Organic layer data from burned black spruce stands for the effects of variations in post-fire organic layer thickness studies in the Delta Junction region, 1995-2003

This database contains data on the total depth of the surface organic layer remaining after fire for the study plots used in an analysis of variations in the depths of surface organic layers found in burned and unburned black spruce stands, and the effects of variations in depth of burning on soil temperature and moisture, and organic layer carbon stocks. Data for the overall study were collected between 1995 and 2003 by Eric Kasischke (University of Maryland), Kathy O?Neill (Duke University), and Jill Johnstone (University of Alaska Fairbanks). Sites were located in burned black spruce stands within the perimeters of three recent fires (1987, 1994, and 1999), unburned black spruce stands adjacent to the burned stands, and within one black spruce stand that burned in 1956. The three fires were: (a) the 1987 Granite Creek fire located 15 km to the east of Delta Junction, Alaska USA, bordering the Alaska Highway on the North and Jarvis Creek on the south; the 1994 Hajdukovich Creek fire located 45 km southeast of Delta Junction Alaska, USA, bordering the Alaska Highway to the North and the Gerstle River to the West, and the 1999 Donnelly Flats fire, located 8 km south of Delta Junction, bordering Jarvis Creek to the east and the Richardson Highway on the west. Data that were collected and are in databases associated with this project include: (1) organic layer depths in burned stands; (2) organic layer depths in unburned stands; (3) basal diameters of overstory trees in unburned stands and distance measures that can be used to estimate stand density; (4) mineral soil temperature and moisture data in burned stands; (5) mineral soil temperature and moisture data in unburned stands; and (6) bulk density and percent carbon data from different organic layers in unburned stands.

本数据库收录了研究样地火烧后的地表有机层（organic layer）总残留厚度数据，该数据集用于分析火烧与未火烧黑云杉（black spruce）林分的地表有机层厚度变化特征，以及火烧深度差异对土壤温湿度及有机层碳储量（carbon stocks）的影响。本研究的全部数据由Eric Kasischke（马里兰大学）、Kathy O'Neill（杜克大学）与Jill Johnstone（阿拉斯加大学费尔班克斯分校）于1995年至2003年间采集。
样地分布于三处近期火烧迹地（1987年、1994年及1999年火场）范围内的火烧黑云杉林分、毗邻火烧林分的未火烧黑云杉林分，以及一处1956年发生过火的黑云杉林分中。三处火场分别为：
(a) 1987年花岗岩溪（Granite Creek）火场：位于美国阿拉斯加州德尔塔章克申以东15公里处，北邻阿拉斯加公路，南接贾维斯溪；
(b) 1994年哈杜科维奇溪（Hajdukovich Creek）火场：位于美国阿拉斯加州德尔塔章克申东南45公里处，北邻阿拉斯加公路，西接格斯特尔河；
(c) 1999年唐尼利平原（Donnelly Flats）火场：位于德尔塔章克申以南8公里处，东邻贾维斯溪，西接理查森公路。
本项目关联数据库所收录的采集数据包括：
(1) 火烧林分的有机层厚度；
(2) 未火烧林分的有机层厚度；
(3) 未火烧林分的上层乔木基径（basal diameters），以及可用于估算林分密度的距离测量数据；
(4) 火烧林分的矿质土壤（mineral soil）温度与湿度数据；
(5) 未火烧林分的矿质土壤温度与湿度数据；
(6) 未火烧林分不同有机层的容重（bulk density）及碳百分含量数据。