摘要
人工霜箱的控制试验表明 ,冬小麦叶片冻结后是否受到伤害取决于最低叶温。拔节后第 1～2 0天 ,叶片的霜冻临界叶温由 - 6.5℃提高到 - 4 .5℃。幼穗是否受伤与最低叶温的关系相当密切 ,同期幼穗轻度伤害的临界叶温由 - 8.3℃提高到 - 3.9℃ ,幼穗严重伤害的临界叶温由 - 8.3℃提高到- 5.4℃。建立了叶受害、穗轻伤、穗重伤的临界叶温随拔节后天数而变的数学表达式 。
The relationship between frost damage and leaf temperature of winter wheat after jointing stage was researched by controlled experiment with artificial frost ap paratus. The result indicated that it was determined by the minimum leaf tempera ture whether suffers from frost injure after the leaf freezed. within 1～20 day s after jointing stage, the critical leaf temperature for frost increased from -6. 5℃ to -4.5℃, And it was also related closely to the minimun leaf temperature w hether the young spike was injured. The critical leaf temperature for young spik e bein g lightly elevates from -8.3℃ to -3.9℃, and that for young spike being severel y damaged rised from -8.3℃ to -5.4℃. Based on this, the mathematical formulas, which describe the relationship of critical leaf temperature and days after joi nting stage for leaf suffering from frost injury, spike being damaged lightly and spike being damaged severely , were established, that could provide judgement standard for frost forecast and defence.
出处
《作物学报》
CAS
CSCD
北大核心
2000年第6期707-712,共6页
Acta Agronomica Sinica
基金
"九五"国家科技攻关项目 !( 96-0 2 0 -0 1 -0 8)
