Differences and trade-off strategies of leaf functional traits between old and young forests of the mangrove Aegiceras corniculatum
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摘要: 桐花树（Aegiceras corniculatum）是我国常见的红树林先锋物种，在河口高等植物群落构成、海岸防风消浪方面具有重要作用。为了了解桐花树不同发育阶段叶功能性状的变异规律，本研究以桐花树为研究对象，分析了叶功能性状在老林与幼林之间的差异及权衡关系。结果表明：（1）叶面积、叶氮含量、叶厚度、叶绿素含量和叶干物质含量均表现为老林显著低于幼林，而比叶面积则表现为老林显著大于幼林。（2）老林与幼林的比叶面积与叶绿素含量、叶氮含量、叶干物质含量和叶厚度均呈显著负相关，且老林中相关性强度大于幼林；而老林与幼林的叶绿素含量、叶氮含量和叶厚度两两性状之间均呈显著正相关，且幼林中相关性强度大于老林。（3）主成分分析结果表明，比叶面积是影响桐花树老林的关键性状，叶绿素含量和叶氮含量是影响桐花树幼林的关键性状。（4）在叶功能性状的权衡关系中，幼林叶功能性状之间的权衡关系普遍大于老林。Abstract: Aegiceras corniculatum is a common pioneer species in China’s mangroves. It plays an important role in the composition of estuarine higher plant communities and in preventing wind and waves along the coast in southern China. To gain a deeper understanding of the variation patterns of leaf functional traits in different developmental stages (old and young forests) of A. corniculatum, this study used A. corniculatum as the research object and analyzed the differences and trade-offs of leaf functional traits between old and young forests. The results show that: (1)leaf area (LA), leaf nitrogen content (LN), leaf thickness (LT), chlorophyll content (Chl) and leaf dry matter content (LDMC) of the old forest were significantly lower than that of the young forest, while the specific leaf area (SLA) shows that the old forest was significantly larger than that of the young forest; (2)the SLA of old and young forests of A. corniculatum was significantly negatively correlated with Chl, LN, LDMC and LT, but the negative correlation was stronger in the old forests and weaker in young forests. There was a significant positive correlation between the Chl, LN and LT in the old forests and the young forests, but the correlation ship was stronger in the young forests and weaker in the old forests; (3)the results of principal component analysis showed that SLA was the key trait affecting the stability of the old forests, while Chl and LN were the key traits affecting the growth and development of the young forests; (4)the trade-offs relationship between leaf functional traits in young forests is generally greater than that in the old forests.
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Key words:
- mangrove /
- Aegiceras corniculatum /
- old forests /
- young forests /
- leaf functional traits /
- trade-offs
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图 2 老林与幼林叶功能性状的比较
LA: 叶面积 leaf area; LN: 叶氮含量 leaf nitrogen content; LT: 叶厚度 leaf thickness; Chl: 叶绿素含量chlorophyll content; LDMC: 叶干物质含量 leaf dry matter content; SLA: 比叶面积 specific leaf area。OF: 老林 old forest; YF: 幼林 young forest
Fig. 2 Comparison of leaf functional traits between old and young forests
图 3 不同方位老林与幼林叶功能性状比较
LA: 叶面积 leaf area; LN: 叶氮含量 leaf nitrogen; LT: 叶厚度 leaf thickness; Chl: 叶绿素含量chlorophyll content; LDMC: 叶干物质含量 leaf dry matter content; SLA: 比叶面积 specific leaf area。E: 东 east; S: 南 south; W: 西 west; N: 北 north
Fig. 3 Comparison of leaf functional traits between old and young forests at different locations
图 4 老林与幼林叶功能性状关联
LA: 叶面积 leaf area; LN: 叶氮含量 leaf nitrogen content; LT: 叶厚度 leaf thickness; Chl: 叶绿素含量chlorophyll content; LDMC: 叶干物质含量 leaf dry matter content; SLA: 比叶面积 specific leaf area。a: 老林; b: 幼林。*: p＜0.05; **: p＜0.01;***: p＜0.001
Fig. 4 Correlation between leaf functional traits in old and young forests
图 5 老林与幼林叶功能性状的主成分分析
LA: 叶面积 leaf area; LN: 叶氮含量 leaf nitrogen content; LT: 叶厚度 leaf thickness; Chl: 叶绿素含量chlorophyll content; LDMC: 叶干物质含量 leaf dry matter content; SLA: 比叶面积 specific leaf area
Fig. 5 Principal component analysis(PCA) of leaf functional traits in old and young forests
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