Eco-Climate Characteristics of the Wetlands in Northeast China

Wetlands usually are distributed at the connection zone of terrestrial ecosystems and aquatic ecosystems,and formed by the interaction of them.It provides such ecological services as water storage,flood mitigation,water purification and stabilization of local climatic conditions,etc.Wetland is viewed as 'kidney of the Nature' due to its abundant resources and unique ecological structure and functions.Based on the Northeast climatic regionalization,the basic thought of physiognomy landscape is presented in this paper,and the main wetlands in Northeast China are classified into several types,such as wetlands in northern slopes of Great Xing'anling Mountains,wetlands in Sanjiang Plain,wetlands in Songnen Plain,wetlands in XiaoXing'anling Mountains and Changbai Mountains,wetlands in Kerqin, wetlands in middle and lower reaches of Liao river,wetlands in Liaodong gulf and wetlands in Hulunbeir.According to China wetlands database,there are 65 patches of wetlands which is more than 10km~2 in the Northeast.Based on the global climatic grid(0.50×0.50)database which was built by Leemans and Cramer(1990),in the seven patches of wetlands above,the climate data of 358 point grid in the Northeast from 1950 to 1989 are used to compute the Kira's Warmth Index(WI),Cold Index(CI) and Humidity index(HI).The WI of wetlands in the Northeast ranges from 20℃ per month to 103℃ per month and the CI is-205℃ per month to-80℃ per month.The HI is 4.5 mm/℃ per month-20mm/℃ per month.The index of the wetlands is lower than that at the same latitude because of the cold and humid effect of wetlands.Based on the analysis and modification of Holdridge life zone model,this paper makes an eco-climate research on the wetlands in the Northeast.According to the life zone index of the model,this paper gets the results: for the wetlands in northern slopes of Great Xing'anling Mountains,BT≤5.5℃、P≤450mm、PER≤1.0,it belongs to Cold temperate humid forests life zone;for wetlands in Sanjiang Plain,7℃BT≤8℃、500mmP≤550mm、1.0PER≤1.5,it belongs to Temperate semihumid forests/meadow prairie life zone;for wetlands in Songnen Plain,8℃BT≤9℃、400mmP≤550mm、1.5PER≤2.0,it belongs to Temperate semi-arid meadow prairie wetlands;for wetlands in XiaoXing'anling Mountains and Changbai Mountains,5.5℃BT≤7℃、500mmP≤650mm、PER≤1.0,it belongs to Temperate humid forests life zone;for wetlands in Kerqin and Hulunbeir,9℃BT≤9.8℃、400mmP≤500mm、1.5PER≤2.0,they belong to Temperate semi-arid prairie life zone;for wetlands in middle and lower reaches of Liao river,wetlands in Liaodong gulf,BT9.8℃、P650mm、1.0PER≤1.5,they belong to Warm temperate semi-humid meadow prairie life zone.