Global soil organisms

Global distribution of soil organisms. Data deposited in this project represent unique (non-clustered) sequences. These sequences are members of the curated OTU list (tag-jump filtered and chimera-free, clustered at 98% similarity threshold) from the GSMc dataset (Tedersoo et al., Fungal Diversity, 2021, https://doi.org/10.1007/s13225-021-00493-7). For each OTU in each sample, within-OTU sequences were dereplicated ignoring terminal gaps; in the presence of sequence variants differing only in the length of homopolymeric regions, only the most abundant variant was preserved. Taxonomic annotation was transferred from the representative sequence of each OTU to all unique sequences clustered in it. The current dataset includes additional soil samples not covered by the published article (Tedersoo et al., Fungal Diversity, 2021). Additional samples were collected following a slightly different sampling protocol. Taxon occurrences originating from these samples can be filtered out by Dataset name ('Global soil samples subproject (sequences from additional samples)') and Dataset ID (108273). The number of distinct sampling sites: 3 736, sampling events: 4 514. The number of unique taxa based on UNITE species hypotheses on 1.5% distance threshold: 292 413.

土壤生物全球分布数据集。本项目所提交的数据均为非聚类的独特序列。这些序列来自GSMc数据集经质控后的操作分类单元（Operational Taxonomic Unit, OTU）列表，该列表已完成标签跳跃过滤与嵌合体去除，并以98%相似度阈值完成聚类（Tedersoo等，《真菌多样性》，2021，https://doi.org/10.1007/s13225-021-00493-7）。针对每个样本中的每个OTU，我们对OTU内部的序列进行去重复处理，忽略末端缺口；若存在仅均聚物区域长度存在差异的序列变体，则仅保留丰度最高的变体。分类学注释从每个OTU的代表序列传递至其聚类内的所有独特序列。本数据集包含已发表论文（Tedersoo等，《真菌多样性》，2021）未覆盖的额外土壤样本，此类样本采用略有差异的采样方案完成采集。可通过数据集名称（"Global soil samples subproject (sequences from additional samples)"）与数据集ID（108273）滤除来自这些样本的类群出现记录。本次数据集涵盖的独立采样点共计3736个，采样事件共计4514次。基于UNITE物种假说、以1.5%距离阈值划分的独特类群数量为292413个。