Sediment chemical and physical properties (DP1.20194.001)

Sediment samples are collected from 2 stations at each site: at wadeable streams and non-wadeable (large river) sites are divided in half longitudinally and sediment is collected throughout each half (approx. 500 m reach per station). In lakes, there are also 2 stations, the first near the buoy (the deep center point in the basin, called ‘c0’ meaning ‘center’), and the second near the near-shore infrastructure (about 1-2 m deep, called ‘in’ meaning ‘in-shore’). Within each station, sediments are collected and homogenized from depositional zones at both stations 2 times per year during the spring and fall aquatic biological sampling bouts. Homogenized aggregate samples are subsampled and shipped to an external lab for analysis, or to the NEON Biorepository for archiving. Instrumentation:

每个监测点位布设2个采样站：针对可涉水溪流与不可涉水的大型河流点位，其监测河段沿纵向均分为两段，每段（对应单个采样站约500米的河段）全域采集沉积物样品。湖泊点位同样布设2个采样站：第一个位于浮标附近（湖盆深部中心点，命名为‘c0’，意为‘中心点位’），第二个靠近近岸基础设施（水深约1-2米，命名为‘in’，意为‘近岸点位’）。每个采样站均从沉积区域采集沉积物并进行均质化处理，每年于春季和秋季的水生生物采样季开展两次采样工作。均质后的混合样品将被分样，随后送至外部实验室进行分析，或送交NEON生物样本库（NEON Biorepository）归档。仪器设备：