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Title: Urban warming advances spring phenology but reduces the response of phenology to temperature in the conterminous United States

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

Urbanization has caused environmental changes, such as urban heat islands (UHIs), that affect terrestrial ecosystems. However, how and to what extent urbanization affects plant phenology remains relatively unexplored. Here, we investigated the changes in the satellite-derived start of season (SOS) and the covariation between SOS and temperature (RT) in 85 large cities across the conterminous United States for the period 2001–2014. We found that 1) the SOS came significantly earlier (6.1 ± 6.3 d) in 74 cities and RT was significantly weaker (0.03 ± 0.07) in 43 cities when compared with their surrounding rural areas (P < 0.05); 2) the decreased magnitude in RT mainly occurred in cities in relatively cold regions with an annual mean temperature <17.3 °C (e.g., Minnesota, Michigan, and Pennsylvania); and 3) the magnitude of urban–rural difference in both SOS and RT was primarily correlated with the intensity of UHI. Simulations of two phenology models further suggested that more and faster heat accumulation contributed to the earlier SOS, while a decrease in required chilling led to a decline in RT magnitude in urban areas. Furthermore, these findings provide observational evidence of a reduced covariation between temperature and SOS in major US cities, implying the response of spring phenology to warming conditions in nonurban environments may decline in the warming future.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1607068
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 117, Issue 8; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 89 works
Citation information provided by
Web of Science

References (41)

Land surface phenology from MODIS: Characterization of the Collection 5 global land cover dynamics product journal August 2010
Ecosystem warming extends vegetation activity but heightens vulnerability to cold temperatures journal August 2018
Land Surface Phenology and Land Surface Temperature Changes Along an Urban–Rural Gradient in Yangtze River Delta, China journal June 2013
Divergent responses to spring and winter warming drive community level flowering trends journal May 2012
Urban−rural gradients reveal joint control of elevated CO2 and temperature on extended photosynthetic seasons journal June 2019
Chilling outweighs photoperiod in preventing precocious spring development journal October 2013
Declining global warming effects on the phenology of spring leaf unfolding journal September 2015
Global warming leads to more uniform spring phenology across elevations journal December 2017
Experiments Are Necessary in Process-Based Tree Phenology Modelling journal March 2019
Advance of tree-flowering dates in response to urban climate change journal August 2006
Flowering phenology of invasive alien plant species compared with native species in three Mediterranean-type ecosystems journal November 2008
Phenology in central Europe - differences and trends of spring phenophases in urban and rural areas journal August 2000
Evaluation of MODIS land surface temperature data to estimate air temperature in different ecosystems over Africa journal February 2010
A new seasonal-deciduous spring phenology submodel in the Community Land Model 4.5: impacts on carbon and water cycling under future climate scenarios journal May 2016
How Do Urban Forests Compare? Tree Diversity in Urban and Periurban Forests of the Southeastern US journal June 2016
Phenological Patterns of Terrestrial Plants journal November 1985
Response of vegetation phenology to urbanization in the conterminous United States journal December 2016
Detecting nonlinear response of spring phenology to climate change by Bayesian analysis journal February 2013
Changes in temperature sensitivity of spring phenology with recent climate warming in Switzerland are related to shifts of the preseason journal July 2017
Growing season extended in Europe journal February 1999
A global map of urban extent from nightlights journal May 2015
Photoperiod and temperature responses of bud swelling and bud burst in four temperate forest tree species journal April 2014
Remotely sensed assessment of urbanization effects on vegetation phenology in China's 32 major cities journal April 2016
Global Change and the Ecology of Cities journal February 2008
The footprint of urban climates on vegetation phenology: FOOTPRINT OF URBAN CLIMATES ON VEGETATION journal June 2004
Sensitivity of leaf unfolding to experimental warming in three temperate tree species journal November 2013
Long-term temporal changes of plant phenology in the Western Mediterranean journal August 2009
European phenological response to climate change matches the warming pattern journal October 2006
Creating a topoclimatic daily air temperature dataset for the conterminous United States using homogenized station data and remotely sensed land skin temperature: TOPOCLIMATIC DAILY AIR TEMPERATURE journal August 2014
Urban ecological systems: Scientific foundations and a decade of progress journal March 2011
Climate change, phenology, and phenological control of vegetation feedbacks to the climate system journal February 2013
Evidence for a weakening relationship between interannual temperature variability and northern vegetation activity journal October 2014
Warming, Photoperiods, and Tree Phenology journal July 2010
Interactions between urban vegetation and surface urban heat islands: a case study in the Boston metropolitan region journal May 2016
Trees and the City: Diversity and Composition along a Neotropical Gradient of Urbanization journal January 2011
Urban phenological studies – Past, present, future journal August 2015
Urban heat island impacts on plant phenology: intra-urban variability and response to land cover journal May 2016
Greater temperature sensitivity of plant phenology at colder sites: implications for convergence across northern latitudes journal February 2017
Photoperiod constraints on tree phenology, performance and migration in a warming world: Photoperiod limits on tree climate responses journal October 2014
Effects of urbanization on flowering phenology in the metropolitan phoenix region of USA: Findings from herbarium records journal April 2010
Date of Budburst of Fifteen Tree Species in Britain Following Climatic Warming journal August 1989