%0 Journal Article
%T 遮阴条件下大叶竹节树光合特性和荧光参数的变化&lt;br&gt;Effects of Shading on the Photosynthetic Characteristics and Chlorophyll Fluorescence Parameters of &lt;i&gt;Carallia garciniaefolia&lt;/i&gt;
%A 黄菁
%A 魏丽萍
%A 孙小龙
%A 原慧芳
%A 田耀华&lt
%A br&gt
%A HUANG Jing
%A WEI Li-ping
%A SUN Xiao-long
%A YUAN Hui-fang
%A TIAN Yao-hua
%J 西南大学学报(自然科学版)
%D 2018
%R 10.13718/j.cnki.xdzk.2018.03.010
%X 为研究大叶竹节树对弱光的适应性，通过盆栽实验，分析了不同程度(0%，25%，50%，75%)遮阴条件下大叶竹节树幼苗光合特性和荧光参数的变化.结果表明，随着遮阴程度增加，叶片净光合速率(&lt;i&gt;P&lt;/i&gt;&lt;sub&gt;n&lt;/sub&gt;)、气孔导度(&lt;i&gt;G&lt;/i&gt;&lt;sub&gt;s&lt;/sub&gt;)、蒸腾速率(&lt;i&gt;T&lt;/i&gt;&lt;sub&gt;r&lt;/sub&gt;)、水分利用效率(WUE)和光合有效辐射(PAR)随之减小，而胞间CO&lt;sub&gt;2&lt;/sub&gt;浓度(&lt;i&gt;C&lt;/i&gt;&lt;sub&gt;i&lt;/sub&gt;)随之增大，说明非气孔制限因素是大叶竹节树光合速率下降的主要原因.各遮阴条件下叶片总叶绿素(a+b)、叶绿素a和叶绿素b质量比均显著高于全光照，且随遮阴程度的增加叶绿素质量比逐渐上升，而叶绿素a/b值则随着遮阴程度的增强而下降.叶绿素荧光参数PSⅡ原初光能转化效率(&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;v&lt;/sub&gt;/&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;m&lt;/sub&gt;)和潜在活性(&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;v&lt;/sub&gt;/&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;o&lt;/sub&gt;)的日变化呈单谷曲线；各遮阴条件下&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;v&lt;/sub&gt;/&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;m&lt;/sub&gt;和&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;v&lt;/sub&gt;/&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;o&lt;/sub&gt;值均高于全光照，且与遮阴程度正相关，说明大叶竹节树是一种耐荫性很强的植物.在遮阴条件下，光补偿点、光饱和点、净光合速率、暗呼吸速率和叶绿素a/b值降低，而叶绿素a和b质量比、光能利用率、&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;v&lt;/sub&gt;/&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;m&lt;/sub&gt;以及&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;v&lt;/sub&gt;/&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;o&lt;/sub&gt;值提高，从而增强弱光条件下的生长能力.&lt;br&gt;To study the adaptability of &lt;i&gt;Carallia garciniaefolia&lt;/i&gt; to low light conditions, the effects of different shading treatments (25%, 50% and 75% shading) on the photosynthetic characteristics and chlorophyll fluorescence of &lt;i&gt;C. garciniaefolia&lt;/i&gt; seedlings were studied in a pot experiment. The results showed that net photosynthetic rate (&lt;i&gt;P&lt;/i&gt;&lt;sub&gt;n&lt;/sub&gt;), stomatal conductivity (&lt;i&gt;G&lt;/i&gt;&lt;sub&gt;s&lt;/sub&gt;), transpiration rate (&lt;i&gt;T&lt;/i&gt;&lt;sub&gt;r&lt;/sub&gt;), water use efficiency (WUE) and photosynthetic active radiation (PAR) of the plant decreased, while its stomatal CO&lt;sub&gt;2&lt;/sub&gt; concentration (&lt;i&gt;C&lt;/i&gt;&lt;sub&gt;i&lt;/sub&gt;) increased significantly with increasing shading, suggesting that non-stomatal limitation is the main cause of the reduction in photosynthesis rate of &lt;i&gt;C. garciniaefolia&lt;/i&gt;. The contents of total chlorophyll (a+b), chlorophyll a and chlorophyll b in the leaves of the plants grown under different shading conditions were all significantly higher than under full day light, and increased with increasing shading, while chlorophyll a/b decreased. &lt;i&gt;F&lt;/i&gt;&lt;sub&gt;v&lt;/sub&gt;/&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;m&lt;/sub&gt; and &lt;i&gt;F&lt;/i&gt;&lt;sub&gt;v&lt;/sub&gt;/&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;o&lt;/sub&gt; in the shading treatments were
%K 大叶竹节树
%K 遮阴处理
%K 光合特性
%K 荧光参数&lt
%K br&gt
%K &lt
%K i&gt
%K Carallia garciniaefolia&lt
%K /i&gt
%K shading treatment
%K photosynthetic characteristic
%K fluorescence parameter
%U http://xbgjxt.swu.edu.cn/jsuns/html/jsuns/2018/3/201803010.htm