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Publication Date
29 November 2023

Increased Photosynthesis During Spring Drought in Energy-Limited Ecosystems

Subtitle
Drought increases photosynthesis in energy-limited ecosystems.
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Science

In this study, we use carbon flux observations, remote sensing, and land surface models to examine the response of photosynthesis (gross primary productivity) to meteorological drought across a spatial gradient along the water-energy limitation spectrum. 

Impact

These results highlight the need for land surface models to better account for the varying effects of meteorological drought on carbon cycling in mid- and high-latitude ecosystems.

Summary

Drought is often thought to reduce ecosystem photosynthesis. However, theory suggests there is potential for increased photosynthesis during meteorological drought, especially in energy-limited ecosystems. In this study, we examine the response of photosynthesis (gross primary productivity, GPP) to meteorological drought across the water-energy limitation spectrum. We find a consistent increase in eddy covariance GPP during spring drought in energy-limited ecosystems. Our results suggest GPP increases during spring drought for 55% of vegetated Northern Hemisphere lands ( >30° N). We then compare these results to terrestrial biosphere model outputs and remote sensing products. In contrast to trends detected in eddy covariance data, model mean GPP always declined under spring precipitation deficits after controlling for air temperature and light availability. While remote sensing products captured the observed negative spring GPP sensitivity in energy-limited ecosystems, terrestrial biosphere models proved insufficiently sensitive to spring precipitation deficits. These results highlight the need for TBMs to better account for the varying effects of meteorological drought on carbon cycling in mid- and high-latitude ecosystems.

Point of Contact
Trevor Keenan
Institution(s)
University of California Berkeley
Lawrence Berkeley National Laboratory
Funding Program Area(s)
Publication
Increased photosynthesis during spring drought in energy-limited ecosystems
Miller, David L., Sebastian Wolf, Joshua B. Fisher, Benjamin F. Zaitchik, Jingfeng Xiao, and Trevor F. Keenan. 2023. “Increased Photosynthesis During Spring Drought In Energy-Limited Ecosystems”. Nature Communications 14 (1). Springer Science and Business Media LLC. doi:10.1038/s41467-023-43430-9.