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- Title
No Proportional Increase of Terrestrial Gross Carbon Sequestration From the Greening Earth.
- Authors
Zhang, Yulong; Song, Conghe; Band, Lawrence E.; Sun, Ge
- Abstract
Terrestrial vegetation, as the key component of the biosphere, has a greening trend since the beginning of this century. However, how this substantial greening translated to global gross carbon sequestration or gross primary production (GPP) is not clear. Here we investigated terrestrial GPP dynamics and the respective contributions of climate change and vegetation cover change (VCC) from 2000 to 2015. We adopted a remote sensing based data‐driven model, which was calibrated based on the global eddy flux data set (FLUXNET2015) and Moderate Resolution Imaging Spectroradiometer vegetation index data (Collection 6). A series of simulation experiments were conducted to disaggregate the effects of climate and VCC. We found a much weaker increase in global GPP (0.08%/year; P = 0.07) when compared with the global greening rate (0.23%/year; P < 0.001). The positive effect of VCC on GPP was reduced by 53% due to climate stress. Enhanced global GPP were largely contributed by nonforests, especially croplands. However, tropical forests, once a major driver of the global GPP increase, negatively contributed to global GPP trend due to warming‐induced moisture stress and deforestation. Given the limited potential of cropland carbon storage due to harvest and consumption, the contrasting GPP changes (i.e., cropland GPP increase vs. forest GPP reduction) may have shifted the distribution of the land carbon sink. Our study highlights the potential vulnerability of terrestrial gross carbon sequestration under climate and land use changes and has important implications in the global carbon cycle and climate warming mitigation. Key Points: Global terrestrial GPP did not increase in proportion to the greening on EarthEnhanced global terrestrial GPP largely contributed by nonforests, especially croplandContrasting GPP changes in forest and cropland may have shifted the distribution of land carbon sink
- Subjects
CARBON sequestration; VEGETATION &; climate; CLIMATE change; SPECTRORADIOMETER; TROPICAL forests
- Publication
Journal of Geophysical Research. Biogeosciences, 2019, Vol 124, Issue 8, p2540
- ISSN
2169-8953
- Publication type
Article
- DOI
10.1029/2018JG004917