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当前位置: 首页 > 文章 > 遮阴对堇叶紫金牛光合特性和叶绿素荧光参数的影响 应用生态学报 2014,25 (7) 1940-1948
Position: Home > Articles > Effects of shade on photosynthetic characteristics and chlorophyll fluorescence of Ardisia violacea Chinese Journal of Applied Ecology 2014,25 (7) 1940-1948

遮阴对堇叶紫金牛光合特性和叶绿素荧光参数的影响

作  者：
张云;夏国华;马凯;李根有;代英超;严彩霞
单  位：
浙江农林大学林业与生物技术学院;杭州市旅游职业学校;浙江农林大学风景园林与建筑学院
关键词：
堇叶紫金牛;遮阴;光合特性;叶绿素荧光
摘  要：
堇叶紫金牛是一种特产于浙江和台湾的珍稀濒危植物.为了解堇叶紫金牛对光的需求及适应规律,本文研究了不同光照强度(遮阴率90%、60%、25%及全光照)对其光合特性和叶绿素荧光参数的影响.结果表明:全光照条件下堇叶紫金牛净光合速率(Pn)、气孔导度(gs)日变化曲线均呈"双峰型",出现光合"午休现象",而遮阴处理下均呈"单峰型".随遮阴率的增加,堇叶紫金牛叶片Pn和表观量子效率(AQY)均呈先升高后降低的趋势,光饱和点(LSP)和光补偿点(LCP)均呈降低趋势,gs、蒸腾速率(Tr)、原初光能转换率(Fv/Fm)和PSⅡ潜在活性(Fv/Fo)均呈升高趋势.遮阴造成叶绿素总量、类胡萝卜素(Car)含量的增加和Chl a/b的降低.遮阴率25%条件下,堇叶紫金牛根冠比(R/T)和比叶重(LMA)均达到最大值.堇叶紫金牛对不同光环境表现出较强的适应性和可塑性,表明光照不足不是其野外种群致濒的主要原因.
译  名：
Effects of shade on photosynthetic characteristics and chlorophyll fluorescence of Ardisia violacea
作  者：
ZHANG Yun;XIA Guo-hua;MA Kai;LI Gen-you;DAI Ying-chao;YAN Cai-xia;School of Landscape Architecture,Zhejiang Agricultural and Forestry University;School of Forestry and Biotechnology,Zhejiang Agricultural and Forestry University;Nurturing Station for State Key Laboratory of Subtropical Silviculture,Zhejiang Agricultural and Forestry University;Hangzhou Tourism Vocational School;
关键词：
Ardisia violacea;;shade;;photosynthetic characteristics;;chlorophyll fluorescence.
摘  要：
Ardisia violacea is one of the rare and endangered species,and distributes only in Zhejiang and Taiwan Provinces in China. In order to understand the light requirement and adaptability of A.violacea,the effects of different light intensities( shading rate of 90%,60%,25%,and the full light) on leaf photosynthetic characteristics and chlorophyll fluorescence of A. violacea were studied.The photosynthetic rate( Pn) and stomatal conductance( gs) of A. violacea varied as a bimodal curve with a ‘midday depression'phenomenon in full bright light,and as a unimodal curve in the shading treatments. With the increasing shading rate,the Pnand apparent quantum efficiency( AQY) first increased,and then decreased,the light compensation point( LCP) and light saturation point( LSP)decreased,and the gs,transpiration rate( Tr),original light energy conversion( Fv/Fm) and potential activity of PSⅡ( Fv/Fo) increased. The total quantity of chlorophyll and the carotenoid( Car)content increased,and Chl a /b decreased under shading conditions. When the shading rate was25%,the specific leaf mass( LMA) and root to shoot( R /T) ratio of A. violacea reached the maximum. A. violacea possessed a strong flexibility to different light environments,suggesting that light could not be the main limiting factor for natural regeneration of A. violacea populations.

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