论文部分内容阅读
本文测定了三个周期水分和热胁迫处理对杉木、马尾松和北美乔柏苗木叶绿素荧光的影响。结果表明:三个树种的可变荧光与最大荧光之比值(Fv/Fm)对水分胁迫的反应不同。水分胁迫处理后北美乔柏的(Fv/Fm)值大大降低,而杉木的(Fv/Fm)值只有轻微下降,马尾松的(Fv/Fm)值则没有显著变化。实验结果还表明:热胁迫处理对三个树种的(Fv/Fm)值都有显著影响。就三个水分和热胁迫周期而言,研究发现:在每个水分和热胁迫周期结束时测定的杉木和马尾松(Fv/Fm)值没有显著差异。但随着胁迫时间的延长,北美乔柏的(Fv/Fm)值显著下降。图4表4参20。
This paper measured the chlorophyll fluorescence of Chinese fir, Pinus massoniana and P. arborvitae under three cycles of water stress and heat stress. The results showed that the ratio of variable fluorescence to maximum fluorescence (Fv / Fm) of the three species had different responses to water stress. The Fv / Fm values of Ficus pumila decreased significantly after water stress treatment, while the Fv / Fm values of Fir (Fv / Fm) decreased only slightly but the Fusarium pine (Fv / Fm) values did not change significantly. The experimental results also showed that heat stress treatment had significant effects on the (Fv / Fm) values of the three tree species. For the three moisture and heat stress cycles, the study found no significant differences in Fv / Fm values measured at the end of each water and heat stress cycle. However, the Fv / Fm value decreased significantly with the prolonging of stress time. Figure 4 Table 4 Reference 20.