Soil physical, chemical, and root data from forest stands at Thompson Farm in Durham, NH

In July 2019, quantitative soil pits were excavated alongside replicate power cores from three mature oak-pine forest stands at Thompson Farm (Durham, NH) to characterize soil physical and chemistry properties as well as root depth profiles in control and treatment plots associated with the Thompson Farm DroughtNet project, as well as in the footprint of the Ameriflux tower. Mean total sampling depth across all pits and cores was 84cm, though half of samples reached 100 cm or deeper. Chemical and isotopic analyses for each sample layer include pH, total N, total C, and stable isotope ratios of N and C. Physical data include soil mass, rock volume, bulk density, and soil texture. Oven-dried root mass in each sample layer was recorded in multiple size categories (from pits) or sorted to species (from power cores).

2019年7月，研究团队于新罕布什尔州达勒姆市的汤普森农场（Thompson Farm）3处成熟栎松林分中，同步开挖定量土壤坑并采集重复动力土芯，以表征汤普森农场干旱网络（Thompson Farm DroughtNet）项目对照组与处理组样地、以及Ameriflux通量塔（Ameriflux tower）足迹区内的土壤物理、化学性质与根系深度剖面。所有土壤坑与土芯的平均总采样深度为84厘米，不过半数样本的采样深度可达100厘米及以上。各样本层的化学与同位素分析指标包含pH值、总氮（total N）、总碳（total C），以及氮、碳的稳定同位素比值；物理分析指标涵盖土壤质量、石块体积、容重（bulk density）与土壤质地（soil texture）。针对各样本层的烘干根系生物量，研究人员按多个粒径类别（取自土壤坑样本）或物种分类（取自动力土芯样本）完成了记录。