Data related to the physiology, growth, and survival of balsam fir and northern white-cedar seedlings exposed to experimental droughts and floods

This publication contains data collected in a greenhouse experiment of drought and flood effects on northern white-cedar and balsam fir seedlings. To determine lethal drought and flood thresholds for each species, treatments were initiated in July 2021 using 205 3- to 4-year-old cedar and fir seedlings planted in containers in May 2021. Drought treatments were initiated by stopping irrigation and flood treatments were initiated by placing seedling containers in water. Cedar and fir seedlings were randomly assigned to one of 8 drought or flood treatment lengths (8 to 66 days or 8 to 53 days, respectively), or one of two replicates of controls. Measurements were made at start and end of the treatment season (2021) and recovery season (2022) and at each end of treatment (2021). Data are available in 7 datasets: 1) volumetric water content and midday water potential (vwc_wp.csv); 2) percent brown foliage (PBF_mortality); 3) seedling height and diameter (ht_diam.csv); 4) minimum epidermal conductance (gmin.csv); 5) evapotranspiration (evapotrans.csv); 6) paired average minimum midday water potential and final percent brown foliage (pbf_wp.csv); 7) paired xylem relative water content and midday water potential (rwc.csv).Data were collected to determine how seedlings of fir and cedar were able to avoid, resist and recover from experimental drought and flood treatments of different lengths (8 to 66 days).For more information about this study and these data, see Schulz et al. (2024).

本出版物收录了在温室实验中收集的数据，该实验旨在探究干旱和洪水对北方白冷杉和云杉幼苗的影响。为了确定每种物种的致死干旱和洪水阈值，于2021年7月启动了处理，使用了205株3至4岁的冷杉和云杉幼苗，这些幼苗于2021年5月种植于容器中。干旱处理通过停止灌溉启动，而洪水处理则是通过将幼苗容器置于水中启动。冷杉和云杉幼苗被随机分配到8种干旱或洪水处理时长中之一（分别为8至66天或8至53天），或两个对照组的其中之一。测量在处理季节（2021年）开始和结束时，以及恢复季节（2022年）的每个处理结束时刻进行。数据分布在7个数据集中：1）体积水含量和中午水分势（vwc_wp.csv）；2）褐色叶面积百分比（PBF_mortality）；3）幼苗高度和直径（ht_diam.csv）；4）最小表皮传导率（gmin.csv）；5）蒸散量（evapotrans.csv）；6）配对平均最小中午水分势和最终褐色叶面积百分比（pbf_wp.csv）；7）配对木质部相对水含量和中午水分势（rwc.csv）。收集数据旨在确定云杉和冷杉幼苗如何避免、抵抗和从不同长度（8至66天）的实验干旱和洪水处理中恢复。关于本研究和这些数据的更多信息，请参阅Schulz等（2024）。