Isoprene emission characteristics of tall and dwarf bamboos
Isoprene emission characteristics of tall and dwarf bamboos
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DOI：
10.1016/j.aeaoa.2021.100136
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发表时间：
2021-10
影响因子：
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通讯作者：
Ting‐wei Chang;Y. Kosugi;M. Okumura;Linjie Jiao;Siyu Chen;Ding-kang Xu;Zhi-ning Liu;S. Shibata;Ken-Hui Chang
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作者：
Ting‐wei Chang;Y. Kosugi;M. Okumura;Linjie Jiao;Siyu Chen;Ding-kang Xu;Zhi-ning Liu;S. Shibata;Ken-Hui Chang
据报告，几种竹子的异戊二烯排放量相当大。然而，竹子在分类学上高度多样，并且在物种之间具有不同的生态位或栖息地，并且目前的调查可能不足以得出竹子具有代表性的异戊二烯排放特征。本研究对不同生长类型（高、矮）和产地气候（温带、暖温带和亚热带）的5属18种竹类的异戊二烯通量、单位面积叶质量（LMA）、光合速率和电子传递速率（ETR）进行了观测。结果，我们观察到矮竹表现出非常低或没有排放;相比之下，高竹主要在2019年8月和9月温度高于30 °C时表现出相当大的异戊二烯排放通量。对于高大的竹子，异戊二烯排放通量，光合速率，ETR在面积为基础的单位与LMA相关。为了排除异戊二烯排放通量、光合速率和ETR之间的系统相关性，还对基于质量的单位观测值之间的相关性进行了检验，结果显示显著的正相关。高、矮秆竹间异戊二烯排放特性的差异与叶片平均光合速率、光合速率和ETR无关，因为它们之间没有差异。这表明异戊二烯排放的差异是由遗传差异引起的。来自矮竹种的异戊二烯的低排放是合理的，因为矮竹通常生长在具有相对低的热应力和低光照的区域，其中由于碳损失，异戊二烯的产生可能是无效的。本研究建议将这两种竹类划分为不同的异戊二烯排放功能类型。
Considerable isoprene emissions from several bamboo species have been reported. However, bamboos are highly diverse in taxonomy and have different niches or habitats among species, and the present investigation might be insufficient to conclude a representative isoprene emission trait for bamboos. In this study, isoprene flux, leaf mass per area (LMA), photosynthetic rate, and electron transport rate (ETR) observations were conducted for 18 species within five genera of bamboo species, which include different growth types (tall and dwarf) and climates of the region of origin (temperate, warm-temperate, and subtropical). As a result, we observed that dwarf bamboos exhibited very low or no emission; in contrast, tall bamboos demonstrated considerable isoprene emission fluxes mainly in August and September 2019 at temperatures greater than 30 °C. For tall bamboos, isoprene emission fluxes, photosynthetic rate, and ETR in area-based units were correlated with LMA. To exclude the systematic correlation among isoprene emission flux, photosynthetic rate, and ETR, correlations among the observations of mass-based units were also tested, and the results demonstrated significant positive correlations. The distinction in isoprene emission traits between tall and dwarf bamboos was independent of LMA, photosynthetic rate, and ETR, as there was no difference between them. This implies that the distinction in isoprene emission was caused by genetic differences. The low emission of isoprene from the dwarf species is reasonable because dwarf bamboos usually grow in areas with relatively low heat stress and low light where the production of isoprene could be futile due to carbon loss. This study suggests separating the two bamboo types into different functional types of isoprene emissions.