Foliage projective cover of 40 vegetation sites of central Chukotka from 2018

Field investigations were performed in four areas: a treeless mountainous tundra (16-KP-04; Lake Rauchuagytgyn area), tundra-taiga transition zone (16-KP-01, Lake Ilirney area) and a northern taiga (18-BIL-01, 18-BIL-02). In total, 40 sites were investigated. The sites were placed to cover different vegetation communities that characterise central Chukotka. Fifteen-metre radius sampling plots (sites) were demarcated in the most homogeneous locations. Heterogeneity was accommodated by roughly assorting vegetation into two to three vegetation types per sampling plot. Within each area of roughly estimated vegetation types we selected three representative 2 x 2 m subplots for representative ground-layer foliage projective cover assessment. Projective cover of tall shrubs and trees was estimated on 15-m radius circular plots directly. All data was collected by scientists from Alfred Wegener Institute (AWI), Helmholtz Centre for Polar and Marine Research and University of Potsdam, Germany, The Institute for Biological problems of the Cryolithozone, Russian Academy of Sciences, Siberian branch, and The Institute of Natural Sciences, North-Eastern Federal University of Yakutsk, Yakutsk, Russia.

本研究于4类区域开展野外调查：无树山地苔原（16-KP-04；劳丘阿吉特金湖（Lake Rauchuagytgyn）区域）、苔原-泰加林过渡带（16-KP-01、伊利尔尼湖（Lake Ilirney）区域）以及北部泰加林（18-BIL-01、18-BIL-02）。共调查样地40个，样地布设原则为覆盖楚科奇中部的典型植被群落类型。
在植被均质性最高的区域划定半径15米的采样样地。为兼顾植被异质性，每个采样样地内将植被大致划分为2至3种植被类型；在每类粗略划分的植被类型中，选取3个代表性2×2米小样方，用于开展地被层植被投影盖度（ground-layer foliage projective cover）的评估；而高大灌木与乔木的投影盖度则直接在半径15米的圆形样地内估算。
本研究所有数据由德国亥姆霍兹极地与海洋研究中心阿尔弗雷德·魏格纳研究所（Alfred Wegener Institute, AWI）、波茨坦大学（University of Potsdam），以及俄罗斯科学院西伯利亚分院冻土圈生物问题研究所（The Institute for Biological Problems of the Cryolithozone, Russian Academy of Sciences, Siberian Branch）、俄罗斯雅库茨克东北联邦大学自然科学研究所（The Institute of Natural Sciences, North-Eastern Federal University of Yakutsk）的科研人员共同采集完成。