Dicerandra christmanii demographic data

These data files consist of demographic measures taken on marked plants of the federally endangered Dicerandra christmanii from natural populations (in open gaps and roadsides), an augmented population, and introduced population. Data were collected from seven populations across two sites from 199 –2018 although populations were initiated in different years. , Sampling of the natural population of D. christmanii began in 1994 at its only known protected population Flamingo Villas Lake Wales Ridge National Wildlife Refuge (LWRNWR) owned and managed by the USFWS. Initiated in 1994, plants were sampled quarterly (January, April, July and October) at a single population (FV north road) within a 45 m by 2 m belt transect with six, 1 m wide perpendicular transects extending out at various lengths. Sampling efforts within the six belt transects were reduced to single 1 x 1 m quads in 1996 with plant tags outside the quads or longer transects pulled and coded as “no longer in transect” (code 6). Two additional transects were added in 1999; FV south road west was a 51 m long, 1 m wide transect and FV south road east was a 31 m long, 1 m wide transect. A fourth population was added in 2000, FV south gaps, sampling plants in 16 gaps. We augmented populations of D. christmanii in the southern section of Flamingo Villas LWRNWR in 2010 using seeds sown in ..., All files are CSV extensions and can be opened with most standard programs (including Excel and R).本数据集包含对联邦级濒危物种克里斯曼双蕊花（*Dicerandra christmanii*）的标记植株所采集的种群统计指标，采样对象涵盖其自然种群（分布于开阔林隙与路边生境）、1个人工扩增种群以及1个人工引入种群。数据采集工作于1994至2018年间在2个样点的7个种群中开展，尽管各种群的建立年份各不相同。 克里斯曼双蕊花的自然种群采样始于1994年，首个采样种群为已知唯一受保护的弗拉明戈别墅威尔士湖脊国家野生动物保护区（Lake Wales Ridge National Wildlife Refuge, LWRNWR）种群，该保护区由美国鱼类和野生动物管理局（United States Fish and Wildlife Service, USFWS）所有并管理。1994年启动的FV北路种群采样工作，在一条45 m×2 m的带状样带内开展，该样带设置了6条宽1 m的垂直分支样带，各分支样带长度不一；采样频次为每季度1次（1月、4月、7月、10月）。1996年，6条带状样带内的采样范围缩减为单个1 m×1 m的样方（quadrat），样方外带有标识的植株或超出原样带范围的植株被标记为"不再位于样带内"（代码6）。1999年新增2条样带：FV南路西侧样带长51 m、宽1 m，FV南路东侧样带长31 m、宽1 m。2000年新增第四个种群FV南路林隙种群，对16个林隙内的植株进行采样。 2010年，我们在弗拉明戈别墅LWRNWR南部区域通过播种种子的方式扩增了克里斯曼双蕊花种群。 所有数据文件均为CSV格式，可通过绝大多数主流程序（包括Excel与R）打开读取。