Organic layer data from unburned black spruce stands used in 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 for the unburned black spruce 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) latitude and longitude of all study sites; (2) organic layer depths in burned stands; (3) organic layer depths in unburned stands; (4) basal diameters of overstory trees in unburned stands and distance measures that can be used to estimate stand density; (5) mineral soil temperature and moisture data in burned stands; (6) mineral soil temperature and moisture data in unburned stands; and (7) bulk density and percent carbon data from different organic layers in unburned stands.本数据库收录未过火黑云杉样地的地表有机层总厚度数据，相关数据用于分析过火与未过火黑云杉林分的地表有机层厚度变化特征，以及火烧深度变化对土壤温湿度及有机层碳储量的影响。 本研究的整体数据集由埃里克·卡西施克（Eric Kasischke，马里兰大学）、凯西·奥尼尔（Kathy O’Neill，杜克大学）与吉尔·约翰斯通（Jill Johnstone，阿拉斯加大学费尔班克斯分校）于1995年至2003年间采集完成。 采样点分布于三场近期火灾（1987年、1994年及1999年）的过火黑云杉林分、过火林分毗邻的未过火黑云杉林分，以及一处1956年过火的黑云杉林分内。 三场火灾分别为：(a) 1987年花岗岩溪火灾：坐落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；1994年哈朱科维奇溪火灾：坐落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；1999年唐尼利平原火灾：坐落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。 本项目关联数据库收录的采集数据包括：(1) 所有研究样地的经纬度坐标；(2) 过火林分的有机层厚度；(3) 未过火林分的有机层厚度；(4) 未过火林分上层林木的基径，以及可用于估算林分密度的距离测量数据；(5) 过火林分的矿质土壤温湿度数据；(6) 未过火林分的矿质土壤温湿度数据；(7) 未过火林分不同有机层的容重及碳百分含量数据。