The DOI matches its Crossref record; 50 of the 50 references it cites were found in a registry or an index.
Effects of diffuse radiation on canopy gas exchange processes in a forest ecosystem
Open accessAbstract
Forest ecosystems across the globe show an increase in ecosystem carbon uptake efficiency under conditions with high fraction of diffuse radiation. Here, we combine eddy covariance flux measurements at a deciduous temperate forest in central Germany with canopy‐scale modeling using the biophysical multilayer model CANVEG to investigate the impact of diffuse radiation on various canopy gas exchange processes and to elucidate the underlying mechanisms. Increasing diffuse radiation enhances canopy photosynthesis by redistributing the solar radiation load from light saturated sunlit leaves to nonsaturated shade leaves. Interactions with atmospheric vapor pressure deficit and reduced leaf respiration are only of minor importance to canopy photosynthesis. The response strength of carbon uptake to diffuse radiation depends on canopy characteristics such as leaf area index and leaf optical properties. Our model computations shows that both canopy photosynthesis and transpiration increase initially with diffuse fraction, but decrease after an optimum at a diffuse fraction of 0.45 due to reduction in global radiation. The initial increase in canopy photosynthesis exceeds the increase in transpiration, leading to a rise in water‐use‐efficiency. Our model predicts an increase in carbon isotope discrimination with water‐use‐efficiency resulting from differences in the leaf‐to‐air vapor pressure gradient and atmospheric vapor pressure deficit. This finding is in contrast to those predicted with simple big‐leaf models that do not explicitly calculate leaf energy balance. At an annual scale, we estimate a decrease in annual carbon uptake for a potential increase in diffuse fraction, since diffuse fraction was beyond the optimum for 61% of the data.
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Cited by
LASSLOP, G., REICHSTEIN, M., PAPALE, D., RICHARDSON, A. D., ARNETH, A., BARR, A., STOY, P., & WOHLFAHRT, G. (2010) · Global Change Biology · doi:10.1111/j.1365-2486.2009.02041.x · Cited by 1,156
Global air quality and climate
Fiore, A. M., Naik, V., Spracklen, D. V., Steiner, A., Unger, N., Prather, M., Bergmann, D., Cameron-Smith, P. J., Cionni, I., Collins, W. J., et al. (2012) · Chemical Society Reviews · doi:10.1039/c2cs35095e · Cited by 521
Ryu, Y., Jiang, C., Kobayashi, H., & Detto, M. (2018) · Remote Sensing of Environment · doi:10.1016/j.rse.2017.09.021 · Cited by 267
Ozone and haze pollution weakens net primary productivity in China
Yue, X., Unger, N., Harper, K., Xia, X., Liao, H., Zhu, T., Xiao, J., Feng, Z., & Li, J. (2017) · Atmospheric Chemistry and Physics · doi:10.5194/acp-17-6073-2017 · Cited by 258
Stratospheric sulfate geoengineering could enhance the terrestrial photosynthesis rate
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Metadata
- Authors
- Knohl, A., & Baldocchi, D. D.
- Venue
- Journal of Geophysical Research: Biogeosciences
- Publisher
- American Geophysical Union (AGU)
- Published
- 2008-05-13
- Volume
- 113
- Issue
- G2
- ISSN
- 0148-0227 (ISSN-L)
- OpenAlex
- W2030454113
- Cited by
- 290
- References
- 50
- FWCI
- 9.99
- Type
- journal article
- Language
- en
- Open access
- green
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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