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. 2017 Sep 20;7:11925. doi: 10.1038/s41598-017-11849-y

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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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.