Individual plant phenology data for Saddle nodal plots, 1984 - 1992.

Phenological data were collected weekly for permanently tagged plants located in 14 permanent plots (refered to as the nodal plots) in the Niwot Ridge Saddle area. 12 of the plots represent the 6 plant communities or noda (two from each nodum) identified in the Saddle (May 1973). The two remaing plots were located adjacent to two temporary snowfences erected near Saddle grid stake 49. The plots were 1x10 m, and were further divided into 10, 1x1 m quadrats. Plant species studied include Acomastylis (Geum) rossii, Bistorta (Polygonum) bistortoides and Bistorta (Polygonum) vivipara. Ten individuals of each species present in a plot were randomly selected. Plants were tagged approximately two inches behind each plant with an aluminum tag labelled with the species abbreviation and plant number. Tagged plant locations were determined using a Cartesian coordinate system with the outside corner of quadrat 1 serving as the origin. These locations are on permanent file at INSTAAR. Data collection began on 1 June, or as plots became snow free, and continued until senescence. Missing tags were replaced during the first week of data collection. Missing plants were replaced by a new plant in immediate area and the new coordinates were recorded.

本研究于尼沃特岭鞍部区域（Niwot Ridge Saddle area）的14个永久样地（permanent plots，以下简称节点样地，nodal plots）内，对已完成永久标记的植株开展每周一次的物候数据（phenological data）采集工作。其中12个样地对应1973年5月在该鞍部区域划定的6个植物群落（plant communities）或节点单元（nodum，复数形式为noda），每个群落设置2个样地。剩余2个样地紧邻鞍部网格桩49附近设置的2座临时防雪围栏（temporary snowfences）。所有样地规格均为1×10米，进一步被划分为10个1×1米的样方（quadrats）。本次研究涉及的目标植物物种包括：钩萼水杨梅（Acomastylis (Geum) rossii）、北美拳参（Bistorta (Polygonum) bistortoides）以及珠芽拳参（Bistorta (Polygonum) vivipara）。每个样地内的各目标物种均随机选取10株个体。研究人员在每株植株后方约2英寸处悬挂铝制标记牌（aluminum tag），标记牌上标注有物种缩写与植株编号。标记植株的空间位置采用笛卡尔坐标系（Cartesian coordinate system）进行记录，以1号样方的外侧拐角作为坐标原点。上述坐标信息永久存档于INSTAAR机构。数据采集工作始于6月1日，或在样地积雪完全消融后即刻启动，直至植株衰老（senescence）阶段结束。在数据采集的首周内，若标记牌丢失则予以更换；若原标记植株缺失，则在其邻近区域选取替代植株，并记录该替代植株的新坐标。