Journal
GLOBAL CHANGE BIOLOGY
Volume 24, Issue 10, Pages 4841-4856Publisher
WILEY
DOI: 10.1111/gcb.14363
Keywords
-
Funding
- Biological and Environmental Research [DE-AC05-00OR22725, DE-SC0006967]
- Erkko Visiting Professor Programme of the Jane and Aatos Erkko 375th Anniversary Fund
- Chinese Academy of Sciences [2016VBA036]
- Korea Forest Service [S111215L020100]
- U.S. Department of Energy
- Office of Science
- Office of Biological and Environmental Research [DE-AC05-00OR22725]
Ask authors/readers for more resources
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 CO2 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 [CO2] enrichment (ECO2; +200ppm) for over 17years and fertilization for 6years, 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 ECO2 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 ECO2 in the first 7years 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available