| Spatiotemporal changing characteristics of agricultural climate resources in northern dry crops farming area |
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| DOI：10.7606/j.issn.1000-7601.2014.03.040 |
| Key Words: agricultural climate resources climate change spatiotemporal change northern dry crops farming area |
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| Abstract: |
| Based on the meteorological observed data from 317 climate stations during 1961 to 2010 in northern dry crops farming area, analyzed and compared the change characteristics of agricultural climate resources in 1961 to 1990 (periodⅠ) and 1991 to 2010 (period Ⅱ). The resuls showed that: The sunshine hours in total region presented a decreasing trend on the whole, compared with periodⅠ
, the average has been reduced 92.9h in period Ⅱ. The precipitation in whole region showed an increasing trend in west part and a decreasing trend in east part during recent 50 years. As compared with periodⅠ, the mean annual temperature has been increased 0.97℃ in period Ⅱ，which was higher than the national average level. Besides, duration of daily mean temperature steadily passed 0℃ and 10℃ showed a generally increasing trend, the ≥0℃ active accumulated temperature in the growth periods of chimonophilous crops and the ≥10℃ active accumulated temperature in the growth periods of thermophilic crops increased averagely by 198.6℃ and 197.3℃，respectively. The climate change in whole research region, presented a warm and wet tendency in the west, but warm and dry tendency in the east. |
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