Global transpiration data from sap flow measurements: the SAPFLUXNET database

Abstract. Plant transpiration links physiological responses of vegetation to water supply and demand with hydrological, energy, carbon budgets at the land–atmosphere interface. However, despite being main land evaporative flux global scale, its response environmental drivers are currently not well constrained by observations. Here we introduce first compilation whole-plant data from sap flow measurements (SAPFLUXNET, https://sapfluxnet.creaf.cat/, last access: 8 June 2021). We harmonized quality-controlled individual datasets supplied contributors worldwide in a semi-automatic workflow implemented R programming language. Datasets include sub-daily time series hydrometeorological for one or more growing seasons, as metadata on stand characteristics, plant attributes, technical details measurements. SAPFLUXNET contains 202 globally distributed 2714 plants, mostly trees, 174 species. has broad bioclimatic coverage, woodland/shrubland temperate forest biomes especially represented (80 % datasets). The cover wide variety structural characteristics sizes. encompass period between 1995 2018, 50 least 3 years long. Accompanying radiation vapour pressure deficit available most datasets, while on-site soil content is 56 datasets. Many contain species that make up 90 total basal area, allowing estimation diverse ecological settings. adds existing trait ecosystem networks, remote sensing products help increase our understanding use, drought, ecohydrological processes. version 0.1.5 freely Zenodo repository (https://doi.org/10.5281/zenodo.3971689; Poyatos et al., 2020a). “sapfluxnetr” package – designed access, visualize, process CRAN.