ABSTRACT:

This resource provides environmental, tree physiological, and hydroclimate datasets and associated processing code supporting the manuscript “Contrasting invasive and native tree–water relations portend shifting community structure in Pacific Northwest forests” by Drucker et al.

Data were collected in coastal British Columbia, Canada during the 2025 summer drought to characterize the water relations of Ilex aquifolium (holly) and Thuja plicata (western redcedar), along with surrounding environmental conditions. The dataset includes in situ measurements of precipitation, solar radiation (solar flux), air temperature, relative humidity, soil volumetric water content, and groundwater levels. Tree physiological measurements include monthly leaf water potential, turgor loss point, and sap flow. In addition, long-term hydroclimate datasets used to assess moisture deficit trends and streamflow dynamics are included.

All datasets are provided as Microsoft Excel (.xlsx) workbooks, some organized across multiple worksheets, with accompanying metadata. Processing code is supplied as Python (.ipynb) notebooks, originally executed in Google Colab. Most analyses can be reproduced by storing the data in the specified Google Drive directory structure; alternatively, file paths may be modified to load local files as Pandas dataframes. Select hydroclimate analyses require access to a Google Earth Engine account.

ABSTRACT:

Analysis of water mass balance variables with the goal of identifying temporal patterns and approximating subsurface water storage for the North Alouette River catchment located ~50 km east of Vancouver. This effort is part of a larger, ongoing ecohydrology research project through Simon Fraser University.