Plant growth and flowering in the Arctic System Science Program (ARCSS) grid at Utqiaġvik and Atqasuk, Alaska

Arctic ecosystems are changing in response to arctic warming, which is proceeding more than twice as fast as the global average. The International Tundra Experiment (ITEX) was established in the early 1990s to understand the effects of warming and environmental variability on tundra vegetation properties and ecosystem function. The ITEX program has been extremely valuable for detection of changes in tundra plant and ecosystem responses to experimental warming and to background climate change across sites that span the major ecosystems of the Arctic.
These files contain data representing the periodic plant measures of species within each plot in a comma delimited format. The data presented are seasonal growth of graminoids (length of leaf, and length of inflorescence) and seasonal flowering of all species (number of inflorescences in flower within a plot), collected weekly during the summers of 2012-2019 for a subset of 30 grid plots at two sites (Utqiaġvik, formerly Barrow, Arctic System Science Program (ARCSS) grid and Atqasuk ARCSS grid) and during the summer of 2021 for a subset of 30 grid plots at one site (Utqiaġvik ARCSS grid).

北极生态系统正响应北极变暖发生演变，而北极变暖的速率是全球平均水平的两倍有余。国际冻原实验计划（International Tundra Experiment, ITEX）于20世纪90年代初启动，旨在探究变暖与环境波动对冻原植被特征及生态系统功能的影响。ITEX项目在覆盖北极主要生态系统的各类样点中，对检测冻原植物及生态系统对实验增温与背景气候变化的响应变化具有极高的学术价值。
本数据集以逗号分隔格式存储各网格样地内物种的周期性植物观测数据。本次收录的数据包括：2012-2019年夏季，在两个样点（乌特恰维克，原名为巴罗的北极系统科学计划（Arctic System Science Program, ARCSS）网格与阿塔苏克ARCSS网格）的30个网格样地子集内，每周采集的禾草类植物季节生长指标（叶片长度、花序长度），以及所有物种的季节开花指标（样地内开花花序数）；2021年夏季，又在单个样点（乌特恰维克ARCSS网格）的30个网格样地子集内完成了同类数据的采集。