi Thuy Linh2 Nguyen Thi Minh Ngoc2 Nguyen Thi Hong Hue2 Pham Bao Ngoc2 1 Vietnam National University Hanoi 2 College of Science VNU Received 1 May 2008 received in revised form 3 July 2008 Abstract. The Vietnamese Wetlands Classification System is an important basis for governmental agencies non-governmental organizations and scientists to identify wetlands that are underrepresented in the List of Wetlands of International and National Importance in order to encourage their designation and appropriate long term management. The classification also serves as a broad framework to aid the rapid identification of the main wetland habitats represented at each site to provide units for mapping and to encourage uniformity of concepts and terms in national wetland inventory. The Vietnamese Wetlands Classification System is a hierarchy of systems subsystems classes and types or sub-types of wetlands. The systems are defined based on salinity of water or distance of wetland from the sea - marine coastal wetland salty brackish wetlands and inland wetland freshwater wetlands . The subsystems are based on the main origin of wetlands - natural or artificial wetlands. The classes are defined based on the hydrological regime they would be permanent or non-permanent covered by water wetlands. The most important level in the classification system is the types. The types are defined based not only on geomorphologic geologic features and origin of wetlands but also the dominant life form of vegetation or physiography and composition of substrate features. Further the modifiers of the classification systems sub-types can be added based on relevant criteria and using objectives they must be developed by the users. There are 38 wetland types defined in the classification system purpose to ensure uniformity throughout