Dataset underlying the study "Floodplain forests are sensitive to salt-intrusion during summer droughts when dominated by Salix"

The dataset contains the measures recorded during the the study "Floodplain forests are sensitive to salt-intrusion during summer droughts when dominated by Salix". The objective of this study was to investigate how seasonal timing and intensity of salt intrusion affect the growth and recovery of juvenile <em>Salix alba</em> and <em>Alnus glutinosa</em> trees in temperate European floodplain conditions. This was a controlled mesocosm experiment conducted from April 2022 to May 2023, in which different sets of 2–3-year-old trees were exposed for one week to either freshwater (control) or two salt concentrations (5 or 20 PSU) during each season (spring, summer, autumn, winter). Data collection involved monthly measurements of morphological traits (tree height, diameter, leaf number and condition), environmental variables (soil and water salinity), and final biomass (fresh and dry weight of above- and belowground parts) after harvest.The data is divided in 3 csv files and the content is described in the README.txt file.Brief description of the three csv files:"seasonality_monthly.csv": measures taken monthly during the experiment."seasonality_watersalinity.csv": water salinity recorder monthly in the mesocosms."seasonality_biomass.csv": contains the biomass weights collected at the end of the experiment. The harvested biomass is stored at NIOZ. <br>

本数据集源自题为《河漫滩林在以柳属（Salix）为优势种的夏季干旱期对盐入侵敏感》的研究。本研究旨在探究盐入侵的季节节律与强度，对温带欧洲河漫滩生境中幼年白柳（Salix alba）与欧洲桤木（Alnus glutinosa）的生长与恢复能力产生的影响。
本实验为受控中宇宙（mesocosm）实验，于2022年4月至2023年5月间开展。实验中将2至3年生的苗木分为不同组别，于每个季节（春、夏、秋、冬）分别将其暴露于淡水（对照组）或两种盐浓度（5或20实用盐度单位（PSU））的环境中，暴露时长为一周。
数据采集工作涵盖每月测定的形态性状（树高、地径、叶片数量与健康状况）、环境变量（土壤与水体盐度），以及实验结束收获后测定的总生物量（地上与地下部分的鲜重与干重）。
本数据集分为3个逗号分隔值（CSV）文件，相关内容说明详见README.txt文件。三个CSV文件的简要说明如下：
1. "seasonality_monthly.csv"：实验期间每月采集的测定数据；
2. "seasonality_watersalinity.csv"：各中宇宙容器内每月记录的水体盐度数据；
3. "seasonality_biomass.csv"：包含实验结束时采集的生物量重量数据。收获的生物样本保存于NIOZ。