Data from: Conversion of arable land to perennial bioenergy crops increases soil organic carbon stocks on the long term

Perennial C4 bioenergy crops can combine high productivity and low input requirements. However, their impact on soil organic carbon (SOC) stocks remains uncertain. The aim of this study was to assess the long-term impact of converting arable land to perennial bioenergy crops on SOC stocks for two crop species (miscanthus and switchgrass) and several crop management practices (nitrogen fertilization, harvest date and irrigation). We analyzed two long-term experiments. Site 1 was located in Estrées-Mons, northern France (49.872°N, 3.013°E), and corresponded to the INRAE long-term experiment called “Biomass & Environment”. Site 2 was located in Montgaillard-Lauragais, southern France (43.433°N, 1.679°E), and was managed by Arvalis. Both sites were sampled initially and after 12 (site 1) or 13 (site 2) years. SOC concentrations, δ13C values and bulk densities were measured in order do calculate SOC stocks at equivalent soil mass and changes in “new” and “old” SOC stocks. The dataset is organised to calculate stocks at equivalent soil mass using the SimpleESM R script (https://github.com/fabienferchaud/SimpleESM).

多年生C4生物质能源作物兼具高生产力与低投入需求，但其对土壤有机碳（SOC）储量的影响仍不明确。本研究旨在评估将耕地转换为多年生生物质能源作物后，对两种供试作物（芒草miscanthus、柳枝稷switchgrass）及多种作物管理措施（氮肥施用、收获期与灌溉）下的土壤有机碳储量的长期影响。本研究共分析两个长期定位试验：试验位点1位于法国北部埃斯特雷-蒙斯（Estrées-Mons，49.872°N，3.013°E），对应法国国家农业食品与环境研究院（INRAE）命名为“Biomass & Environment”的长期定位试验；试验位点2位于法国南部蒙加亚尔-洛拉盖（Montgaillard-Lauragais，43.433°N，1.679°E），由Arvalis机构负责管理。两个试验位点均在初始采样阶段及种植12年（位点1）或13年（位点2）后完成采样。本研究测定了土壤有机碳浓度、δ13C值与土壤容重，用于计算等效土壤质量下的有机碳储量，以及“新”“旧”土壤有机碳储量的变化。本数据集可通过SimpleESM R脚本（https://github.com/fabienferchaud/SimpleESM）开展等效土壤质量下的有机碳储量计算。