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宋绪忠, 杨华, 余海珍. 两种光环境下泰顺杜鹃和鹿角杜鹃光合特性的日变化[J]. 浙江林业科技, 2023, 43(2): 17-21. DOI: 10.3969/j.issn.1001-3776.2023.02.003
引用本文: 宋绪忠, 杨华, 余海珍. 两种光环境下泰顺杜鹃和鹿角杜鹃光合特性的日变化[J]. 浙江林业科技, 2023, 43(2): 17-21. DOI: 10.3969/j.issn.1001-3776.2023.02.003
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SONG Xu-zhong, YANG Hua, YU Hai-zhen. Daily Change of Photosynthetic Properties of Rhododendron taishunense and R. latoucheae under Different Light Condition[J]. Journal of Zhejiang Forestry Science and Technology, 2023, 43(2): 17-21. DOI: 10.3969/j.issn.1001-3776.2023.02.003
Citation: SONG Xu-zhong, YANG Hua, YU Hai-zhen. Daily Change of Photosynthetic Properties of Rhododendron taishunense and R. latoucheae under Different Light Condition[J]. Journal of Zhejiang Forestry Science and Technology, 2023, 43(2): 17-21. DOI: 10.3969/j.issn.1001-3776.2023.02.003
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两种光环境下泰顺杜鹃和鹿角杜鹃光合特性的日变化

Daily Change of Photosynthetic Properties of Rhododendron taishunense and R. latoucheae under Different Light Condition

    摘要
  • 摘要: 以5 年生盆栽泰顺杜鹃Rhododendron taishunense 和鹿角杜鹃Rhododendron latoucheae 为材料，使用LI-6400 便携式光合作用仪，于2021 年8 月下旬晴天6:00—18:00 测定85%遮荫和全光照下泰顺杜鹃和鹿角杜鹃的光合特 性并对其进行研究。结果表明：（1）在两种光环境下的泰顺杜鹃和鹿角杜鹃的Pn 日变化均表现为“单峰”型。 6:00—10:00 时，泰顺杜鹃全光照下的净光合速率（Pn）大于遮荫下的，到了12:00—16:00 时则相反，全光照下 的Pn 比遮荫下的小，18:00 时遮荫的泰顺杜鹃接受到的光合有效辐射（PAR）只有3.8 μmol CO2·m-2·s-1，Pn 降 为－0.4 μmol CO2·m-2·s-1，PAR 大于1 154 μmol CO2·m-2·s-1 后泰顺杜鹃需要适当的遮荫；除了18:00 时，鹿角杜鹃 全光照的Pn 都大于遮荫下的，也比全光照泰顺杜鹃的Pn 大。（2）在两种光环境下，泰顺杜鹃和鹿角杜鹃的蒸 腾速率（Tr）日变化也表现为“单峰”型，并且泰顺杜鹃的Tr 都小于鹿角杜鹃的Tr，遮荫弱光造成2 种杜鹃的 Tr 下降。（3）在两种光环境下，泰顺杜鹃的气孔导度（Gs）均为先逐渐升高后下降的趋势，呈“单峰”型。（4） 在两种光环境下，泰顺杜鹃和鹿角杜鹃的胞间CO2 浓度（Ci）日变化表现基本上均呈先逐渐下降然后再升高的趋 势，但总体变化比较平缓，除了全光照下的泰顺杜鹃，其它的处理均在18:00 时达到最高值。（5）泰顺杜鹃的气 孔限制值（Ls）在全光照下呈“单峰”型，在遮荫下呈“双峰”型；鹿角杜鹃全光照下呈“双峰”型，在遮荫下 呈“单峰”型。（6）泰顺杜鹃和鹿角杜鹃的叶绿素相对含量均表现为遮荫下的叶绿素相对含量高于全光照下的鹿 角杜鹃，并且在两种光环境下鹿角杜鹃的叶绿素相对含量都高于泰顺杜鹃的；在全光照下泰顺杜鹃和鹿角杜鹃的 叶片均表现为发黄，叶绿素含量降低，为了维持其生长健康，夏季应当适当遮荫，秋季及时撤除遮荫网。

     

    Abstract: In May 2021, five-year potted Rhododendron taishunense and R. latoucheae were treated under 85% shade and full light in nursery of Zhejiang Academy of Forestry, Hangzhou, and photosynthetic properties were measured by LI-6400 portable photosynthesize during 6:00-18:00 in late August 2021. The results showed that daily variation of Pn of two species showed a "single peak" under two light conditions. The Pn of R. taishunense under full light between 6:00 and 10:00 was greater than that under shade, but smaller than that under shade at 12:00-16:00. At 18:00, the PAR of R. taishunense received only 3.8 μmol CO2/m2/s, and Pn decreased to -0.4 μmol CO2/m2/s. It showed that R. taishunense needed proper shade when PAR was more than 1 154 μmol CO2/m2/s. Except at18:00, Pn of R. latoucheae under full light was larger than that under shade, and also larger than that of R. taishunense under full light. The daily variation of Tr of two species also showed a "single peak" under the two light conditions. Tr of R. taishunense was smaller than that of R. latoucheae under two light conditions. Shading caused Tr decline of 2 species. Under the two light conditions, Gs of R. taishunense gradually increased and then decreased, showing a "single peak". Under the two light conditions, the daily variation of Ci of two species showed a trend of gradual decline and then increase, but the overall change was relatively gentle, except for R. taishunense under full light, other treatments all reached the maximum value at 18:00. Ls of R. taishunense showed "single peak" under full light and "double peak" under shade. R. latoucheae show a "double peak" under full light and a "single peak" under shade. The relative content of chlorophyll of 2 species showed that the relative content of chlorophyll under shade was higher than that under full light, and the relative content of chlorophyll of R. latoucheae was higher than that of R. taishunense under both light environments. Leaves of two species showed yellow and chlorophyll contents decreased.

     

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