RELEASE-2021

This data product contains the quality-controlled, native sampling resolution data from NEON's periodic soil sampling, as well as measurements of pH, moisture, chemistry, and stable isotopes. Samples collected as part of this product are also used for microbial measurements; those data can be found in associated data products. Soil is defined as the upper layer of the earth's surface where plants grow and consists of decomposing organic material and inorganic particles such as clay and rock. Soils are sampled by horizon type (organic or mineral) to a maximum depth of 30cm. Following field collection, all soils are measured for moisture and pH, and a subset are also measured for microbial abundance and composition, inorganic nitrogen (N) pools and total soil organic carbon (C) and nitrogen (N) by external laboratories. Frozen soil for the microbial archive is also collected for many samples, and during peak greenness chemistry bouts, excess air-dried soil is archived as well in the NEON Biorepository and available upon request. For additional details, see the user guides, protocols, and science designs listed in the Documentation section below. Queries for this data product will return field collection metadata as well as physical and chemical measurements for the specified sites within the specified date range. Summary tables of external lab precision and accuracy for chemistry and stable isotope analyses are included in the expanded package. This data product also provides field and laboratory metadata that can be associated with soil microbial data products; refer to the documentation for the respective soil microbe data products for more details. 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 Guides for more information. sls_bgcSubsampling: 90 sls_metagenomicsPooling: 90 sls_soilCoreCollection: 90 sls_soilMoisture: 90 sls_soilpH: 90 sls_soilChemistry: 270 bgc\_CNiso\_externalSummary: 30 ntr_internalLab: 90 ntr_internalLabBlanks: 90 ntr_externalLab: 180 ntr_externalSummary: 30

本数据产品包含经过质量管控的、保留原生采样分辨率的美国国家生态观测站网络（NEON, National Ecological Observatory Network）周期性土壤采样原始数据，同时涵盖pH值、含水量、化学组分及稳定同位素的测定结果。
本产品采集的土壤样本同时用于微生物相关测定，相关数据可在关联数据产品中获取。
土壤被定义为地球表面供植物生长的表层，由分解有机质及黏土、岩石等无机颗粒构成。
土壤按发生层类型（有机层或矿质层）进行采样，最大采样深度为30厘米。
野外采集完成后，所有土壤样本均会测定含水量与pH值；另有部分样本会被送至外部实验室，开展微生物丰度与群落组成、无机氮（N）库以及土壤总有机碳（C）与总氮（N）的测定。
多数样本还会采集用于微生物存档的冷冻土壤；在植被盛绿期的化学采样批次中，多余的风干土壤也会存入NEON生物样本库（NEON Biorepository），可按需申请获取。
如需获取更多详细信息，请参阅下文“文档”章节所列的用户指南、实验方案及科学设计文件。
针对该数据产品的查询，将返回指定站点、指定日期范围内的野外采集元数据（metadata），以及物理与化学测定结果。
化学分析与稳定同位素分析的外部实验室精密度与准确度汇总表已包含在扩展数据包中。
本数据产品同时提供可与土壤微生物数据产品关联的野外与实验室元数据；如需更多细节，请参阅对应土壤微生物数据产品的文档。
数据产出延迟：野外采集数据或样本至正式发布的预期时长（单位：天）如下，更多信息请参阅数据产品用户指南：
sls_bgcSubsampling: 90
sls_metagenomicsPooling: 90
sls_soilCoreCollection: 90
sls_soilMoisture: 90
sls_soilpH: 90
sls_soilChemistry: 270
bgc_CNiso_externalSummary: 30
ntr_internalLab: 90
ntr_internalLabBlanks: 90
ntr_externalLab: 180
ntr_externalSummary: 30