Photosynthetic and stomatal response, and leaf traits, of two pine species, Talladega National Forest, Alabama, 2023

Photosynthetic response to irradiance (AQ), CO2 (ACi) and stomatal response to irradiance measurements on two pine species common to the southeast United States, long leaf pine, Pinus palustris Mill., and loblolly pine, Pinus taeda L.. Data were collected in June 2023 within the Oakmulgee District of the Talladega National Forest in west-central Alabama at the NEON site (TALL). Measurements were made with four LI-COR LI-6800 and one LI-COR LI-6400XT gas exchange systems. ACi and AQ curves enable the estimation of photosynthetic parameters (e.g., Vcmax, Jmax, Rd, aQY), while stomatal response curves enable the estimation of stomatal slope and intercept parameters. Foliar trait data (needle dimensions, leaf mass per area, leaf nitrogen concentration) is provided for all gas exchange samples. The data package files include multiple raw and processed data files (csv), metadata files (csv), the complete instrument output for all measurements in .zip format, and a pdf describing the experimental protocol.

本数据集涵盖美国东南部常见的两种松树——长叶松（*Pinus palustris* Mill.）与火炬松（*Pinus taeda* L.）的光强响应（AQ）、CO₂响应（ACi）光合特性，以及气孔对光强响应的测量数据。数据采集于2023年6月，地点位于美国阿拉巴马州中西部塔拉迪加国家森林奥克马尔吉分区的NEON站点（TALL）。测量工作使用4台LI-COR LI-6800与1台LI-COR LI-6400XT气体交换系统完成。通过ACi与AQ曲线可估算光合参数（如Vcmax、Jmax、Rd、aQY），气孔响应曲线则可用于推导气孔导度响应的斜率与截距参数。所有气体交换样品均配套提供叶片性状数据，包括针叶尺寸、单位面积叶质量、叶氮浓度。本数据包包含多份原始与处理后的CSV格式数据文件、元数据CSV文件、收录全部测量仪器原始输出的ZIP压缩包，以及一份详细阐述实验方案的PDF文档。