| 光照强度对垂盆草建植期生长和生理特性的影响 |
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| 引用本文： | 张蕾,江海东.光照强度对垂盆草建植期生长和生理特性的影响[J].草业科学,2013,30(3):447-451. |
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| 作者姓名： | 张蕾 江海东 |
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| 作者单位： | 南京农业大学园艺学院,江苏南京210095;东营区区直机关行政事务管理局,山东东营257091;南京农业大学园艺学院,江苏南京210095;南京农业大学作物生长调控农业部重点开放实验室,江苏南京210095 |
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| 摘 要： | 通过人工遮阴处理，研究了不同光照强度（分别为全光照的100%、77%、47%和23%）对垂盆草（Sedum sarmentosum）建植期生长和生理特性的影响。结果表明，在试验所设的光照范围内，垂盆草均可正常生长，并表现出较强的形态可塑性，随着光照减弱，萌芽增多，枝条变长，节间距变大，直径变小，叶片层数增多。与全光照相比，遮阴促进了植株干物质的积累，并通过生物量分配格局的改变，将更多的能量用于支持器官茎的生长。这一系列的改变均有利于植株获得更多的光能来适应弱光环境。此外，遮阴使植株含水量和可溶性蛋白含量上升，可溶性糖含量下降，光合色素含量仅在23%的光照下显著增多，但此时根系发育受到严重影响，植株生物量与47%光照相比有所下降。综上所述，通过适度遮阴可加快垂盆草成坪速度，但建议光照强度不低于23%。
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| 关 键 词： | 垂盆草 光照强度 建植期 生长 生理特性 |
Effects of light intensity on growth and physiological characteristics of Sedum sarmentosum during establishment stage |
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| ZHANG Lei,JIANG Hai dong.Effects of light intensity on growth and physiological characteristics of Sedum sarmentosum during establishment stage[J].Pratacultural Science,2013,30(3):447-451. |
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| Authors: | ZHANG Lei JIANG Hai dong |
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| Abstract: | Effects of different light intensities (100%, 77%, 47% and 23% sunlight) on growth and physiological characteristics of Sedum sarmentosum during establishment stage were studied through artificially shading treatment. The results indicated that within the light intensity range in this experiment, S.sarmentosum could grow normally and showed good morphological plasticity. Low light intensity induced more new shoots and leaves, smaller diameter, longer shoot and internode. Compared with 100% sunlight, shading promoted plant dry matter accumulation and more energy distribution to the growth of stem. All these changes help capture more light to adapt to low light enviorenment. In addition, shading increased plant water content and soluble protein content, and reduced soluble sugar content. Photosynthetic pigment content increased significantly only on 23% sunlight condition which caused dramatic negative influence to root development, and slight decrease of plant dry weight contrasting to 47% sunlight. It suggested that moderate shading could accelerate covering rate in establishment, but light intensity lower than 23% was not recommended. |
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| Keywords: | Sedum sarmentosum light intensity establishment stage growth physiological characteristics |
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