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

遮阴对堇叶紫金牛光合特性和叶绿素荧光参数的影响

张云^1,2,3,夏国华^2,3**,马凯⁴,李根有²,代英超²,严彩霞^1，2

(¹浙江农林大学风景园林与建筑学院，浙江临安 311300； ^2浙江农林大学林业与生物技术学院，浙江临安 311300； ^3浙江农林大学亚热带森林培育国家重点实验室培育基地，浙江临安 311300； ⁴杭州市旅游职业学校，杭州 310052)

出版日期:2014-07-18 发布日期:2014-07-18

Effects of shade on photosynthetic characteristics and chlorophyll fluorescence of Ardisia violacea.

ZHANG Yun^1,2,3, XIA Guo-hua^2,3, MA Kai4, LI Gen-you², DAI Ying-chao²， YAN Cai-xia^1,2

(¹School of Landscape Architecture, Zhejiang Agricultural and Forestry University, Lin’an 311300, Zhejiang, China; ²School of Forestry and Biotechnology, Zhejiang Agricultural and Forestry University, Lin’an 311300, Zhejiang, China; ³Nurturing Station for State Key Laboratory of Subtropical Silviculture, Zhejiang Agricultural and Forestry University, Lin’an 311300, Zhejiang, China; ⁴Hangzhou Tourism Vocational School, Hangzhou 310052, China)

Online:2014-07-18 Published:2014-07-18

摘要/Abstract

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(P_n)、气孔导度(g_s)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P_n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，g_s、蒸腾速率(T_r)、原初光能转换率(F_v/F_m)和PSⅡ潜在活性(F_v/F_o)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.

Abstract: 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 (P_n) and stomatal conductance (g_s) 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 P_n and apparent quantum efficiency (AQY) first increased, and then decreased, the light compensation point (LCP) and light saturation point (LSP) decreased, and the g_s, transpiration rate (T_r), original light energy conversion (F_v/F_m) and potential activity of PSⅡ (F_v/F_o) increased. The total quantity of chlorophyll and the carotenoid (Car) content increased, and Chl a/b decreased under shading conditions. When the shading rate was 25%, 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.

张云1,2,3,夏国华2,3**,马凯4,李根有2,代英超2,严彩霞1，2. 遮阴对堇叶紫金牛光合特性和叶绿素荧光参数的影响[J]. 应用生态学报.

ZHANG Yun1,2,3, XIA Guo-hua2,3, MA Kai4, LI Gen-you2, DAI Ying-chao2， YAN Cai-xia1,2. Effects of shade on photosynthetic characteristics and chlorophyll fluorescence of Ardisia violacea.[J]. Chinese Journal of Applied Ecology.