Stand structure for Joshua trees (Yucca brevifolia and Y. jaegeriana) in the eastern Mojave Desert of California, 2022 plot data

These data were compiled to measure the stand structure, including age class distribution, of Joshua tree (Yucca brevifolia and Y. jaegeriana) as measured on 61 1000 m2 plots.The objective of our study was to provide the U.S. Fish and Wildlife Service with demographic data, particularly on recruitment, of the Joshua trees for their use in decisions that the Service makes for the management of Joshua trees. These data represent tree height, number of trees by age class as represented by height, and some environmental characteristics of each plot. These data were collected in the spring and early fall 2022 in the eastern Mojave of California with plot locations adjacent to plots that had been allocated in 1997 using a stratified random sampling design. The plots naturally had a more northern group and a more southern group on Bureau of Land Management, the Mojave National Preserve, and Death Valley National Park lands.  These data were collected with field observations by technicians of the U.S. Geological Survey. The data provide a summary of Joshua tree stand structure including recruitment of trees. Recruitment data for the Joshua tree in the easter Mojave will benefit the decisions that the public land managers make for the long-term viability of the Joshua tree.

本数据集旨在通过61个1000平方米样地的野外调查，测定约书亚树（Yucca brevifolia与Y. jaegeriana）的林分结构，涵盖其龄级分布特征。本研究的核心目标是为美国鱼类及野生动物管理局（U.S. Fish and Wildlife Service）提供约书亚树的种群统计数据，尤其是种群补充相关数据，以供该局在约书亚树管理决策中参考应用。本数据集包含各样地的树木高度、基于高度划分的各龄级个体数量，以及各样地的部分环境特征参数。调查工作于2022年春季及初秋在加利福尼亚州东莫哈韦地区开展，样地位置与1997年采用分层随机抽样设计布设的样地相邻。这些样地分布于美国土地管理局（Bureau of Land Management）、莫哈韦国家保护区及死亡谷国家公园的管辖范围内，自然形成北部与南部两个地理集群。本数据集由美国地质调查局（U.S. Geological Survey）的技术人员通过实地观测采集完成。本数据集系统总结了约书亚树的林分结构特征，包括种群补充情况。东莫哈韦地区约书亚树的种群补充数据，将为公共土地管理者制定决策、保障约书亚树的长期生存存续提供关键支撑。