ZEROCALM-1_Active_layer

Active layer is measured on a welldrained white arctic bell-heather, just north of the Climate station. The site consist of 121 measuring points in a 100m x 100 m grid (11 almost N-S oriented rows each with 11 points). There are 10 m between every point. The grid nodes are numbered from 1-121. Active layer is measured manually using a metal rod. The dataset was iniated in 1996. Measurements are started as soon as the one point is free of snow in the grid. Measurements are repeated every week until all grid nodes are snow free, thereafter measurements are repeated every second week until the upper part of the soil starts to freeze.活动层（Active layer）的测量工作设于紧邻气候站北侧的一片排水良好的白色北极铃石楠（white arctic bell-heather）生境中。该研究区域布设100米×100米的网格样地，内含121个测量点位，包含11条近乎南北向的样行，每条样行布设11个测点，相邻测点间距为10米。网格节点的编号范围为1至121。活动层采用金属杆进行人工实地测量。该数据集于1996年启动建设。当网格内任一测点区域无积雪时，即可启动该点位的测量工作；在全部网格节点未完全无积雪的阶段，测量频率为每周一次，待全部网格节点均无积雪后，调整为每两周测量一次，直至土壤上层开始冻结。