典型阔叶红松林主要树种叶性状的垂直变异及经济策略
收稿日期: 2019-11-14
录用日期: 2020-04-30
网络出版日期: 2020-07-07
基金资助
国家自然科学基金(31870399)
Vertical variation and economic strategy of leaf trait of major tree species in a typical mixed broadleaved-Korean pine forest
Received date: 2019-11-14
Accepted date: 2020-04-30
Online published: 2020-07-07
Supported by
National Natural Science Foundation of China(31870399)
分析不同树种叶片性状的变化有助于了解植物群落结构。该文通过对典型阔叶红松(Pinus koraiensis)林15种阔叶树种的比叶质量、叶片厚度、叶干物质含量、叶绿素含量指数、叶片碳、氮、磷含量的测定, 分析了冠层高度对叶性状及叶性状间相关关系的影响。结果表明, 水曲柳(Fraxinus mandshurica)和大青杨(Populus ussuriensis)上层的比叶质量显著大于下层, 而其他树种冠层间的比叶质量无显著变化; 叶绿素含量指数在白桦(Betula platyphylla)和春榆(Ulmus japonica)冠层间的分布分别为上层显著大于下层和上层显著大于中层; 单位质量氮含量在水曲柳的中层显著大于上层。叶片性状间存在着广泛的相关性, 比叶质量与叶片厚度、干物质含量在三层间均呈显著正相关关系, 而有些性状, 只在一或二个冠层中存在一定的相关性。山杨(Populus davidiana)和大青杨的叶片倾向于选择光合能力较低、营养浓度较低、呼吸速率较慢的一端, 而黄檗(Phellodendron amurense)和山槐(Maackia amurensis)叶片更倾向于光合能力强、营养物质浓度高的一端。不同树种对光照响应的差异可能会改变不同冠层中叶片的形态和化学性状, 从而有助于群落构建和物种共存。
荀彦涵, 邸雪颖, 金光泽 . 典型阔叶红松林主要树种叶性状的垂直变异及经济策略[J]. 植物生态学报, 2020 , 44(7) : 730 -741 . DOI: 10.17521/cjpe.2019.0307
Aims An analysis of the variations in leaf traits of different tree species contributes to the understanding of plant community structures.
Methods This study explored the effect of the light environment on leaf traits at different canopy heights in a typical mixed broadleaved-Korean pine forest. We measured the leaf mass per area (LMA), leaf thickness (LT), leaf dry matter content (LDMC), chlorophyll content (CCI), leaf carbon content (C), mass-based and area-based nitrogen content (Nmass and Narea), and mass-based and area-based phosphorus content (Pmass and Parea) for 15 broad-leaved tree species in this forest.
Important findings We found that the LMA of Fraxinus mandschurica and Populus ussuriensis in the upper canopy were significantly higher than that in the lower canopy, but no significant vertical changes were detected in other species within the canopy. The CCI of Betula platyphylla increased from the lower to upper canopy. In contrast, the CCI of Ulmus japonica in the upper canopy was significantly higher than that in the middle canopy. The Nmass of Fraxinus mandschurica in the middle canopy was significantly higher than that in the upper canopy. These results indicated that the variations in leaf traits within the canopy were different among species. The LMA was positively correlated with the LT and LDMC in all three canopies, but the correlations of other trait combinations were only significant in one or two canopies. The results suggest that the leaves of Populus davidiana and Populus ussuriensis tend to adopt survival strategies involving lower photosynthetic ability, nutrient concentrations, and respiratory rates, while the leaves of Phellodendron amurense and Maackia amurensis tend to be located at the other end of the economics spectrum with contrasting trait values. Differences in species response to light may alter leaf morphological and chemical traits in canopy layers, and hence contribute to community assembly and species coexistence.
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