Non-herbaceous perennial vegetation structure (DP1.10045.001)

This data product contains the quality-controlled, native sampling resolution data from in-situ structural measurements of live and standing dead non-herbaceous perennial plants, from all terrestrial NEON sites with qualifying vegetation. Non-herbaceous perennial plants include agave, cactus, ferns, ocotillo, palms, xerophyllum and yucca species. The exact measurements collected per individual depend on growth form, and these measurements are focused on biomass and productivity estimation, when suitable allometries exist, and estimation of volume. Tree Palms are the only non-herbaceous perennial individuals that are consistently mapped; smaller palms such as Serenoa repens may be mapped if no taller overstory is present in a given plot. Tagging is also generally dependent on growth form and species; qualifying individuals are tagged when tags can be efficiently relocated to enable longitudinal data collection. For example, palms are always tagged, large-stature cactus are tagged, small-stature cactus are not tagged, and ferns are never tagged. Individuals of all growth forms except tree palms may be subsampled according to a nested subplot approach in order to standardize the per plot sampling effort. Structure and mapping data are reported per individual per plot; sampling metadata, such as per growth form sampling area, are reported per plot. For additional details, see the user guide, protocols, and science design listed in the Documentation section in this data product's details webpage.

Latency:
The expected time from data and/or sample collection in the field to data publication is as follows, for each of the data tables (in days) in the downloaded data package. See the Data Product User Guide for more information.

nst_perindividual: 90

vst_perplotperyear: 300

本数据集产品包含经过质量控制的原生采样分辨率数据，源自所有符合植被筛选条件的陆地国家生态观测网（NEON）站点上活立与枯立的非草本多年生植物原位结构测量数据。非草本多年生植物涵盖龙舌兰属、仙人掌科、蕨类、沙漠木（ocotillo）、棕榈科、旱木属（xerophyllum）以及丝兰属（yucca）物种。
针对单株植物的具体测量项目取决于其生长型，此类测量聚焦于生物量与生产力估算（当存在合适的异速生长模型（allometries）时）以及体积估算。树状棕榈是唯一一类会被持续制图的非草本多年生植物；若样地内无更高层的冠层植被，则小型棕榈如锯叶棕（Serenoa repens）也会被纳入制图范围。
标记操作通常也取决于生长型与物种；当可高效重新定位标记以开展纵向监测数据采集时，符合条件的单株植物会被标记。例如，棕榈类植物始终会被标记，高大体型的仙人掌会被标记，低矮仙人掌则不会被标记，蕨类植物从不被标记。
除树状棕榈外的所有生长型单株植物，可采用嵌套样方采样法进行子采样，以标准化每块样地的采样工作量。结构与制图数据按每块样地的单株植物进行上报；采样元数据（metadata）则按样地进行上报。如需更多细节，请参阅本数据集产品详情网页中“文档”板块列出的用户指南、实验方案与科学设计文档。
延迟说明
本下载数据包中的各数据表，从野外数据和/或样本采集到数据正式发布的预期时长（单位：天）如下，更多信息请参阅《数据集产品用户指南》：
nst_perindividual：90
vst_perplotperyear：300