Litterfall Weights From LTER Study Site Treatment Plots: 1990 - Present

Litter is measured within the nutrient treatment plots at LTER research sites located within the Bonanza Creek Experimental Forest. The 21 LTER treatment sites monitored for litterfall represent three replicates each of four successional stages of primary succession on the floodplain of the Tanana River and three stages of succession following wildfire in the uplands. Three litter trays are placed within each treatment at the 21 LTER sites. Litter trays are 0.5 m x 0.5 m wooden frames constructed of 1" x 4" boards with fine screen stapled to the bottom side. Litter is collected in the spring as soon after snowmelt as possible (usually in May) and in some years in the fall just before freeze-up as well. Litter collections bagged are removed to the lab where they are dried in ovens at 65 deg C for at least 48 hours. Each sample is then weighed to the nearest 0. 1 grams. In 2009 treatments A and C were dropped from the study after finishing the 20 year study.本研究在博纳扎溪实验森林（Bonanza Creek Experimental Forest）内的长期生态研究（Long Term Ecological Research, LTER）样地的养分处理样方中开展凋落物量测定工作。本次监测凋落物产量的21个LTER处理样地，涵盖塔那纳河漫滩上4个原生演替阶段（每个阶段设置3个重复样地），以及高地3个野火后演替阶段的样地。在21个LTER样地的每个处理样方内，均布设3个凋落物收集框。该凋落物收集框尺寸为0.5米×0.5米，由1英寸×4英寸的木板搭建而成，底面钉附有细筛网。凋落物采集通常在春季融雪后尽快开展（多为5月），部分年份还会在秋季封冻前补充采集一次。采集得到的袋装凋落物样品将被带回实验室，置于65摄氏度的烘箱中烘干至少48小时。随后将每个样品称重至精度0.1克。2009年，在完成为期20年的监测研究后，该实验移除了处理组A与处理组C。