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作 者 ：吴统贵;袁涛;王宗星;吴明;虞木奎*;孙海菁

期 刊 ：植物研究 2012年 32卷 5期 页码：615-620

关键词：海滨木槿；蜡杨梅；光合特性；海水水淹胁迫；

Keywords:Hibiscus hamabo, Myrica cerifera, photosynthetic characteristics, tidal waterlogging,

摘 要 ：滨海滩涂消浪林是沿海防护林体系的重要组成部分，在消浪护岸、促淤保滩、防御来自海洋自然灾害等方面具有不可代替的作用。本研究以中亚热带两种木本消浪植物海滨木槿（Hibiscus hamabo）和蜡杨梅（Myrica cerifera）为研究对象，模拟海水水淹，系统研究了不同海水水淹程度下两木本植物光合特性的响应规律。结果发现，随着水淹胁迫的增加，海滨木槿最大净光合速率逐渐下降、光补偿点逐渐增加，表观量子效率在7、21天时先降低后增加，后期呈现逐渐降低的趋势，说明胁迫初期通过增加光合利用率来适应水淹胁迫，暗呼吸速率在7、21天逐渐增加，而在42、70天时W8（水淹8 h，水深45 cm）处理显著小于其它处理，说明W8处理已显著影响了该树种的光合特征；蜡杨梅最大净光合速率、表观量子效率表现为逐渐降低的趋势，而光补偿点和暗呼吸速率则逐渐增加，42天后W6（水淹6 h，水深35 cm）、W8处理各项指标显著小于其它处理。经多元方差分析发现，水淹21天内海滨木槿的光合指标要显著好于蜡杨梅，而在42天后则基本相同；海滨木槿在水淹胁迫6 h内可以生长，而蜡杨梅则只能在4 h内，这可为消浪林构建提供理论依据。

Abstract:Wave break forest, which is important for preventing disasters from ocean, is a key component of shelterbelt forests systems in coastal area. In this paper, the photosynthetic characteristics of Hibiscus hamabo and Myrica cerifera were determined under different seawater stress simulating tidal waterlogging. The results showed that, with the seawater stress increasing, the maximum photosynthesis rate (P_max) decreased gradually, while the light compensate point (LCP) increased, the apparent quanta yield (AQY) decreased first and then increased in the 7^th, 21^th day, and then increased in the 42^th, 70^th day, and the dark respiration (R_d) increased, but the value of W8 treatment (waterlogging 8 h with 45 cm depth) was lower than the rest treatments in the 42^th, 70^th day for H.hamabo. The P_max, AQY both increased, and LCP, Rd both decreased for M.cerifera, and significant differences were found between W6 (waterlogging 6 h with 35 cm depth), W8 treatments and the rest treatments for each photosynthetic characteristic in the 42^th, 70^th day. Overall, H.hamabo showed better photosynthetic adaptability than M.cerifera in the 7^th, 21^th day, while this advantage disappeared in the 42^th, 70^th day.

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