Evapotranspiration and water yield of a pine-broadleaf forest are not altered by long-term atmospheric [CO] enrichment under native or enhanced soil fertility
Global Change Biology, ISSN: 1365-2486, Vol: 24, Issue: 10, Page: 4841-4856
2018
- 19Citations
- 54Captures
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Metrics Details
- Citations19
- Citation Indexes19
- 19
- CrossRef17
- Captures54
- Readers54
- 54
Article Description
Changes in evapotranspiration (ET) from terrestrial ecosystems affect their water yield (WY), with considerable ecological and economic consequences. Increases in surface runoff observed over the past century have been attributed to increasing atmospheric CO concentrations resulting in reduced ET by terrestrial ecosystems. Here, we evaluate the water balance of a Pinus taeda (L.) forest with a broadleaf component that was exposed to atmospheric [CO] enrichment (ECO; +200 ppm) for over 17 years and fertilization for 6 years, monitored with hundreds of environmental and sap flux sensors on a half-hourly basis. These measurements were synthesized using a one-dimensional Richard's equation model to evaluate treatment differences in transpiration (T), evaporation (E), ET, and WY. We found that ECO did not create significant differences in stand T, ET, or WY under either native or enhanced soil fertility, despite a 20% and 13% increase in leaf area index, respectively. While T, ET, and WY responded to fertilization, this response was weak (<3% of mean annual precipitation). Likewise, while E responded to ECO in the first 7 years of the study, this effect was of negligible magnitude (<1% mean annual precipitation). Given the global range of conifers similar to P. taeda, our results imply that recent observations of increased global streamflow cannot be attributed to decreases in ET across all ecosystems, demonstrating a great need for model–data synthesis activities to incorporate our current understanding of terrestrial vegetation in global water cycle models.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85052697060&origin=inward; http://dx.doi.org/10.1111/gcb.14363; http://www.ncbi.nlm.nih.gov/pubmed/29949220; https://onlinelibrary.wiley.com/doi/10.1111/gcb.14363; http://doi.wiley.com/10.1111/gcb.14363; https://onlinelibrary.wiley.com/doi/abs/10.1111/gcb.14363
Wiley
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