Alaska2015Sep

Carbon cycling in a black spruce stands was estimated in Caribou-Poker Creek Watershed, Interior Alaska. Carbon dymanics monitoring sites were settled along the northeast-facing slope. In 2015 September, we surveyed tree census and permafrost table detection along the true north-facing slope. One site was located on upper position of the north-facing slope, the other at the lower position. Totally 160 individual trees were measured. The depth of permafrost table were estimated by penetrationg test at three points in each census plot. The permafrost depth at upper site were 47cm, 66cm, and 68cm. At the lower site, the depth were 39cm, 28cm, and 38cm.本研究针对阿拉斯加内陆卡里布-波克里克流域（Caribou-Poker Creek Watershed）内的黑云杉林（black spruce stands）开展了碳循环估算工作。碳动态监测样地沿东北向坡布设。2015年9月，研究团队在正北向坡开展了样木清查与冻土层上限（permafrost table）探测。监测样地分别设置于正北向坡的上坡位与下坡位，共计测定160株林木个体。在每个调查样地内的3个测点，通过穿透试验估算了冻土层上限深度：上坡位样地的冻土层上限深度分别为47cm、66cm与68cm，下坡位样地的对应数值则为39cm、28cm与38cm。