Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 Sterck Frank J frank.sterck@wur.nl Braun Sabine sabine.braun@iap.ch 0000-0003-4268-7659 Buchmann Nina nina.buchmann@usys.ethz.ch 0000-0003-0826-2980 Eugster Werner werner.eugster@usys.ethz.ch http://homepage.agrl.ethz.ch/~eugsterw/ 0000-0001-6067-0741 Gessler Arthur arthur.gessler@wsl.ch 0000-0002-1910-9589 Haeni Matthias matthias.haeni@wsl.ch 0000-0003-3977-2166 Peters Richard L richard.peters@wsl.ch 0000-0002-7441-1297 Walthert Lorenz lorenz.walthert@wsl.ch 0000-0002-1790-8563 Wilhelm Micah micah.wilhelm@wsl.ch 0000-0002-5022-3195 Ziemínska Kasia kasia.s.zieminska@gmail.com Etzold Sophia sophia.etzold@wsl.ch 0000-0002-5383-2228 2021 Dendrometer and meteorological data from the TreeNet network, year 2012 dataset https://doi.org/10.1594/PANGAEA.935462 2021-09-03T09:23:21 https://doi.org/10.1594/PANGAEA.935394 The timing of diel stem growth of mature forest trees is still largely unknown, as empirical data with high temporal resolution have not been available so far. Consequently, the effects of day-night conditions on tree growth remained uncertain. Here we present the first comprehensive field study of hourly-resolved radial stem growth of seven temperate tree species, based on 57 million underlying data points over a period of up to 8 years. We show that trees grow mainly at night, with a peak after midnight, when the vapour pressure deficit (VPD) is among the lowest. A high VPD strictly limits radial stem growth and allows little growth during daylight hours, except in the early morning. Surprisingly, trees also grow in moderately dry soil when the VPD is low. Species-specific differences in diel growth dynamics show that species able to grow earlier during the night are associated with the highest number of hours with growth per year and the largest annual growth increment. We conclude that species with the ability to overcome daily water deficits faster have greater growth potential. Furthermore, we conclude that growth is more sensitive than carbon uptake to dry air, as growth stops before stomata are known to close. Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 Sterck Frank J frank.sterck@wur.nl Braun Sabine sabine.braun@iap.ch 0000-0003-4268-7659 Buchmann Nina nina.buchmann@usys.ethz.ch 0000-0003-0826-2980 Eugster Werner werner.eugster@usys.ethz.ch http://homepage.agrl.ethz.ch/~eugsterw/ 0000-0001-6067-0741 Gessler Arthur arthur.gessler@wsl.ch 0000-0002-1910-9589 Haeni Matthias matthias.haeni@wsl.ch 0000-0003-3977-2166 Peters Richard L richard.peters@wsl.ch 0000-0002-7441-1297 Walthert Lorenz lorenz.walthert@wsl.ch 0000-0002-1790-8563 Wilhelm Micah micah.wilhelm@wsl.ch 0000-0002-5022-3195 Ziemínska Kasia kasia.s.zieminska@gmail.com Etzold Sophia sophia.etzold@wsl.ch 0000-0002-5383-2228 2021 Why trees grow at night journal article New Phytologist 231(6) https://doi.org/10.1111/nph.17552 2174-2185 Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 Sterck Frank J frank.sterck@wur.nl Braun Sabine sabine.braun@iap.ch 0000-0003-4268-7659 Buchmann Nina nina.buchmann@usys.ethz.ch 0000-0003-0826-2980 Eugster Werner werner.eugster@usys.ethz.ch http://homepage.agrl.ethz.ch/~eugsterw/ 0000-0001-6067-0741 Gessler Arthur arthur.gessler@wsl.ch 0000-0002-1910-9589 Haeni Matthias matthias.haeni@wsl.ch 0000-0003-3977-2166 Peters Richard L richard.peters@wsl.ch 0000-0002-7441-1297 Walthert Lorenz lorenz.walthert@wsl.ch 0000-0002-1790-8563 Wilhelm Micah micah.wilhelm@wsl.ch 0000-0002-5022-3195 Ziemínska Kasia kasia.s.zieminska@gmail.com Etzold Sophia sophia.etzold@wsl.ch 0000-0002-5383-2228 2021 Site details of trees monitored in the TreeNet network (1997-2018) dataset https://doi.org/10.1594/PANGAEA.937405 2012-01-01T00:00:00 2012-12-31T23:00:00 time series TreeNet The biological drought and growth indicator network https://treenet.info/ 6085742 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ DATE/TIME Date/Time http://en.wikipedia.org/wiki/ISO_8601 Time T http://dbpedia.org/resource/Time Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 Date/Time Identification ID Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 station_plot ID (station_plot) Identification ID Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 tree ID (tree) Species Species https://en.wikipedia.org/wiki/Species species Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 Species Growth-induced increment of stem radius Gro µm Length L http://dbpedia.org/resource/Length Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 Gro [µm] Growth rate of stem radius GRO rate µm/h growth rate http://purl.obolibrary.org/obo/PATO_0001492 Linear Velocity http://dbpedia.org/resource/Velocity Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 GRO rate [µm/h] Air temperature at 2 m height T2 °C Temperature Θ http://dbpedia.org/resource/Temperature Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 T2 [°C] Humidity, relative RH % humidity http://purl.obolibrary.org/obo/PATO_0015009 relative Dimensionless Ratio ψ Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 at 2m height RH [%] (at 2m height) Vapour pressure deficit VPD hPa Energy Density http://dbpedia.org/resource/Energy_density Force Per Area Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 VPD [hPa] Short-wave downward (GLOBAL) radiation SWD W/m**2 downward Power per Area Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 SWD [W/m**2] Soil water potential Psi Soil kPa Force Per Area Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 Psi Soil [kPa] Precipitation Precip mm/h Linear Velocity http://dbpedia.org/resource/Velocity Zweifel Roman roman.zweifel@wsl.ch 0000-0001-9438-0582 Precip [mm/h] CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels citable Climate change dendrometers drought forest ecology tree growth author35615 author53271 author56974 author56975 author58436 author58448 author75944 author75949 author83714 author83715 author83716 author83717 curlevel30 geocode1599 journal11905 license21 param104253 param149168 param149171 param149172 param149175 param2219 param31460 param48820 param7053 param7056 pi56974 project4644 ref109791 refds937405 term1073966 term2663133 term42421 term43794 term43821 term43834 term43863 term43876 term43923 term43972 term43975 term48082 term48981 term49384 term642 term69075 term69076 term69077 topotype8