Figure 1
From: Potential bias of daily soil CO2 efflux estimates due to sampling time
Histogram of number of entries sorted by sampling interval reported in the Soil Respiration Database (SRDB V3.0)24. Note that the most common sampling interval is from 28–45 days (e.g., monthly, n = 1236), followed by 14–18 (e.g., biweekly, n = 542). Also note that, despite the sampling interval, the annual coverage could be less than 365 days. The total number of entries in the SRDB V3.0 is 5174, but only 3332 reported a sampling interval. The SRDB V3.0 has data from 1961 to 2011.
