Hubbard Brook Experimental Forest: Soil Profile Maps and Horizon Thicknesses on Watershed 5, 1983-1998

We sampled soils prior to the whole-tree harvest of watershed 5 at
Hubbard Brook Experimental Forest in 1983, and again in 1986, 1991,
and 1998, using the quantitative soil pit method. Here we report
horizon thicknesses and present hand drawn maps of the sides of a
subset of the 239 sampling pits excavated over the four sampling
years. Note that U.S. standard soil horizon nomenclature changed
between 1983 and 1986. In nearly all cases, the 1983 horizon
designations have the following equivalencies: A2 = E, Bhir = Bs, Bir
= Bs1, B23 and B23+ = Bs2. These data were gathered as part of the Hubbard Brook Ecosystem Study
(HBES). The HBES is a collaborative effort at the Hubbard Brook
Experimental Forest, which is operated and maintained by the USDA
Forest Service, Northern Research Station.  An analysis of these data has been published in: Johnson, C.E., A.H.
Johnson, T.G. Huntington, and T.G. Siccama. 1991. Whole-tree
clear-cutting effects on soil horizons and organic-matter pools. Soil
Science Society of America Journal. 55:497-502.
https://doi.org/10.2136/sssaj1991.03615995005500020034x

1983年，我们在哈伯德布鲁克实验林（Hubbard Brook Experimental Forest）的5号集水区全树采伐前采集土壤样本，并于1986年、1991年及1998年采用定量土坑采样法开展重复采样。本文报告了四次采样年度内挖掘的239个采样土坑的子集的土壤发生层厚度，并附上了对应土坑侧壁的手绘图。
需注意，美国标准土壤发生层命名规范在1983年至1986年间发生了变更。在绝大多数情况下，1983年的发生层标识存在如下对应关系：A2 = E、Bhir = Bs、Bir = Bs1、B23与B23+ = Bs2。
本数据集作为哈伯德布鲁克生态系统研究（Hubbard Brook Ecosystem Study, HBES）的一部分收集完成。HBES是由美国农业部（USDA）林务局北部研究站运营维护的哈伯德布鲁克实验林合作研究项目。
针对该数据集的分析成果已发表于：Johnson, C.E., A.H. Johnson, T.G. Huntington, 及 T.G. Siccama. 1991. 全树皆伐对土壤发生层及有机质库的影响. 《美国土壤学会志》. 55:497-502. https://doi.org/10.2136/sssaj1991.03615995005500020034x