| 遮阴和紫外辐射对凤眼莲株型与光合作用的影响 |
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| 引用本文： | 李霞,丛伟.遮阴和紫外辐射对凤眼莲株型与光合作用的影响[J].水利渔业,2011,32(6):38-45. |
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| 作者姓名： | 李霞 丛伟 |
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| 作者单位： | 江苏省农业科学院粮食作物研究所,江苏省优质水稻工程技术研究中心,江苏南京210014 |
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| 基金项目： | 国家科技支撑计划项目，国家自然科学基金项目 |
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| 摘 要： | 采用室外培养,单因子设计,设置紫外辐射（UV-B 100 μW/cm2）、遮阴（光强为自然光的70%）和全自然光3个处理,测定凤眼莲（Eichhornia crassipes）30d处理前后生长势和光合参数的变化。结果表明：（1）凤眼莲是对光因子高度敏感的植物,不同光环境下株型不同;与全自然光处理材料相比,遮阴后增加了...
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| 关 键 词： | 凤眼莲 株型 光合作用 光强 紫外辐射 |
Effects of Shading and UV-B Treatments on Plant Type and Photosynthesis of Eichhornia crassipes |
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| Abstract: | With single-factor experiment designed, the growth potential and photosynthetic parameters of Eichhornia crassipes before and after the treatments were measured outdoors in Nanjing under the treatments of ultraviolet radiation （UV-B 100 μW/cm2）, shading （light intensity： 70% of natural light）, and natural light for 30 d. The research indicated that （1） E.crassipes is a plant species of highly light sensitivity, plant type variable with different luminous environment. Compared with natural light treatment, petiole length of E.crassipes under shading treatment increased, but petiole length decreased under UV radiation, with plant type compact and root length extending. （2） The growth potential of E.crassipes was highly related to light intensity photosynthetic capacity. With light intensity lower, reduction of matter accumulation caused by insufficient light intensity was compensated by increasing MLIA, enhancing stomatic conductance （Gs）, thus increasing net photosynthesis rate （Pn）. Under UV radiation, UV radiation damage to the plants was alleviated by reducing light-absorbing capacity of E.crassipes, consequently decreasing transpiration rate （Tr）, stomatic conductance （Gs） and net photosynthesis rate （Pn）. （3） Two-step approach is to be applied in the artificial culture of E.crassipes, and dry matter accumulation can be significantly increased by increasing light intensity at early stage, and by covering sunshade screen at later stage. |
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| Keywords: | Eichhornia crassipes plant type photosynthesis light intensity ultraviolet radiation |
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