Nevada Desert FACE Facility Soil Organic Carbon Data

This data set is the result of soils analysis from the Nevada Desert Free-Air CO2 Enrichment Facility (NDFF) experiment in the Mojave Desert and reports soil organic carbon (%C) and delta 13C stable isotope values. These soils were collected at the end of the NDFF experiment in 2007 and stored at Cornell University until analysis in 2018. Soils were harvested from 6 cover types (5 perennial vegetation covers and unvegetated interspace soils) from 0-100 cm in the soil profile in 20 cm increments. Soils were pretreated for inorganic carbon removal using an acid fumigation technique with HCl. Bulk density from NDFF plots is provided (kg soil* ha ^ -1) so that SOC stocks may be calculated. These data provide the basis for a publication challenging the prevailing idea that arid ecosystems will increase soil organic carbon stocks under long term elevated CO2.

本数据集源自莫哈韦沙漠内华达沙漠露天CO₂富集设施（Nevada Desert Free-Air CO₂ Enrichment Facility, NDFF）实验的土壤分析结果，涵盖土壤有机碳（%C）与δ¹³C稳定同位素数据。该批土壤样品采集于2007年NDFF实验结束之时，保存于康奈尔大学，直至2018年才开展分析测试。土壤样品按20cm间隔分层采集自0~100cm土壤剖面，覆盖6种覆被类型，包括5种多年生植被覆被与无植被空隙土壤。所有土壤样品均采用HCl熏蒸法进行预处理，以去除无机碳组分。本数据集同时提供NDFF样地的土壤容重数据（单位：kg·soil·ha⁻¹），方便研究者计算土壤有机碳储量。该数据集为一篇挑战主流学术观点的论文提供了核心数据支撑——该主流观点认为，长期处于高CO₂浓度环境下的干旱生态系统，其土壤有机碳储量将有所提升。