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. 2020 Aug 3;11:3870. doi: 10.1038/s41467-020-17688-2

Fig. 4. Accumulated number of papers screened for this analysis.

Fig. 4

Studies were classified in soil biodiversity, function or biodiversity, and ecosystem function (BEF), according to the subject of the study (see Table 2). a corresponds to the number of studies that were not included due to the underlying data not being suited for this analysis (e.g., based on national level information) or data availability issues. Overall, ~72.6% of the total number of studies identified as suitable were included in the analysis ranging from 2004 to 2018.