Chemical and physical characteristics of soil samples collected from a chronosequence of reforested urban sites in Lexington, KY USA.

This dataset contains information on soil physical and chemical characteristics across twenty urban reforestation sites planted as part of the Reforest the Bluegrass program in Lexington, Kentucky, USA. At least three plots (and up to nine plots) were established in each site, with additional plots added if forested patches were sufficiently large. Soil samples were collected from each plot in summer 2020. Samples were composited from five subsamples collected from plot center and approximately 1 m from plot center in the four cardinal directions. Subsamples were collected to a depth of approximately 10 cm using a sampling spade. Composite samples were air-dried and passed through a 2cm sieve, and then sent to the University of Kentucky Regulatory Services soils lab for analysis for pH, P, K, Ca, Mg, Zn, particle size distribution, total C, and total N.

本数据集收录了美国肯塔基州列克星敦市「蓝草造林计划（Reforest the Bluegrass）」项下20个城市造林场地的土壤理化特征数据。每个场地至少设置3个样地（最多9个），若林斑面积足够大则增设额外样地。2020年夏季，研究人员于每个样地采集土壤样本：样本由5份子样混合制备，子样分别采自样地中心，以及距样地中心约1米的四个正方位；子样采用采样铲采集，采样深度约10 cm。混合样本经风干后过2 cm筛，随后送往肯塔基大学监管服务土壤实验室，开展pH、磷（P）、钾（K）、钙（Ca）、镁（Mg）、锌（Zn）、粒度分布、总碳（C）及总氮（N）的检测分析。