Does Copper Contamination Affect Soil CO2 Emissions? A Literature Review

Contaminated soils are widespread and contamination is known to impact several biotic soil processes. But it still not clear what extent affects carbon efflux (CO 2 ) occurring through microfauna respiration. Regarding the large stocks of organic (Corga) stored in soils, even limited changes outputs fluxes may modify atmospheric CO concentration with important feedbacks on climate. In this study, we aimed at assessing quantifying how respiration affected by contamination. For that, performed a quantitative review literature focusing 1) heterotrophic measurements thus excluding autotrophic from plants, 2) copper contamination, 3) influence pedo-climatic parameters such as pH, clay content or type Using dataset 389 data analyzed RandomForest linear mixed statistical models, showed decrease emission an increase Specific ex-situ spiking experiments could be easily differentiated ones originated in-situ due their sharper Corga mineralization. Interestingly, spikes provided threshold Cu contents for emissions: increased inputs below 265 mgCu.kg ?1 decreased above concentration. Data long-term contaminations anthropogenic activities (industrialization, agriculture, … also displayed mineralization, much particularly industrial (smelter, sewage sludge, emissions when increased. Soil pH was identified significant driver effect emissions, C mineralization found more sensitive acidic than neutral alkaline soils. Conversely climate did significantly explain responses Finally, collected were used propose empirical equation can The cannot related, however, role sink comes together microbial biomass.