Short-term effects of fire disturbance on greanhouse gases emission from hassock and shrubs forested wetland in Lesser Xing‘an Mountains, Northeast China Dynamics of greenhouse gases emission and its impact factors by fire disturbance from Alnus sibirica forested wetland in Xiaoxing‘an Mountains, Northeast China Short-term effects of fire disturbance on greanhouse gases emission from Betula platyphylla- forested wetland in Xiaoxing’an Mountains, Northeast China.