Walker Branch Watershed Vegetation Inventory, 1967-2006, R1

This data set contains five data files, in comma-separated format (.csv), derived from the Walker Branch Watershed (WBW) vegetation inventory in eastern Tennessee. Field studies of permanent vegetation plots were conducted using one sampling design over a 40-year period (1967 to 2006). The data set contains long-term measurements of diameter at breast height (DBH) determined on stratified randomly-located inventory plots within the 4 different vegetation types (oak-hickory, pine-oak-hickory, pine, and mesophytic hardwoods) located in the WBW in 1967.

The WBW plot-level vegetation DBH data are provided in four files. One file contains the complete set of inventory records (139,806 observations). To accommodate spreadsheet use, the complete inventory is split into three files, one containing 52,110 observations and the other two containing 48,231 and 39,465 observations, respectively.

The fifth file contains the WBW vegetation species inventory with species names, the numeric species code for each species, a species group designation, the scientific name for each species, and the literature-derived ratio of g lignin/g N for leaves of each species.

NPP values have been reported for various forest stands at different locations within the WBW by Olson et al. (2012a, b; DeAngelis et al. (1997); and Esser (1998). Total NPP values range from 380 gC/m2/yr for forest stands dominated by yellow poplar to 790 gC/m2/yr for forest stands dominated by oaks.

Revision Notes: This updated vegetation inventory data set includes results of the 2006 survey and updates to previous results based on the latest survey. The 1967-2006 data set completely supersedes the 1967-1997 data set. If you downloaded the 1967-1997 data set before September 3, 2013, you should download the 1967-2006 version at your earliest convenience.

本数据集包含五个数据文件，以逗号分隔的格式（.csv）呈现，源自田纳西州东部沃克分支流域（WBW）的植被清单。在1967年至2006年长达40年的时间跨度内，通过统一的采样设计对永久植被样地进行实地研究。数据集收录了长期测量数据，包括胸径（DBH）的测定值，这些测量值是在沃克分支流域内4种不同植被类型（橡树-山核桃、松树-橡树-山核桃、松树和温带硬木）的分层随机分布清单样地中得出的，具体年份为1967年。

沃克分支流域的植被类型胸径数据以四个文件提供。其中一个文件包含完整的清单记录（共计139,806个观测值）。为了适应电子表格的使用，完整的清单被分割成三个文件，其中包含52,110个观测值的文件一个，以及分别包含48,231和39,465个观测值的文件各一个。

第五个文件包含了沃克分支流域的植被物种清单，包括物种名称、每个物种的数值代码、物种分组标识、每个物种的学名以及从文献中提取的每个物种叶片g木质素/g氮的比率。

Olson等人（2012a, b；DeAngelis等人，1997；Esser，1998）报道了沃克分支流域内不同地点的多种森林立地的NPP值。总NPP值范围从以黄杨树为主的森林立地的380 gC/m2/yr至以橡树为主的森林立地的790 gC/m2/yr。

修订说明：此更新的植被清单数据集包括2006年调查的结果以及基于最新调查结果的前期结果更新。1967-2006年的数据集完全取代了1967-1997年的数据集。如果您在2013年9月3日之前下载了1967-1997年的数据集，请尽快下载1967-2006年的版本。