| Spatial-temporal variation of first ≥10℃ date in the past 52 years and its impact on the sowing date of spring maize in northern Xinjiang |
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| DOI：10.7606/j.issn.1000-7601.2017.01.40 |
| Key Words: first ≥10℃ date climate changes northern Xinjiang spring maize sowing date |
| Author Name | Affiliation | | TIAN Yan-jun | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHANG Shan-qing | Urumqi Meteorological Bureau of Xinjiang, Urumqi, Xinjiang 830002, China | | XU Wen-xiu | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHI Juan | College of Grassland and Environment Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| Based on the data collected from 48 meteorological stations in the north area of Xinjiang from 1961 to 2012, the paper analyzed the influence of the first date change of ≥10℃ in recent 52 years on sowing date of spring maize in northern Xinjiang by means of linear regressions，t-test, a linear regression equation and Inverse Distance Weighted of Arcgis 9.3. The results showed that (1) the average first ≥10℃ date moved up on the whole with a trend rate of -0.9 d·10a-1 from 1961 to 2012, specifically, the date was postponed with a trend rate of 4.8 d·10a-1 before 1980s, and then continuous moved up. This advance trend was significantly obvious in 1990s with the trend rate of -13.5 d·10a-1. (2) Sowing date of spring maize was advanced with the effect of climate warming, the average sowing date ranged from March 26th to May 5th in Northern Xinjiang at the beginning of this century. Compared with 1960s, the current sowing date was advanced 10～21 d at the most, and 1～9 d in most counties. With the climate warming continues, average sowing date of spring maize in Xinjiang northern region will be further advanced. |
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