Abstract: By using wavelet transform and remote sensing techniques, the influence of clima te change on the unique mosaic landscape of sand land-wetland in middle-east I nner Mongolia in 1961-2005 was studied. The results showed tha t in 1961-2005, the annual air temperature in study area had a n increment of 032 ℃·(10 a)-1, the annual precipitation fluctuated with a cycle of 30 years and of 15 years, and the annual average wind speed decreased by 026 m·s-1·（10 a）-1. In the southeast part of study area, which located in the places between Hunshandake sand land and Keerqin Deserts, there w as a district, in which, the climatic characteristics did not change evidently. Until 2010, the study area would still have an increasing air temperature, lesse r precipitation, and decreasing wind speed. Under the influence of warming and drying, the total area of Hunshandake sand land and the wetland a round reduced year after year, and, with the vegetation degradation on sand land , wetland shrunk and lake dried up, moving sand land enlarged ceaselessly, whil e immovable and semi-moving sand lands reduced obviously.

Key words: stable isotope, forest, partitioning., respiration