Census of trees at Blacks Mountain Experimental Forest, Lassen County, California from 1933-1934

This data publication contains original tree data collected in 1933 and 1934. The effort was done to complete a census of all trees greater than 3.5 inches diameter at breast height (dbh) at Blacks Mountain Experimental Forest (BMEF) in Lassen County, California. It was conducted under the supervision of Austin Hasel. This Experimental Forest is approximately 10,000 acres and was subdivided into 2.5-acre spatially-referenced plots for data collection. On each 2.5-acre plot, all trees greater 3.5 inches dbh were tallied by 2-inch diameter class, Dunning vigor class, and species (incense cedar, white fir, or ponderosa pine/Jeffrey pine which were combined for this study). Scans of the original field sheets are included, as well as a tabular digital version of the data.The original purpose of the study was to investigate different means of sampling forest trees in the pine region of California and also to establish a sound baseline of data to inform management of the Experimental Forest.

本数据出版物收录了1933年和1934年收集的原始树木数据。此项工作旨在完成对美国加利福尼亚州拉森县布莱克斯山实验林（BMEF）中所有胸径大于3.5英寸的树木的普查。此项工作在奥斯汀·哈塞尔的监督下进行。该实验林面积约为10,000英亩，并被划分为2.5英亩的空间参照地块以进行数据收集。在每个2.5英亩的地块上，通过2英寸直径分类、邓宁活力分类和树种（包括香柏、白冷杉或黄松/杰弗里松，这些树种在本研究中合并）对胸径大于3.5英寸的所有树木进行了统计。包含了原始现场记录的扫描件，以及数据的表格数字化版本。该研究的原始目的是探讨加利福尼亚州松树区域的森林树木不同采样方法，并建立一个可靠的数据基线，以指导实验林的管理。