| 令狐克念,黄 郎,代 丽,陈 锐,杨焱冰.遮阴对安龙油果樟叶片光合特性的影响[J].林业调查规划,2026,51(3):24-30 |
| 遮阴对安龙油果樟叶片光合特性的影响 |
| Effects of Shading on Photosynthetic Characteristics of Syndiclis anlungensis Leaves |
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| DOI： |
| 中文关键词: 安龙油果樟 遮阴 光合特性 CO2浓度 光适应机制 |
| 英文关键词: Syndiclis anlungensis shading photosynthetic characteristic CO2 concentration light adaptation mechanism |
| 基金项目:贵州省科技计划项目(黔科合基础-ZK〔2022〕一般240);贵州省科技计划项目(黔科合服企〔2023〕009). |
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| 中文摘要: |
| 为探讨不同遮阴程度对安龙油果樟光合特性的影响,以安龙油果樟2年生幼苗为研究对象,经70%(T1)、50%(T2)、30%(T3)、20%(T4)全光照4个不同遮阴处理6个月后,对其光合指标进行测定与分析。结果显示,中午12∶00前是安龙油果樟进行光合作用的主要时段,上午时段T1处理的净光合速率显著高于其他处理,而下午时段则以T2处理表现最佳;T1和T2处理净光合速率下降主要受非气孔因素调控,表现为胞间CO2浓度降低而气孔导度升高;T3和T4处理则表现为典型的气孔限制特征,气孔导度和胞间CO2浓度呈同步下降趋势。随着遮阴程度加深,幼苗通过显著提高表观量子效率来增强弱光捕获能力;增加CO2浓度可提高弱光条件下(T2~T4处理)的光合效率。在自然界的光照条件下,安龙油果樟常会面临强光或弱光的胁迫,适度的遮阴措施能显著促进其生长。此外,通过施加CO2气肥,可有效增强安龙油果樟对弱光环境的适应能力,从而为其健康生长提供有力保障。 |
| 英文摘要: |
| In order to explore the effect of different shading degree on the photosynthetic characteristics of Syndiclis anlungensis, 2-year-old seedlings of Syndiclis anlungensis were used as test materials, and their photosynthetic indexes were measured and analyzed after 6 months of 4 different shading treatments, namely, 70%(T1), 50%(T2), 30%(T3), and 20%(T4) of full-light illumination. The results showed that the period before 12∶00 was the main time for photosynthesis in S.anlungensis. In the morning, the net photosynthetic rate under T1 treatment was significantly higher than those under the other treatments, whereas in the afternoon, T2 treatment exhibited the best performance. The decline in net photosynthetic rate under T1 and T2 treatments was primarily regulated by non-stomatal factors, characterized by a decrease in intercellular CO2 concentration and an increase in stomatal conductance. In contrast, T3 and T4 treatments exhibited typical stomatal limitation characteristics, with stomatal conductance and intercellular CO2 concentration showing a synchronous decreasing trend. As shading intensity increased, seedlings significantly enhanced their weaklight capture capacity by increasing apparent quantum efficiency. Increasing CO2 concentration improved photosynthetic efficiency under low - light conditions (T2-T4 treatments). Under natural light conditions, S.anlungensis often faced stress from either high light or low light, and moderate shading could significantly promote its growth. Furthermore, the application of CO2 fertilization could effectively enhance the adaptability of S.anlungensis to weak-light environments, thereby providing strong support for its healthy growth. |
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