Abstract: With GIS and RS techniques,this paper analyzed the dynamic changes of mire landscape in Northeast China during 1986～2000.Northeast China is rich in mire,and the average mire ratio (the ratio of mire area to the total statistical area) is 3.66%.But,the distribution of the mire is not symmetrical,e.g.,Wusuli region has the largest mire ratio,while Suifenhe region has the least one.The mire in Northeast China has a shrinking trend,and its distribution center is to the northeast of the geometrical center,with the distance of 150.62 km,which reflects that the holistic state of the mire distribution is richer in northern part and less in southern part.The yearly change of the distribution center showed that the disturbance intensity was lighter in 1986-1996 than in 1996-2000,and the transfer of distribution center was differed with each sub-region in Northeast China.As for the transformation of the landscapes,the dynamic change of the mire is strongly affected by the agricultural activities including pasturing.The multi-year average patch area is 1.99 km²,and has an increasing trend.The fractal index of mire landscape showed an increasing trend,and the patch shape of the mire became more and more complicated.

Key words: Organic ground surface mulch, Urban forestry, Application value