不同楸树无性系光合特征的比较研究

采用Li-6400光合系统对无性系1-3、1-4、004-1、015-1和7 080等5个优良楸树无性系苗期的光合特征进行了研究,结果表明：（1）5个楸树无性系的光响应曲线变化趋势大致相同,各无性系Pmax大小顺序为1-3〉7080〉015-1〉004-1〉1-4,无性系1-3和7080对光环境适应能力强,其LSP分别为1 147.97、1 196.31μmol/m2.s,而无性系1-4对光照的适应范围相对最窄;（2）各无性系单位面积净光合日总量存在差异,其中无性系1-4单位面积净光合量最大、为433 974.24μmol/m2,其次为无性系1-3,其值为401 290.20μmol/m2;（...

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Published in广东农业科学 Vol. 40; no. 16; pp. 57 - 60
Main Author 朱雯 张祥宇 李吉跃 王军辉 董蕾 陈俊轩 何茜 章智钊 饶桂香
Format Journal Article
LanguageChinese
Published 华南农业大学林学院,广东广州,510642%中国林业科学研究院林业研究所,北京,100091 2013
Subjects
光合特征
无性系
楸树
楸树
无性系
光合特征
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ISSN1004-874X

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Summary:采用Li-6400光合系统对无性系1-3、1-4、004-1、015-1和7 080等5个优良楸树无性系苗期的光合特征进行了研究,结果表明：（1）5个楸树无性系的光响应曲线变化趋势大致相同,各无性系Pmax大小顺序为1-3〉7080〉015-1〉004-1〉1-4,无性系1-3和7080对光环境适应能力强,其LSP分别为1 147.97、1 196.31μmol/m2.s,而无性系1-4对光照的适应范围相对最窄;（2）各无性系单位面积净光合日总量存在差异,其中无性系1-4单位面积净光合量最大、为433 974.24μmol/m2,其次为无性系1-3,其值为401 290.20μmol/m2;（3）5个无性系的Tr与Cond呈现相同的变化趋势,无性系1-3、1-4和015-1的Pn日变化呈现双峰曲线,表现出明显的＂光合午休＂现象,而无性系004-1和7080未出现;（4）综合考虑多种光合特征指标,无性系1-3光合作用能力相对最优。
Bibliography:44-1267/S
Measurements of photosynthetic characteristics of 5 Catalpa bungei clones（1-3,1-4,004-1,015-1 and 7080） by Li6400 portable photosynthesis system were indicated that,（1） Light response curves of 5 clones were roughly the same,the maximum net photosynthetic rate（Pmax） was ranked as follows： 1-3 7080 015-1 004-1 1-4.Clone 1-3 and clone 7080 had strong light environmental adaptability,the light saturation point（LSP） of them were 1 147.97 μmol/m2.s and 1 196.31 μmol/m2.s respectively,and clone 1-4 had narrowest range of adaptation to light.（2） Total photosynthetic amount per area of 5 clones were quite different,clone 14 was the best（433 974.24 μmol/m2）,and clone 1-3 was the second（401 290.20 μmol/m2）.（3）Five clones’ trends of tanspiration rate（Tr） were the same as stomatal conductance（Cond）,the diurnal variation curves of net photosynthetic rate（Pn） of clone 1-3,1-4 and 015-1 showed two typical peaks with obvious midday depression,but clone 004-1 and 7080 didn ’t.（4） Considering a variety of photosynthet
ISSN:1004-874X