湖南烤烟适宜移栽期分析

利用湖南省97个气象站1961—2005年3—4月逐日气温和地形高程数据,采用农业气候统计方法分析各气象站稳定通过5、8、10℃的初日;采用GIS小网格技术,得到湖南500 m×500 m植烟区域适宜移栽的初日地域分布。结果表明:稳定通过5℃的80%保证率初日以江永县、江华县出现最早,为2月19—22日,湘西高海拔地区及浏阳市东部出现在3月13日以后,其他烟区出现在2月23—3月13日;稳定通过8℃的80%保证率初日湘南大部分烟区在3月23—26日,湘西中海拔地区及桃源县、临澧县、浏阳市东部大多出现在3月26日—4月1日,湘西高海拔地区为4月7日以后;稳定通过10℃的80%保证率初日湘中以南烟区为3月30日—4月1日,湘西低海拔地区以及邵阳市、郴州市中部等地在4月1—5日,湘西中高海拔地区出现在4月7日以后。

Transplanting period suitable for flue-cured tobacco in Hunan province

According to the meteorological data in March and April recorded in 97 stations from year 1961 to 2005 and the digital elevation model data in Hunan province,regional distribution of the first date on which the daily temperature steadily pass 5,8 or 10 ℃ which is suitable for flue-cured tobacco transplanting was analyzed by means of 500 m×500 m small grid interpolation based on GIS technology.The results are as follows: The first date in a year when 80 percent of daily temperature steadily pass 5 ℃ first appears from Feb.19 to 22 in Jiangyong county and Jianghua county,then appears after Mar.13 in the high altitude area of Western Hunan and eastern Liuyang and from Feb.23 to Mar.13 in other tobacco areas.The first date in a year when 80 percent of daily temperature steadily pass 8 ℃ appears from Mar.23 to 26 in most areas of Southern Hunan,from Mar.26 to Apr.1 in the middle altitude area of Western Hunan,and in Taoyuan county,Linli county and eastern Liuyang city,and after Apr.7 in the high altitude area of Western Hunan.The first date in a year when 80 percent of daily temperature steadily pass 10 ℃ appears from Mar.30 to Apr.1 in the south area of middle Hunan,from Apr.1 to 5 in the low altitude area of Western Hunan,and in Shaoyang and middle Chenzhou,and after Apr.7 in the middle and high altitude area of Western Hunan.