摘要
以黑龙江省第二积温带的巴彦、佳木斯、林甸和宁安4个代表市县2004年至2013年间4～5月份日平均地温为基础数据，结合地温的变化规律和玉米种子适宜萌发温度，确定该积温带的玉米播种日期。结果表明，日平均地温均随着日期增加在波动中增长，4月1～9日，地温增长比较稳定，曲线波动幅度相对较小；4月10～23日，曲线波动幅度最大。10年间地温稳定通过6℃、7℃、8℃、9℃和10℃的平均日期分别为4月6日、4月13日、4月18日、4月19～27日，年际间差异明显。此积温带的玉米最早播种期为4月18日，适宜播期为4月23日至5月5日。
Abstract
The changes of earth temperature in 5-10 cm soil layer in April and May were analyzed in the sec?ond accumulated temperature zone of four representative cities and counties in Heilongjiang province from 2004 to 2013. The sowing time in this area was defined considering suitable maize seed germination temperature and chang?es of soil temperature. The results showed that daily average earth temperature increased in fluctuation with the time. It increased steadily from 1st to 9th in April, and a great fluctuation happened from 10th to 23rd in April. The earth temperature reached 6℃, 7℃, 8℃, 9℃and 10℃steadily on April 6th, 13rd, 18th, 19th and 27th, respectively, and the annual greater fluctuation was obtained. So, the earliest maize sowing time was April 18th, and the suitable sow?ing date was from April 23rd to May 5th.
基金项目
国家粮食丰产科技工程项目(2011BAD16B11-01SF04)
黑龙江省科技攻关项目(GA12B101-02)
NETL
NSTL
维普
万方数据