摘要
通过实验研究了孕穗期叶温与水分条件及产量结构之间的关系。结果表明:气温高于叶温;不同处理蒸散量的日变化主要与叶温的日变化趋势基本一致。对不同水分处理,土壤含水量越少,蒸散量也相对较少,叶温也就越高;叶水势可以反映作物水分状况,叶温越高,叶水势越低。叶温和蒸散量反映植株水分状况的时间应在11:00—15:00时,这主要和太阳辐射的日变化有关。通过对产量结构的分析,得出水孕穗期受到一定的水分胁迫对穗重影响最大,其次是结实率和穗粒数,对穗长没有影响。第一批处理约有一天的水分胁迫,第二批处理也只有几个小时的水分胁迫,叶温比对照高1.4～1.8℃,对穗重、结实率和穗粒数都有不同程度的影响,说明水稻孕穗期对水分胁迫较敏感。
The relations between leaf temperature with water condition and yield composition in boot stage on rice were studied in this paper. It shows that the air temperature is higher than leaf temperature. The volume of transpiration has the same trend with leaf temperature. The lower leaf water potential lead higher leaf temperature and lower transpiration with the different water condition. Water potential of leaf reflected Crop water condition. The lower water potential of leaf the higher leaf temperature. Crop water condition is suggested by leaf temperature and the volume of transpiration from 11：00 to 15：00 with the solar radiation variation. The weight of per spike has a maximum reduction by water stress at this stage, the following reductions are seed rate and the seed number per spike, and the spike length is the same as control by the treatment time of one day and few hours to the first and the second treatment respectively, and the leaf temperature is higher 1.4～1.8℃ than control. The boot stage was sensitive to water stress.
出处
《中国农学通报》
CSCD
2006年第3期214-216,共3页
Chinese Agricultural Science Bulletin
基金
校青年基金项目"水旱稻冠气温差与水分之间的关系"(200024)。
关键词
水稻
叶温
水分条件
孕穗期
Rice, Leaf temperature, Water condition, Boot stage
