Tillage systematic review data extraction files

Individual files from the systematic review on the impacts of tillage on soil organic carbon in temperate and boreal regions: https://environmentalevidencejournal.biomedcentral.com/articles/10.1186/s13750-017-0108-9#Sec53 File names correspond to those in the systematic map database.本数据集包含温带与寒带区域耕作对土壤有机碳影响的系统综述相关独立文件，来源链接：https://environmentalevidencejournal.biomedcentral.com/articles/10.1186/s13750-017-0108-9#Sec53。所有文件名与系统图谱数据库内的文件名保持一致。