John Grace P, Scoffoni Christine, Buckley Thomas N, Villar Rafael, Poorter Hendrik, Sack Lawren
Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA, 90095, USA.
Plant Breeding Institute, Sydney Institute of Agriculture, The University of Sydney, 12656, Newell Hwy, Narrabri, NSW, 2390, Australia.
Ecol Lett. 2017 Apr;20(4):412-425. doi: 10.1111/ele.12739. Epub 2017 Feb 14.
Leaf dry mass per unit leaf area (LMA) is a central trait in ecology, but its anatomical and compositional basis has been unclear. An explicit mathematical and physical framework for quantifying the cell and tissue determinants of LMA will enable tests of their influence on species, communities and ecosystems. We present an approach to explaining LMA from the numbers, dimensions and mass densities of leaf cells and tissues, which provided unprecedented explanatory power for 11 broadleaved woody angiosperm species diverse in LMA (33-262 g m ; R = 0.94; P < 0.001). Across these diverse species, and in a larger comparison of evergreen vs. deciduous angiosperms, high LMA resulted principally from larger cell sizes, greater major vein allocation, greater numbers of mesophyll cell layers and higher cell mass densities. This explicit approach enables relating leaf anatomy and composition to a wide range of processes in physiological, evolutionary, community and macroecology.
单位叶面积的叶干质量（LMA）是生态学中的一个核心性状，但其解剖学和组成基础尚不清楚。一个用于量化LMA的细胞和组织决定因素的明确数学和物理框架，将能够检验它们对物种、群落和生态系统的影响。我们提出了一种从叶细胞和组织的数量、尺寸和质量密度来解释LMA的方法，该方法为11种LMA各异的阔叶木质被子植物物种（33 - 262 g/m²；R² = 0.94；P < 0.001）提供了前所未有的解释力。在这些不同的物种中，以及在对常绿与落叶被子植物的更大规模比较中，高LMA主要源于细胞尺寸更大、主脉分配更多、叶肉细胞层数更多以及细胞质量密度更高。这种明确的方法能够将叶片解剖结构和组成与生理、进化、群落和宏观生态学中的广泛过程联系起来。
