摘要
考察了不同灌溉量条件下 ,冬小麦不同生育时期土壤水分对植株叶片水分状况及生理功能的影响。结果表明 ,从返青至封行前的春生 5叶期期间 ,土壤含水量与植株叶片含水量之间呈负相关关系 ,其中 2 0～ 40 cm深度土壤含水量与叶片含水量之间达到极显著水平 ;从挑旗至蜡熟期 ,土壤含水量与植株叶片含水量之间呈正相关关系 ,其中 0～ 2 0 cm深度土壤含水量与叶片含水量之间达到极显著水平。叶温以适中含水量条件下表现较低 ,当处于极端少水条件下时叶温显著增高 ,在偏多水条件下叶温也呈增高趋势。在孕穗期 ,供水不足使 PS 的原初光能转化效率 Fv/ Fm明显降低 ,而水量偏多未产生显著影响 ;在灌浆盛期 ,供水不足和水量偏多均使 Fv/ Fm显著下降。叶片含水量由 75 %下降到 70 %左右是叶片光合生理活性的一个重要转折点 。
It was studied the effect of soil water content on the leaf water content and the physiological function under different irrigation levels. It indicated that the soil water content(SWC) had negative relation to the leaf water content(LWC) from returning green stage to enveloping the row stage, and it reached significant difference level between SWC from 20 to 40 cm and LWC. The SWC had positive relation to the LWC from flag leaf appearance to the dough stage, and it reached significant difference level between SWC from 0 to 20 cm and LWC. The leaf temperature (Tl)under the middle level water content was the lowest, the Tl improved significantly under dry conditions, and it also had heighten tendency under the water over-saturation level. It decreased significantly the value of the changeable fluorescence(Fv) to the maximum fluorescence(Fm) of PSⅡunder water deficiency conditions at booting stage, but it had no significant influence under the water over-saturation condition. It decreased significantly the value of Fv to Fm of PSⅡunder water deficiency and the water over saturation condition at the grain filling stage. It was an important turning point of the leaf photosynthesis and physiological activity when the leaf water content dropped from 75 percent to 70 percent, and it should be done as the important reference for judging the leaf water content threshold value.
出处
《麦类作物学报》
CAS
CSCD
2001年第4期42-47,共6页
Journal of Triticeae Crops
基金
北京市科委重点科技攻关资助项目 ( 95 2 36 0 10 0 1)
关键词
土壤水分
小麦
叶片含水量
叶温
PSⅡ原初光能转化效率
Soil water content
Leaf water content
Leaf temperature
Original light energy transform efficiency of PSⅡ
