红树林人工幼林叶功能性状尺度变异及关联

Scale Variation and Correlation in Leaf Functional Traits of Young Mangrove Plantation

红树林是重要的海岸带蓝碳生态系统,揭示红树林人工幼林叶功能性状变异来源及关联,有助于理解红树林幼苗个体对环境的适应机制及其群落组成规律。在广西北海市西场镇安乐村的红树林人工幼林修复区,采集了764株红树林植株的9 932片叶片,测量每片叶片的叶厚度、叶面积、叶体积、比叶面积、叶干物质含量和叶组织密度,并运用广义线性模型、“varcomp”函数、主成分分析和Pearson相关分析等方法,分析叶功能性状在叶片、个体和物种尺度上的变异来源及关联。结果表明,6种叶功能性状值的变异系数均以叶片尺度最大、物种尺度最小,所有叶片功能性状的变异主要来源于物种尺度;主成分分析表明,在叶片、个体和物种尺度上,前2个主成分轴分别解释了6个功能性状变异总方差的75.6%、72.8%和96.8%;在3个尺度上,叶厚度、叶面积和叶体积两两之间均显著正相关,而比叶面积、叶干物质含量和叶组织密度与其他性状均负相关。

Mangrove ecosystem is an important coastal blue carbon ecosystem.To reveal the variation and di-mensional correlation of leaf functional traits of young mangrove plantation can help us understand the adapta-tion mechanism of young mangrove to changing environment and its community assembly rules.A total of 9932 leaves were collected from 764 plant individuals in the mangrove restoration area of Anle Village,Xichang Town,Beihai City,and leaf thickness,leaf area,leaf volume,specific leaf area,leaf dry matter con-tent,and leaf tissue density of each leaf were measured.The variation sources and correlations of leaf func-tional traits at leaf,individual,and species scales were explored using generalized linear models,varcomp function,principal component analysis,and pearson correlation analysis.The results showed that the coeffi-cient of variation of leaf functional traits was the largest at leaf scale and the smallest at species scale.The variation of all leaf functional traits mainly came from species scale.the first two principal component axes ex-plained 75.6%,72.8%and 96.8%of the total variance of the 6 functional traits,respectively.The results showed that the variation coefficient of the six leaf functional traits was highest at the leaf scale and lowest at the species scale.The variation of leaf thickness,leaf area,leaf volume,specific leaf area,leaf dry matter con-tent,and leaf tissue density mainly originated from species scale.Principal component analysis results showed at the leaf,individual and species scales,the first two principal component axes explained 75.6%,72.8%and 96.8%of the total variance of the six functional traits,respectively.At the three scales,there leaf thickness,leaf area,and leaf volume were significantly positive correlated,while specific leaf area,leaf dry matter con-tent,and leaf tissue density were mainly negatively correlated with other traits.