The realizability for distribution range shifting of steppe in an Inner Mongolia by global warming

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  • Araki Masayuki
    Graduate school of life and environmental sciences, Tsukuba University
  • Cheng Yunxiang
    Graduate school of life and environmental sciences, Tsukuba University

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  • 地球温暖化による内蒙古草原の移動可能性
  • チキュウ オンダンカ ニ ヨル ウチモウコ ソウゲン ノ イドウ カノウセイ

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Abstract

P/PET_t ratios of many meteorological stations in the Inner Mongolia Autonomous Region were assessed with climatic normals for 1951 to 1980, 1961 to 1990 and 1971 to 2000. Distribution maps for each of the six grades of lands aridity in the three periods were drawn with these ratios. The advance of aridity in each steppe was determined by comparing the three maps. The temperature rise in the twenty years during the first to third period was about 0.8℃. This is nearly equal to the value assessed from the increase rate between 1971 and 1988 (0. 349℃/year) and very close to the value determined by Yatagai and Yasunari (1994). Simulated P/PET_t ratios of eleven stations selected for the third period were nearly equal to the actual values of the period. Here, the simulation was a recalculation of P/PET_t with the mean monthly temperature and adding 0. 698℃ to the original value of each month and each station. Therefore, the decrease of P/PET_t is caused by an increase of temperature. As a result, we concluded that the movement of distribution area of each steppe in the Inner Mongolian Autonomous Region is caused by the gradual increase of temperature with global warming.

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