Swedish Forest Phenology dataset

As part of the SLU environmental monitoring and assessment program, the Experimental Forests of the university collect detailed phenological measurements and observations on the tree species downy birch (betula pubescens), silver birch (betula pendula), Norway spruce (picea abies) and Scots pine (pinus sylvestris), and on two berry shrubs common in the Swedish forest, bilberry (vaccinium myrtillus) and lingonberry (vaccinium vitis-idaea). The dataset includes detailed data on leaf and shoot development on the tree species, and on flowering, emergence of unripe and ripe berries on the berry species during the years 2006-2020. The dataset shows the averaged values of measurements and observations performed on several individuals during the same assessment day. The dataset includes temperature sums, calculated from climate monitoring data performed at each observation site. The dataset also includes R-scripts that read and handle the observation data tables by interpolation between assessment days and between temperature sum levels at assessments, to get estimated daily values and values for even steps of temperature sums, respectively. By this, daily averages and SE and temperature sum step averages and SE for all years can be calculated and plotted by the scripts. Also, standard phenological phase shifts are observed on the birches (from bud burst to shedding of leaves), and on spruce and pine (only bud burst and shoot elongation).作为SLU环境监测与评估计划的一部分，该大学实验林场针对多种林木与瑞典森林常见浆果灌丛开展了详细的物候观测与测量工作，涉及物种包括毛桦（Betula pubescens）、垂枝桦（Betula pendula）、挪威云杉（Picea abies）、欧洲赤松（Pinus sylvestris）四种林木，以及黑果越橘（Vaccinium myrtillus）与红豆越橘（Vaccinium vitis-idaea）两种浆果灌丛。本数据集涵盖2006年至2020年间，上述林木的叶片与枝条发育数据，以及浆果灌丛的开花、未成熟浆果与成熟浆果出现情况的详细记录。数据集展示了同一观测日下，多个个体的测量与观测结果的平均值。数据集包含由各观测点气候监测数据计算得到的积温值。本数据集同时附带用于处理观测数据表的R脚本：通过在观测日之间以及各次评估的积温区间内进行插值，分别估算逐日数据与积温等间隔步长下的对应数值。借助该脚本，可计算并绘制所有年份的日平均值、标准误（Standard Error，SE）以及积温步长平均值与标准误。此外，数据集还记录了桦树（从芽萌动至落叶）、云杉与松树（仅芽萌动和枝条伸长）的标准物候期变化情况。