Plant species composition data for Saddle grid, 1989 - ongoing.

Permanent 1 m^2 vegetation plots were established near each of the 88 Saddle grid stakes in 1989 by Marilyn Walker, who led the sampling effort until 1997. To estimate plant canopy cover, point quadrat measurements have been made at irregular intervals from 1989 to the present (1989, 1990, 1995, 1997, 2006, 2008 and yearly from 2010 onward). The point-quadrat technique used for sampling was described in Spasojevic et al. (2013) and Auerbach (1992). Auerbach, N. 1992. Effects of road and dust disturbance in minerotrophic and acidic tundra ecosystems, northern Alaska. University of Colorado, Boulder, Colorado, USA. Spasojevic, Marko J, William D Bowman, Hope C Humphries, Timothy R Seastedt, and Katharine N Suding. Changes in alpine vegetation over 21 years: Are patterns across a heterogeneous landscape consistent with predictions?” Ecosphere 4, no. 9 (2013): 1–18. https://doi.org/10.1890/es13-00133.1.1989年，玛丽莲·沃克（Marilyn Walker）在88根萨德尔网格桩（Saddle grid stakes）附近各设立了1平方米的永久性植被样地，其主导该采样工作直至1997年。 为估算植物冠层盖度，研究团队于1989年至今以非固定间隔开展了样点样方（point quadrat）测量，具体测量年份包括1989、1990、1995、1997、2006、2008年，且自2010年起改为年度观测。 本次采样所用的样点样方技术已在Spasojevic等人（2013）与Auerbach（1992）的研究中详细阐述。 奥尔巴赫（Auerbach, N.），1992年。《阿拉斯加北部矿养型与酸性苔原生态系统中的道路与粉尘干扰效应》，美国科罗拉多州博尔德市科罗拉多大学。 Spasojevic, Marko J.、William D. Bowman、Hope C. Humphries、Timothy R. Seastedt与Katharine N. Suding，2013年。《21年间高山植被的变化：异质景观中的格局是否与预测相符？》，《生态圈》（Ecosphere）第4卷第9期，第1–18页。https://doi.org/10.1890/es13-00133.1。