It is challenging to estimate isoprene emissions from plants and determine the basal isoprene emission rate (i.e., isoprene emission capacity under a specific light and leaf temperature) of plant species. Previous studies have investigated the effect of physiological factors on isoprene emission capacity; however, the effect of leaf morphology on isoprene emission capacity has seldom been mentioned. This study aims to clarify the relationship between the basal isoprene emission rate and leaf mass per area (LMA) of a woody bamboo (Phyllostachys pubescens). Since there was no observation of isoprene emission from low-LMA leaves of P. pubescens, we conducted measurements on culms exhibiting lower LMA (27.5-47.9 g m^-2). By observing leaf-scale isoprene emission flux under a specific incident light (1000 μmol m^-2 s^-1) and temperature (30 °C) to represent basal isoprene emission fluxes, we found a series of varied area-based isoprene emission rate among leaves (1.4-32.2 nmol m^-2 s^-1) and a strong correlation between area-based isoprene emission rate and LMA without any distinction between culms. A further comparison with other studies demonstrated that even for the culms that exhibited larger LMA and isoprene emission flux, a generally consistent pattern in the relation of area-isoprene emission flux and LMA could be found across these sites. This result suggests the importance of detecting LMA in the determination of the basal isoprene emission rate, which can improve the current emission estimation method.

中文翻译：

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异戊二烯排放通量对毛竹（毛竹）单位面积叶质量的依赖性

估算植物的异戊二烯排放并确定植物物种的基础异戊二烯排放率（即特定光和叶温下的异戊二烯排放能力）具有挑战性。以前的研究已经调查了生理因素对异戊二烯排放能力的影响；然而，很少提及叶片形态对异戊二烯释放能力的影响。本研究旨在阐明木本竹 ( Phyllostachys pubescens )的基础异戊二烯排放率与单位面积叶质量 (LMA) 之间的关系。由于没有观察到从P. pubescens 的低 LMA 叶子中释放出异戊二烯，我们对表现出较低 LMA (27.5-47.9 gm ^{-2) 的}秆进行了测量）。通过观察特定入射光（1000 μmol m ^-2 s ^-1）和温度（30°C）下的叶尺度异戊二烯发射通量来表示基础异戊二烯发射通量，我们发现了一系列不同的基于面积的异戊二烯发射率叶 (1.4-32.2 nmol m ^-2 s ^-1) 以及基于面积的异戊二烯排放率与 LMA 之间的强相关性，而茎秆之间没有任何区别。与其他研究的进一步比较表明，即使对于表现出较大 LMA 和异戊二烯排放通量的秆，在这些地点也可以发现面积-异戊二烯排放通量和 LMA 关系的基本一致模式。该结果表明检测LMA在确定基础异戊二烯排放率中的重要性，这可以改进当前的排放估计方法。