| 摘要: |
| 【目的】研究辽东栎群落中优势植物林内外光合参数的变化特点，以阐明植物的光能利用多样性在群落持续发育中的作用。【方法】在8月份生长旺盛期，采用LI 6400光合仪对延安公路山辽东栎林内16种成年优势植物进行光响应曲线测定，通过非线性拟合得到最大净光合速率（Pmax）、光饱和点（LSP）、光补偿点（LCP）和表观量子效率（AQY） 4个参数。对比分析16种植物在林内和林外孤立木状态不同光环境下的适应特征及平衡策略，对林内外16种植物的Pmax、AQY与植物耐荫性的相关关系进行多元回归分析，并采用聚类分析的方法，对林内16种优势植物进行光合适应类群划分。【结果】（1）不论在林内还是林外，16种植物的光能利用特性不同。同一种植物的上述4个参数值在林内外有不同程度的升高或降低，同一类群的不同植物在林内外的光能利用调节模式具有趋同性，有15种植物林外的4个参数较林内差异显著或极显著(P＜0.05)。（2）在林内，16种优势植物的LCP与Pmax呈正相关，与AQY呈负相关；在林外，16种优势植物的LCP与Pmax、AQY均呈微弱的负相关。（3）根据不同植物4个光合参数在林内外生境条件下的适应模式，对林内16种植物进行聚类分析，得到3个光合适应类群，每一类群均有其特殊的光合参数调节模式。【结论】辽东栎群落各优势植物的光合参数随生境的变化而变化，乔灌草植物变化差异不同，这是维持群落稳定的基础。 |
| 关键词: 辽东栎林 光合参数 耐荫性 光合适应类群 |
| DOI： |
| 分类号: |
| 基金项目:国家“十一五”科技支撑项目（2006BAD09B03）；中国科学院西部行动计划项目（KZCX2-XB2-05）；中国科学院百人计划项目（KZCX2-YW-BR-02） |
|
| Photosynthetic adaptation characteristics and adaptation patterns of dominant species in Quercus Liaotungensis forest in Gonglu mountain,Yan’an |
|
|
| Abstract: |
| 【Objective】Changing characteristics of dominant species’photosynthetic parameters in Quercus Liaotungensis community inside and outside forest were studied to elucidate the light utilization diversity of plants in the role of the sustainable development of the community.【Method】During vigorous growth period,August,the light curve of 16 dominant species in Quercus Liaotungensis forest in Yan’an Gonglu mountain was determined by LI-6400 portable photosynthesis system.The four parameters including maximal net photosynthetic rate (Pmax),light saturation point (LSP),light compensation point (LCP) and apparent quantum yield (AQY) were obtained after nonlinear fitting.The adaptive characteristics and balance strategies of 16 species under different light environments inside and outside the forest were analyzed comparatively.The correlation of shade tolerance with Pmax and AQY was discussed by multi factor analysis.The photosynthetic adaptation patterns of 16 dominant species inside forest were classified by hierarchical cluster analysis.【Result】(1)The light utilization characteristics of 16 species were different from each other whether inside or outside forest.The four parameters of the same species inside and outside the forest were increased or decreased with different degrees.Different species of the same group had regulation model convergence of light utilization inside and outside the forest.Compared with the four parameters of 16 dominant species inside the forest,15 species had significant differences or very significant differece outside the forest(P＜0.05).(2)A significantly positive correlation was found between LCP and Pmax,a negative correlation between LCP and AQY inside the forest,while a faint negative correlation was found between LCP and Pmax,LCP and AQY relativity outside the forest.(3) The strategies of the 16 species were divided into 3 types by hierarchical cluster analysis which identified significant patterns with 4 photosynthetic parameters and response inside and outside the forest.Each of these strategy types had a distinct photosynthetic parameter adjusting pattern.【Conclusion】Photosynthetic parameters of dominant species in Quercus Liaotungensis forest changed with different habitats,and the changing ranges were various,which was the foundation of community stability maintenance. |
| Key words: Quercus Liaotungensis forest photosynthetic parameter shade tolerance photosynthetic adaptation pattern |
