论文部分内容阅读
对青海共和盆地4个林龄乌柳的水分生理特征及叶性状参数进行了对比分析.结果表明:不同林龄乌柳的相对水分亏损无显著差异.37年生乌柳的水势日均值显著低于其他3个林龄,4和11年生乌柳的水势日均值显著低于25年生乌柳.4年生乌柳的失水率显著低于其他3个林龄,25年生乌柳的失水率显著低于11年生乌柳.4年生乌柳比叶面积(SLA)显著低于其他3个林龄,其水分利用效率较高.11年生乌柳单位质量叶氮(Nmass)显著高于其他3个林龄,25年生乌柳Nmass显著高于37年生乌柳,11和25年生乌柳的光合能力较强.11年生乌柳单位质量叶磷(Pmass)显著高于25和37年生乌柳,4年生乌柳Pmass显著高于25年生乌柳.各林龄乌柳的Nmass/Pmass为5.16～6.28,其中25年生乌柳Nmass/Pmass显著高于4和11年生乌柳.4个林龄乌柳Nmass与Pmass呈显著正相关,Pmass与Nmass/Pmass和林龄呈极显著负相关,Nmass/Pmass与林龄呈显著正相关.不同生长阶段乌柳的生态适应对策不同.
The results showed that there was no significant difference in the relative water deficit of Salix psammophila from different age groups.The average daily water potential of Salix psammophila in 37-year-old was significantly lower than that of the control The average daily water potential of 4 and 11-year-old willow trees was significantly lower than that of the 25-year-old willow trees at the other three ages.The water loss rate of 4-year-old Salix psammophila was significantly lower than that of the other three years, and the water loss rate of 25- The leaf area under 4 years old was significantly lower than that at the other 3 years, and its water use efficiency was higher. The Nmass per unit weight of 11-year-old was significantly higher than that of the other 3 The Nmass of 25-year-old Wu-liu was significantly higher than that of the 37-year-old Wu-liu and the photosynthetic capacity of 11-and 25-year-old Wulu was significantly higher than that of the 25- and 37-year- The Pmass of Picea crassifolia was significantly higher than that of the 25-year-old Picea meyeri.The Nmass / Pmass of Picea meyeri at each age was 5.16 ~ 6.28, and the Nmass / Pmass of 25-year-old Pseudoalbums sibirica was significantly higher than that of 4 and 11-year- There was a significant positive correlation between Nmass and Pmass, Pmass and Nmass / Pmass and age were significantly negatively correlated, Nmass / Pmass and age were significantly positively correlated. With different growth stages Salix ecological adaptation strategy.