Extractable soil lead (Pb) levels associated with increased soil carbon content in Mid-Atlantic turfgrass soils

We conducted an observational study at 62 golf courses at varying distances from urbanized areas in the temperate, mesic U.S. mid-Atlantic region, measuring soil carbon stocks in minimally managed areas where cool-season turfgrasses had grown without disturbance for at least 25 years. In 2009-2010, soils were sampled to 30 cm, and site and management variables were recorded. Total and permanganate oxidizable soil carbon were quantified, and potential explanatory factors were explored using multiple regression analysis. The strongest interaction that can be seen in these observations is a positive, log-log, 'broken stick' or threshold relationship between soil Pb and total soil C.  Our analysis suggests that above a threshold of ca. 4 mg extractable Pb/kg soil, lead (Pb) was strongly and positively correlated with soil carbon.  Increasing minimum daily temperature in February was also positively correlated with soil carbon, and several other correlations can be observed. L..., Context of data collection:
We utilized undisturbed soils along an urban-rural transect throughout Maryland and Washington, D.C., in the mid-Atlantic region of the U.S. to study the complex interactions of multiple global change factors *in toto. *Fifty-two public and private golf facilities in continuous operation for > 25 years were identified with the assistance of the Mid-Atlantic Association of Golf Course Superintendents in early 2009. These businesses were generous in allowing us to collect soil samples and make other observations.  The latitude and longitude of each sampling location is included in these data, but the names of the golf courses are not.
Of the 52 golf courses located, seven facilities included two entire, separate courses constructed in different years, each of which was treated as a separate, independent sampling site. Three additional facilities included single courses that spanned two clearly different soil parent materials, ascertained by comparing au..., # Extractable soil lead (Pb) levels associated with increased soil carbon content in Mid-Atlantic turfgrass soils

Dataset DOI: [10.5061/dryad.x0k6djhwt](10.5061/dryad.x0k6djhwt)

## Description of the data and file structure

We studied undisturbed soils along an urban–rural transect in Maryland and Washington, D.C., to examine the combined effects of multiple global change factors. In early 2009, we identified 52 golf facilities (in operation for over 25 years) with help from the Mid-Atlantic Association of Golf Course Superintendents. These facilities kindly allowed soil sampling and field observations. Latitude and longitude for each site are included, but golf course names are not. Seven facilities had two separate courses built in different years, each treated as an independent site. Three others had single courses spanning distinct soil parent materials, confirmed by auger sampling and soil maps; each area was sampled separately. This resulted in 62 total independent sampling sit...,

本研究在美国中大西洋温带湿润区域内62处距离城市化区域距离不等的高尔夫球场开展观测性研究，在冷季型草坪草（cool-season turfgrasses）连续生长至少25年且未受干扰的低管理区域内测定土壤碳库（soil carbon stocks）。2009-2010年，我们对土壤分层采样至30 cm深度，记录样地与管理变量。研究定量测定了总有机碳与高锰酸盐可氧化态土壤碳（permanganate oxidizable soil carbon），并通过多元回归分析（multiple regression analysis）探究潜在解释因子。本观测中最显著的交互关系为土壤铅与总土壤碳之间呈现正向对数-对数（log-log）的“折棍”（broken stick）或阈值型关系。分析结果显示，当可提取态铅阈值约为4 mg/kg土壤时，铅（Pb）与土壤碳呈现显著正相关关系。2月最低日温升高同样与土壤碳含量呈正相关，此外还观测到其他若干相关关系。L...

数据采集背景：
我们依托美国中大西洋地区马里兰州与华盛顿特区沿线的城乡样带（urban-rural transect）上的未扰动土壤，整体探究多重全球变化因子（global change factors）间的复杂交互作用。2009年初，我们在中大西洋高尔夫球场总监协会（Mid-Atlantic Association of Golf Course Superintendents）的协助下，筛选出52家持续运营超过25年的公共与商业高尔夫球场。这些球场慷慨许可我们开展土壤采样与其他观测工作。本数据集包含每个采样点的经纬度信息，但未披露高尔夫球场名称。在已筛选的52座球场中，有7家球场包含两座建于不同年份的独立完整球场，每座均作为独立采样点处理。另有3家球场的单座球场覆盖两种显著不同的土壤母质（soil parent materials），该结论通过钻孔采样（auger sampling）与土壤图比对确认，每个区域均单独采样。au...

# 美国中大西洋地区草坪草土壤中与土壤碳含量提升相关的可提取态铅（Pb）水平
数据集DOI：10.5061/dryad.x0k6djhwt

数据与文件结构说明
我们针对马里兰州与华盛顿特区的城乡样带未扰动土壤开展研究，以解析多重全球变化因子的联合效应。2009年初，我们借助中大西洋高尔夫球场总监协会的协助，筛选出52家持续运营超过25年的高尔夫球场。这些球场允许我们开展土壤采样与野外观测。数据集包含每个样地的经纬度信息，但未披露球场名称。其中7家球场拥有两座建于不同年份的独立球场，每座均作为独立采样点。另有3家球场的单座球场覆盖不同的土壤母质，经钻孔采样与土壤图确认后，对每个区域单独采样。最终共计得到62个独立采样点位sit...