摘要
为了应对气候变化,掌握玉米播种出苗期的温度特性,科学调整玉米播种期提供依据,采用分期播种方法,研究温度变化对玉米出苗速率的影响。结果表明,随着春季气温的升高,玉米出苗速率加快。玉米出苗速率与4月中旬—6月上旬平均气温存在对数函数关系,与≥12.0℃有效积温存在线性函数关系,出苗天数与活动积温存在指数函数关系。稳定通过12.0℃为玉米播种初始温度,14.0～18.0℃为较适宜温度,18.0℃以上为播种适宜温度。耕层温度与气温对出苗速率的影响相同。播种期初始温度应从稳定10.0℃调整至稳定12.0℃为宜。
In order to cope with climate change, master the temperature characteristics on the maize emergence date, and provide evidence for scientific adjustment of maize sowing date, the author analyzed the influence of temperature changes on the seedling emergence rate of maize, applied the method of sowing in different period. The results showed that the seedling emergence rate of maize increased with the temperature raising. There was a logarithm function relation between the emergence rate and average temperature from the middle the days of April to the first ten days of June. There was a linear correlation between the emergence rate and effective accumulated temperature above 12.0℃ . There was an exponential regression correlation between the emergence days and active accumulated temperature. For maize sowing, steadily pass 12℃ was the initial temperature, 14.0-18.0℃ was the more suitable temperature, above 18.0℃ was the most suitable temperature. And the same effect rule of the topsoil temperature did to emergence rate. The sowing initial temperature steadily pass from 10℃ to 12℃ was appropriate.
出处
《中国农学通报》
CSCD
2013年第9期70-74,共5页
Chinese Agricultural Science Bulletin
基金
辽宁省科技厅农业攻关项目"主要农业气象灾害发生规律及预警和评估机制研究"(2011210002)
关键词
玉米
播种期
出苗速率
温度
maize
sowing date
seedling emergence rate
temperature
