Coordination between leaf and stem traits related to leaf carbon gain and hydraulics across 32 drought-tolerant angiosperms
Coordination between leaf and stem traits related to leaf carbon gain and hydraulics across 32 drought-tolerant angiosperms
复制标题
DOI：
10.1007/s00442-008-0965-6
复制
发表时间：
2008-05-01
期刊：
影响因子：
2.7
通讯作者：
Yamashita, Naoko
中科院分区：
文献类型：
--
作者：
Ishida, Atsushi;Nakano, Takashi;Yamashita, Naoko
我们检查了小博宁群岛浅土山脊处 32 种共存被子植物的叶和茎中与叶 C 经济和水分利用相关的 15 个性状。在不同物种中，茎密度与单位面积叶质量 (LMA)、叶寿命 (LLS) 以及单位叶总酚和缩合单宁 N（基于 N）呈正相关，与叶渗透势和叶饱和水含量呈负相关。 LMA 和 LLS 与光合参数呈负相关，例如面积、质量和基于氮的同化率。虽然茎密度和叶片渗透势与光合参数无关，但它们与叶片碳经济的一些参数相关，例如LMA和LLS。在主成分 (PCA) 分析中，前三个轴占总变异的 74.4%。轴 1 解释了总变异的 41.8%，与叶片 C 和 N 经济参数密切相关。同样，轴 2 解释了总变化的 22.3%，它与用水参数相关。轴 3 解释了总变异的 10.3%，与叶子内的化学防御有关。轴 1 和轴 2 较好地分离了功能类型，即匍匐乔木、粗树、其他木本植物、C-3 灌木和草本植物、棕榈树和 CAM 植物，表明植物功能类型具有与叶片碳氮经济和水分利用相关的相似属性。此外，当图扩展为两个不相关的性状（基于叶质量的同化率和茎密度）时，它也分离了这些功能类型。这些数据表明，具有对比植物策略的功能类型的差异可归因于叶碳经济、水力学和叶寿命之间的功能整合，并且基于叶质量的同化率和茎密度是反映植物物种不同功能的关键因素。
We examined 15 traits in leaves and stems related to leaf C economy and water use for 32 co-existing angiosperms at ridge sites with shallow soil in the Bonin Islands. Across species, stem density was positively correlated to leaf mass per area (LMA), leaf lifespan (LLS), and total phenolics and condensed tannins per unit leaf N (N-based), and negatively correlated to leaf osmotic potential and saturated water content in leaves. LMA and LLS were negatively correlated to photosynthetic parameters, such as area-, mass-, and N-based assimilation rates. Although stem density and leaf osmotic potential were not associated with photosynthetic parameters, they were associated with some parameters of the leaf C economy, such as LMA and LLS. In the principal component (PCA) analysis, the first three axes accounted for 74.4% of total variation. Axis 1, which explained 41.8% of the total variation, was well associated with parameters for leaf C and N economy. Similarly, axis 2, which explained 22.3% of the total variation, was associated with parameters for water use. Axis 3, which explained 10.3% of the total variation, was associated with chemical defense within leaves. Axes 1 and 2 separated functional types relatively well, i.e., creeping trees, ruderal trees, other woody plants, C-3 shrubs and forbs, palms, and CAM plants, indicating that plant functional types were characterized by similar attributes of traits related to leaf C and N economy and water use. In addition, when the plot was extended by two unrelated traits, leaf mass-based assimilation rates and stem density, it also separated these functional types. These data indicate that differences in the functional types with contrasting plant strategies can be attributed to functional integration among leaf C economy, hydraulics, and leaf longevity, and that both leaf mass-based assimilation rates and stem density are key factors reflecting the different functions of plant species.