Abstract:

The variations of temperatures at the surface and plow layer during 1952-2010 in the west region of Liaoning province were studied by methods of a climate tendency rate, a standard deviation and a baseline year. The results show that the annual mean surface temperature, and the mean temperature of the surface and plow layer in the growing season are in increasing trends, and the climate tendency rates are 0.395 ℃per decade, 0.304 ℃per decade and0.206 ℃per decade respectively. The higher increasing rates occur in winter with 0.535 ℃ per decade and spring with 0.521℃ per decade, and the lower increasing rates are in summer with 0.223 ℃ per decade and autumn with 0.291℃per decade respectively. Warming in the third baseline year is most significant. This study could provide the references for the structural readjustment of agricultural production and the ecological environment improvement, etc. in this region.

Key words:  Surface temperature, Plow layer temperature, Tendency rate