| Influence of mean frozen soil depth in winter on spring wheat growth period in Hexi area of Gansu |
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| DOI：10.7606/j.issn.1000-7601.2009.01.48 |
| Key Words: Hexi area of Gansu frozen soil depth growth period spring wheat |
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| Abstract: |
| Using data of average frozen soil depth of winter from 11 stations with uniform distribution in Hexi area of Gansu,analysis is made of the inter annual variability characteristics of frozen soil depth and the effect of the frozen soil depth on the growth period of spring wheat.The results show that: the frozen soil depth of Hexi area of Gansu in winter shows a change fluctuation in the trend of decreasing year by year,and the rate of decrease is 5.5 cm/10a in nearly 45 years.Spring wheat growth periods are all ahead of trends in western,central and eastern part of Hexi area,and the most obvious trend of advance is in the central part.Frozen soil depth of winter is significantly associated with the growth period of spring wheat in the east and west,but not so obvious with that of the central station of Jiuquan,where it is only correlated with the emergence and three leaves stages.Spring wheat growth period postpones with the frozen soil depth increase,and the postponing rate is 1.8 to 2.4 d/10cm in Dunhuang,1.9～2.1 d/10cm in Jiuquan,and 1.3～3.0 d/10cm in Wuwei. |
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