Impact of Climate Change on Spring Wheat Growth in SemiArid Rain Feed Region
Received date: 2007-01-01
Revised date: 2007-01-01
Online published: 2007-03-10
Using surface observation data of Dingxi agricultural meteorological station from 1986 to 2004, the impact of climate change on spring wheat growth in semi-arid rain feed region was investigated. The results showed that in the last 19 years temperature had increased, but precipitation had decreased in this region, the response of spring wheat growth to climate change took the form that the growing season had come in advance, growth period had shortened and yield had fallen off. The correlativity analysis also revealed that the impact of precipitation on spring wheat was more noticeable than that of temperature. In the whole growth period of spring wheat, the response was different in yield and phase growing on climate change, such as the appearing time of sprouting, jointing, tasselling and maturity being ahead but milking being postponed. That is to say, it shortened the spring wheat's nutrition growth stage of seeding-sprouting, elongated the sprouting-jointing stage, cut down the generative growth in the jointing-tasselling phase, prolonged the tasselling-milking stage, and shortened the milking~maturity stage. These finally resulted in the shortening of whole growth period. It had significantly positive effect on yield due to precipitation decreasing in spring wheat's sprouting-jointing and tasselling-milking stage(P<0.05), also it had highly significant negative effect on yield due to temperature increasing in jointing-tasselling phase(P<0.01). So we expect that with the climate further warming and the precipitation reducing, it will much more seriously influence the growth of spring wheat.
Key words： Semi-arid region; Spring wheat; Climate change; Growth; Impact.
ZHAO Hong, XIAO Guo-ju, WANG Run-yuan, DENG Zhen-yong,WANG He-ling, YANG Qi-guo . Impact of Climate Change on Spring Wheat Growth in SemiArid Rain Feed Region[J]. Advances in Earth Science, 2007 , 22(3) : 322 -327 . DOI: 10.11867/j.issn.1001-8166.2007.03.0322
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