Woody phenology and weather data related to Trelease Woods, Urbana, IL, USA 1993-2023

In this study, weekly phenological observations throughout spring and autumn were made annually over 30 years for 22 woody plant taxa of multiple growth forms in Trelease Woods, a mature old-growth deciduous forest remnant near Urbana, Illinois, USA. The growth forms included canopy trees, saplings, sub canopy treelets, shrubs, and vines. Data collection began in the spring of 1993 and continued through the end of autumn 2023. The phenological data set is paired with weather data collected from a nearby weather station in Champaign, Illinois. These two data sets were used to determine if dates of phenological events and durations of phenophases were changing over time, possibly in connection with changing weather related to global climate change. To supplement these phenological data, two older phenological data sets are made available here. First, Charles Smith, Woods Custodian at the University of Illinois, made comparable observations from 1949 to 1964 of seven of the same phenologic..., Field observations of spring phenology of mature individuals of 22 woody taxa (21 species and 1 genus which may have represented multiple species) were made in Trelease Woods, Champaign Co., Illinois, USA from 1993-2023. Also, observations were made of saplings of three of the canopy tree species. The study site is the north half of a 24.5 ha fragment of temperate mature deciduous forest, dominated by sugar maple near Urbana, Illinois, USA.  Elevation varies by less than 5 m across the study area.
The phenological status of each individual was recorded by the same observer (CKA) weekly from February to June of each year. Measurements were recorded and later analyzed, at the individual plant level. Within each of three vegetative phases, Bud Swell (BS), Bud Burst (BB), and Leaf Expansion (LE), three dates were noted (e.g., BS1 (1/3 of units exhibit event), BS2 (2/3 completed event), BS3 (all completed event), each date being one event; see Appendix S1: Table S1 for event summaries); the ..., , # Woody Phenology and Weather Data related to Trelease Woods, Urbana, IL, USA 1993-2023

### Authors

Carol K. Augspurger, Department of Plant Biology, University of Illinois Urbana-Champaign, [[e-mail]](mailto:[e-mail])

David N. Zaya, Illinois Natural History Survey, University of Illinois Urbana-Champaign, [[e-mail]](mailto:[e-mail])

##### References

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Augspurger, C. K. and D. N. Zaya. 2020b. Concordance of long-term shifts with climate warming varies among phenological events and herbaceous species. Ecological Monographs 90: e01421.

Hopkins, A. D. 1920a. The Bioclimatic Law. Journal of the Washington Academy of Sciences 10:34–40.

Hopkins, A. D. 1920b. The Bioclimatic Law. Monthly Weather...