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Response of grass growing season to meteorological change in eastern Inner Mongolia grassland.

LI Xia-zi1,2, HAN Guo-dong1**   

  1. (1College of Ecology and Environmental Science, Inner Mongolia Agricultural University, Hohhot 010018, China; 2Meteorological Science Institute of Inner Mongolia, Hohhot 010051, China)
  • Online:2013-04-10 Published:2013-04-10

Abstract: Studying the effects of regional climate change on the grassland grasses growth is of significance for guiding local farming and animal husbandry production. Based on the 50 years observation data from 34 meteorological stations and the 27 years grass phenological data from three animal husbandry meteorological experimental stations in eastern Inner Mongolia grasslands, this paper studied the effects of climate change on the growth season of dominant grasses in the grasslands. In eastern Inner Mongolia, the mean air temperature in spring, summer, and autumn had a significant rising trend. The precipitation in spring had a slight increasing trend, but that in other seasons presented a decreasing trend. Climatic warming and drying trend was obvious. The rising of the air temperature in spring promoted the advance of the date of turning green. With an increase of 1 ℃, the turning green date of Leymus chinensis and Stipa baicalensis in Evenk and Ergun advanced 1.7-1.9 days. The rising of the air temperature both in summer and in autumn delayed the date of yellowing and withering. With an increase of 1 ℃, the yellowing and withering date of L. chinensis and S. baicalensis in Ergun postponed 2.0-2.3 days. With an increase of 1 ℃ in summer and autumn, the growth season of S. baicalensis in Ergun prolonged 3.3-3.7 days. With an increase of 1 ℃ in autumn, the growth season of Agropyron cristatum in Bayaertuhushuo shortened 2.8 days.

Key words: material flow analysis, economic-environment system, Johansen cointegration test, impulse response function, variance decomposition analysis.