【摘要】 小麦适期播种不仅是达到全苗壮苗的关键,还有利于小麦健壮生长发育,是提高小麦单产的重要措施。本试验研究了不同播期和播量条件下小麦冠层底部光合有效辐射(TPAR)、叶面积指数(LAI)、冠层截获的光合有效辐射(IPAR)等的变化及播期对冬小麦产量的影响。结果表明,叶面积指数和冠层截获的光合有效辐射随小麦播种时间的推迟而降低,小麦冠层底部的光合有效辐射随小麦播种时间的推迟而增大。小麦冠层截获的光合有效辐射与叶面积指数呈显著正相关,相关系数为0.756;冠层底部的光合有效辐射与叶面积呈显著负相关,相关系数为-0.872。小麦产量虽然随播期的推迟呈递减趋势,但10月20日之前播种的小麦产量间无显著差异。因此,在冬小麦和夏玉米一年两熟区,可相应推迟小麦的播种时间,尽量延长上茬玉米的生长期,以实现两茬作物的均衡增产。更多还原

【Abstract】 Suitable sowing time of winter wheat is a key to full and strong development of young plants and high yield. Transmitted photo-synthetically active radiation (TPAR), leaf area index (LAI), intercepted photo-synthetically active radiation (IPAR) and yield of winter wheat differ with sowing date and sowing rate. Experiment results indicate that while LAI and IPAR decrease with late sowing date, TPAR, on the other hand, increases with late sowing date. IPAR and LAI have significantly positive correlation with a correlation coefficient of 0.756. However, TPAR and LAI have significantly negative correlation with a correlation coefficient of -0.872. Wheat yield decreases with the delayed sowing date. However, sowing seeds before October 20 minimizes differences in wheat yield with different sowing date. Yield is enhanced via rational postponement of sowing date of wheat. It as well extends development period of corn in winter wheat-summer corn crop rotation system.更多还原