Leaf isoprene and monoterpene emission data-set across hyperdominant tree genera in the Amazon basin

This data package contains the analyzed data used to support the publication "Leaf isoprene and monoterpene emission distribution across hyperdominant tree genera in the Amazon basin," Phytochemistry, in-press. Data was collected from 162 trees across four sites in the Amazon. For all leaf samples studied for volatile isoprenoid emissions, branch cuttings were conducted in the upper canopy with sun exposed leaves with the assistance of a tree climber utilizing a pole pruner or directly accessed from flux towers. Large branches were removed from the upper canopy (up to 0.5-1.0 meter in length) and rapidly recut on the ground under water to maintain the transpiration stream. Net photosynthesis and isoprene and monoterpene emission rates were quantified from leaves during controlled changes in photosynthetically active radiation (PAR) using a commercial leaf photosynthesis system (LI-6400XT, LI-COR Inc., USA) interfaced with a gas chromatograph-mass spectrometer (GC-MS, 5975C series, Agilent Technologies, USA). For detailed methods and raw data, refer to the publication and related material cited in Dataset References.

本数据包包含用于支撑已被《植物化学（Phytochemistry）》录用待刊的论文《亚马孙盆地超优势树木属叶部异戊二烯与单萜排放分布特征》（Leaf isoprene and monoterpene emission distribution across hyperdominant tree genera in the Amazon basin）的分析数据。本次研究共采集亚马孙流域4个样地的162株树木样本。针对所有用于挥发性异戊二烯类排放检测的叶片样本，研究人员或由爬树人员借助高枝剪在上层冠层采集受阳光直射的枝条叶片，或直接从通量塔周边获取样本。采集的大枝条（长度可达0.5~1.0米）从上层冠层取下后，需在地面置于水中快速重新剪切切口，以维持植株的蒸腾流。借助商用叶片光合测定系统（LI-6400XT，美国LI-COR公司）连接气相色谱-质谱联用仪（GC-MS，5975C系列，美国安捷伦科技），在光合有效辐射（PAR）可控变化的条件下，定量测定叶片的净光合速率以及异戊二烯与单萜的排放速率。如需获取详细实验方法与原始数据，请参阅该论文及数据集参考文献中引用的相关材料。