Response of Water Use Efficiency to Summer Drought in a Boreal Scots
Biogeosciences, 14, 4409–4422, 2017 https://doi.org/10.5194/bg-14-4409-2017 © Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. Response of water use efficiency to summer drought in a boreal Scots pine forest in Finland Yao Gao1, Tiina Markkanen1, Mika Aurela1, Ivan Mammarella2, Tea Thum1, Aki Tsuruta1, Huiyi Yang3, and Tuula Aalto1 1Finnish Meteorological Institute, Helsinki, P.O. Box 503, 00101, Finland 2Department of Physics, University of Helsinki, Helsinki, P.O. Box 48, 00014, Finland 3Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK Correspondence to: Yao Gao (yao.gao@fmi.fi) Received: 10 May 2016 – Discussion started: 10 June 2016 Revised: 28 August 2017 – Accepted: 4 September 2017 – Published: 29 September 2017 Abstract. The influence of drought on plant functioning has ET led to a smaller decrease in EWUE but a larger increase received considerable attention in recent years, however our in IWUE because of the severe soil moisture drought in com- understanding of the response of carbon and water coupling parison to observations. As in the observations, the simulated to drought in terrestrial ecosystems still needs to be im- uWUE showed no changes in the drought event. The model proved. A severe soil moisture drought occurred in south- deficiencies exist mainly due to the lack of the limiting effect ern Finland in the late summer of 2006. In this study, we of increased VPD on stomatal conductance during the low investigated the response of water use efficiency to summer soil moisture condition.
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