Leaf bilateral asymmetry, an important indicator of leaves that tend to be affected by the above-ground architectural structure of plants and their environments (especially light), has been poorly studied. Taylor’s power law (TPL) describes a power-law relationship between the mean and variance of a non-negative random variable, and its exponent has been demonstrated to reflect the degree of heterogeneity of the branch spatial arrangement of plants. In this study, we checked whether the mean-variance relationship of the absolute difference in area between the left and right sides of 11396 leaves from 35 species of plants within four families followed TPL. TPL was found to hold true for each species investigated here, and the estimated TPL exponents fell within a range of 1.5 to 2.0. At the family level, there were no any significant differences in the estimated exponents of TPL among the pooled data of Lauraceae, Oleaceae, and Bambusoideae, but those exponent values were significantly smaller than that of Magnoliaceae. We also pooled the data from the four families, and we found that there was a general rule for the mean-variance relationship for the bilateral asymmetry among the studied broad-leaved plants. Given the variety of leaf bilateral asymmetry among species, our results highlight the importance of plant aboveground architecture and the heterogeneity of leaves on different positions to a better understanding of leaf development mechanism and how it responds to the surrounding environment.

叶片双侧不对称性是叶片的重要指标，叶片的不对称性很容易受到植物的地上建筑结构及其环境（尤其是光）的影响，但对其的研究很少。泰勒幂律（TPL）描述了非负随机变量的均值和方差之间的幂律关系，其指数已被证明可以反映植物分支空间排列的异质程度。在这项研究中，我们检查了来自4个科的35种植物的11396片叶子的左侧和右侧的面积绝对差的均值-方差关系是否遵循TPL。发现此处研究的每个物种均适用TPL，估计的TPL指数在1.5至2.0的范围内。在家庭层面上 在月桂科，油木科和竹科植物的汇总数据中，TPL的估计指数没有显着差异，但这些指数值显着小于木兰科。我们还汇总了这四个科的数据，发现在研究的阔叶植物之间存在关于双边不对称性的均值-方差关系的一般规则。考虑到物种之间叶片双侧不对称性的多样性，我们的结果强调了植物地上建筑的重要性以及不同位置叶片的异质性对于更好地理解叶片发育机制及其对周围环境的响应的重要性。但是那些指数值明显比木兰科小。我们还汇总了这四个科的数据，发现在研究的阔叶植物之间存在关于双边不对称性的均值-方差关系的一般规则。考虑到物种之间叶片双侧不对称性的多样性，我们的结果强调了植物地上建筑的重要性以及不同位置叶片的异质性对于更好地理解叶片发育机制及其对周围环境的响应的重要性。但是那些指数值明显比木兰科小。我们还汇总了这四个科的数据，发现在研究的阔叶植物之间存在关于双边不对称性的均值-方差关系的一般规则。考虑到物种之间叶片双侧不对称性的多样性，我们的结果强调了植物地上建筑的重要性以及不同位置叶片的异质性对于更好地理解叶片发育机制及其对周围环境的响应的重要性。