Correlation Between Tier 2 Soil Quality Indictors β-glucosidase, Fluorescein Diacetate Hydrolysis and Permanganate Oxidizable Carbon and Plant Productivity and Greenhouse Gas Emissions

We summarize peer reviewed literature reporting associations between for three ‘Tier 2’ indicators (β-glucosidase (BG), fluorescein diacetate (FDA) hydrolysis, and permanganate oxidizable carbon (POXC)) and crop yield and greenhouse gas emissions. Peer-reviewed articles published between January of 1990 and December 2017 were searched using the Thomas Reuters Web of Science database (Thomas Reuters, Philadelphia, Pennsylvania) and Google Scholar to identify studies reporting results for: “β-glucosidase”, “permanganate oxidizable carbon”, “active carbon”, “readily oxidizable carbon”, or “fluorescein diacetate hydrolysis”, together with one or more of the following: “crop yield”, “productivity”, “greenhouse gas’, “CO2”, “CH4”, or “N2O”.
Meta-data for records include associated descriptor variables and covariates useful for scoring function development which include: 1) identifying factors for the study site (location, and year in which data were reported), 2) soil textural class and pH, 3) depth of sampling, 4) analytical methods for quantification (i.e.: loss on ignition, combustion), 5) units used in published works (i.e.: equivalent mass, concentration), 6) SOC class (L,M,H), and 7) summary statistics for correlation between SQIs and functions.