PMC5358044_01
Overview on gas exchange and soil water content during the drought experiment. Gas exchange of sweet chestnut trees (#1 to #4) and soil water content during the drought stress experiment a mean total emission rate EM standardized to 30  C and 1000 micromol m-2 s-1, b mean volumetric soil water content SWC. The horizontal black line marks the SWC value where plant gas exchange start to show a response to drought. c Mean transpiration rate E; d mean net photosynthesis rate A. Error bars represent the standard error of the daytime mean (N = 4). Horizontal grey bars indicate the day after watering was stopped for plants in the drought stress variant
13007_2017_166_Fig6_HTML.jpg
PMC5358044_01_13007_2017_166_Fig6_HTML.jpg
Fig6
The higher standard errors for the CO2 and water vapor gas exchange shown in Fig. 6 are due to the two light levels within each daily measurement.