Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2020 Jul 9;7:225. doi: 10.1038/s41597-020-0534-3

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2020

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/.

The Creative Commons Public Domain Dedication waiver http://creativecommons.org/publicdomain/zero/1.0/ applies to the metadata files associated with this article.

PMC Copyright notice

Fig. 6 — Distribution of the yearly (a) net ecosystem exchange (NEE), (b) gross primary production (GPP), and (c) ecosystem respiration (RECO) in FLUXNET2015. Only data with QC flag (NEE_VUT_REF_QC) higher than 0.5 are shown here. The values are reference NEE, GPP, and RECO based on the Variable USTAR Threshold (VUT) and selected reference for model efficiency (REF). GPP and RECO are based on the nighttime partitioning (NT) method. The grey histogram (bin width 100 gC m⁻² y⁻¹) shows the flux distribution in 1224 of the available site-years; negative GPP and RECO values are kept to preserve distributions, see Data processing methods section for details. Black lines show the distribution curves based on published data^253,254. The boxplots show the flux distribution (i.e., 25th, 50th, and 75th percentiles) for vegetation types defined and color-coded according to IGBP (International Geosphere–Biosphere Programme) definitions. Circles represent data points beyond the 1.5-times interquartile range (25th to 75th percentile) plus the 75th percentile or minus 25th percentile (whisker). Numbers in parentheses indicate the number of site-years used in each IGBP group. The NO-Blv site from the snow/ice IGBP group is not shown in the boxplots.