Abstract: Global warming is a major environmental problem in recent social development of human being. And to best understanding variant aspect of the temperature risen in different ecosystems is also a foundation for serving the local ecology and environmental assessment and economic planning in regional scale. Then, this paper employed Rank Correlation Methods (Mann-Kendall test) to analyze temperature change trends comparatively among different ecosystems (Agricultural ecosystem/Forest ecosystem/Dry grassland ecosystem/Meadow steppe ecosystem) based on annual mean temperature data from 1961 to 2012 in the Northeast of China. Among them, the forest ecosystem reflects the features of mountain area; Dry grassland ecosystem reflects characteristics of the plateau in the Eurasian steppe eastern; Meadow steppe ecosystem reflects transition zone characteristics between the forest and steppe; Agricultural ecosystem reflects the characteristics of the northern of the Northeast plain. Effect of zonal latitude basic excluded, the temperature change is one of the important indexes of main ecosystem environment change in Northeast china in recent decades. Results showed that the change of annual highest temperature was the most significant; the second was annual mean temperature; the last was annual minimum temperature. It had a very good consistency in the temperature change trend among different ecosystems, while change trend of the 3 index was different in the same one. Annual mean temperature of meadow steppe ecosystem was the most significant; Rate of rise was the largest (0.44/10a) and abrupt point was the earliest. Annual highest temperature of agricultural ecosystem has been on the rise, especially the tendency was more significant in the 1990s, and abrupt point was the earliest.

Key words: air temperature change trends, Mann-Kendall test, ecosystems