Variability of growing degree days in Poland in response to ongoing climate changes in Europe

An observed increase in air temperature can lead to significant changes in the phenology of plants and, consequently, changes in agricultural production. The aim of the study was to evaluate the spatial differentiation of thermal resources in Poland and their variability during a period of changing thermal conditions in Europe. Since the variability of thermal conditions is of paramount importance for perennial crops, the study focused on apple, plum, and cherry orchard regions in Poland. The analysis was conducted for the period of 1951–2010 using air temperature daily data. Thermal resources have been defined using the growing degree days (GDD) index calculated independently for the whole year and during in frost-free season for three air temperature thresholds: 0, 5, and 10 °C, which determine the non-winter period, growing season, and the period of full plant growth, respectively. In addition, due to the high significance for perennials in particular, the incidence and intensity of frost during flowering were calculated. In this study, a detailed analysis of the spatial differentiation of thermal resources was first performed, followed by an evaluation of long-term variability and associated change patterns. The obtained results confirmed an increase in thermal resources in Poland as a consequence of the lengthening of the growing season. However, the frequency and intensity of spring frost, especially during flowering or even during ripening of plants, remain a threat to harvests in both the eastern and western parts of the country.

[1]  R. Ahas,et al.  Changes in European spring phenology , 2002 .

[2]  B. Cook,et al.  Divergent responses to spring and winter warming drive community level flowering trends , 2012, Proceedings of the National Academy of Sciences.

[3]  R. Snyder,et al.  Determining degree-day thresholds from field observations , 1999 .

[4]  S. Solomon.  The Physical Science Basis : Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change , 2007 .

[5]  M. Trnka,et al.  Agroclimatic conditions in Europe under climate change , 2011 .

[6]  Antje Müller,et al.  Climate changes and trends in phenology of fruit trees and field crops in Germany, 1961-2000 , 2004 .

[7]  J. Walawender,et al.  Average rate of phenological changes in Poland according to climatic changes – evaluation and mapping , 2009 .

[8]  J. Winkler,et al.  Late Spring Freezes in Poland in Relation to Atmospheric Circulation , 2014 .

[9]  Senshan Yang,et al.  Mathematical formulae for calculating the base temperature for growing degree days , 1995 .

[10]  H. Storch,et al.  Statistical Analysis in Climate Research , 2000 .

[11]  T. Sparks,et al.  An examination of the relationship between flowering times and temperature at the national scale using long-term phenological records from the UK , 2000, International journal of biometeorology.

[12]  Jeffrey A. Andresen,et al.  Phenological Models of Flower Bud Stages and Fruit Growth of `Montmorency' Sour Cherry Based on Growing Degree-day Accumulation , 2006 .

[13]  Thomas Rötzer,et al.  Annual and spatial variability of the beginning of growing season in Europe in relation to air temperature changes , 2002 .

[14]  A. Bootsma,et al.  Analyses of growing degree-days for agriculture in Atlantic Canada , 1993 .

[15]  F. Chmielewski,et al.  Models for the beginning of sour cherry blossom , 2014, International Journal of Biometeorology.

[16]  P. Barbosa,et al.  European degree‐day climatologies and trends for the period 1951–2011 , 2015 .

[17]  Rik Leemans,et al.  Faculty Opinions recommendation of European phenological response to climate change matches the warming pattern. , 2006 .

[18]  T. Rötzer,et al.  Response of tree phenology to climate change across Europe , 2001 .

[19]  J. L. Anderson,et al.  Validation of Chill Unit and Flower Bud Phenology Models for 'Montmorency' Sour Cherry , 1986 .

[20]  Chang-Hoi Ho,et al.  Phenology shifts at start vs. end of growing season in temperate vegetation over the Northern Hemisphere for the period 1982–2008 , 2011 .

[21]  C. Hutchinson,et al.  Accumulated growing degree days as a model to determine key developmental stages and evaluate yield and quality of potato in Northeast Florida , 2005 .

[22]  P. Jones,et al.  A European daily high-resolution gridded data set of surface temperature and precipitation for 1950-2006 , 2008 .

[23]  Annette Menzel,et al.  Trends of spring time frost events and phenological dates in Central Europe , 2003 .

[24]  H. Mooney,et al.  Shifting plant phenology in response to global change. , 2007, Trends in ecology & evolution.

[25]  M. Soltész,et al.  Floral biology of temperate zone fruit trees and small fruits. , 1996 .

[26]  F. Chmielewski,et al.  Climatic warming above the Arctic Circle: are there trends in timing and length of the thermal growing season in Murmansk Region (Russia) between 1951 and 2012? , 2015, International Journal of Biometeorology.

[27]  G. Łysiak.  The sum of active temperatures as a method of determining the optimum harvest date of 'S̆ampion' and 'Ligol' apple cultivars. , 2012 .

[28]  Z. Kundzewicz,et al.  Climate change and its effect on agriculture, water resources and human health sectors in Poland , 2010 .

[29]  R. Bonhomme,et al.  Bases and limits to using 'degree.day' units , 2000 .

[30]  J. Winkler,et al.  Possible Impacts of Projected Temperature Change on Commercial Fruit Production in the Great Lakes Region , 2002 .

[31]  Z. W. Kundzewicz,et al.  Changes of temperature-related agroclimatic indices in Poland , 2016, Theoretical and Applied Climatology.

[32]  W. Wilhelm,et al.  Growing degree-days: one equation, two interpretations , 1997 .

[33]  A. Matzarakis,et al.  Analysis of growing degree-days as a climate impact indicator in a region with extreme annual air temperature amplitude , 2010 .

[34]  M. Sykes,et al.  Climate change threats to plant diversity in Europe. , 2005, Proceedings of the National Academy of Sciences of the United States of America.

[35]  F. Wielgolaski,et al.  Starting dates and basic temperatures in phenological observations of plants , 1999 .

[36]  Deliang Chen,et al.  Twentieth-century trends in the thermal growing season in the Greater Baltic Area , 2008 .