摘要
分析长江中下游地区1985年至2004年间每年7月中旬至8月中旬气温变化，结果显示，南京和安庆地区每隔1～2年就会出现持续5d以上日最高温度高于35℃的高温。可见，这一地区7月中旬至8月中旬出现高温为害水稻的几率较高，因此应该考虑调节播种时间以使其抽穗开花期尽量避开这一时期。采用人工气候箱观测水稻抽穗期在高温条件下的花粉活力、萌发、结实情况，结果表明，温度越高、胁迫时间越长，花粉活力和花粉的萌发率越低，最终导致结实率下降。
Changes of temperatures from mid-July to mid-August for twenty years （ 1985 - 2004） in the middle and lower reaches of Yangtze River were analyzed. A regularity was found that duration of diurnal maximum temperature over 35℃for over 5 d occurred in every one or two years in Nanjing and Anqing. Rice planted in this area was in heading stage from mid-July to mid-August. According to the experimental results conducted in this study on rice in heading stage, the higher the temperature and the longer the high temperature stress, the lower the pollen vigor and the germination percentage, therefore, the less the seed setting rate and the yield. Connecting above points together, it could be inferred that the probability of high temperature hazard on rice from mid-July to mid-August was pretty high. Sowing date should be arranged to make heading stage avoid this period.
出处
《江苏农业学报》
CSCD
北大核心
2007年第1期1-4,共4页
Jiangsu Journal of Agricultural Sciences
基金
江苏省自然科学基金重点项目(BK2004002)
关键词
水稻
高温
花粉活力
结实率
rice
high temperature
pollen vigor
seed setting rate
