Brian Campbell Brian Campbell


Updated on March 24, 2020 - 7:25 AM CDT
Posted on March 18, 2020 - 2:48 PM CDT

4/14/2020 (Tue) - 12:00 PM to 1:00 PM CDT

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Event information

Tuesday, April 14, 2020 @ 1:00pm EDT (5:00pm UTC, 7:00pm CEST): GLOBE Student Tree Research Extravaganza: Students from around the GLOBE share their amazing tree research. April 2020 is all about trees. Come join students, educators, and researchers from around the world as Trees Around the GLOBE Student Research Campaign students share their tree research. From tree heights, land cover, greenings, and phenology, you will hear research projects from students all across the world that showcase measurements methods, results, and applications. Learn how these students are taking data to the next level. 


The Featured Talks:

III Osnovna Skola Varazdin, Croatia

Time of Budburst and Dynamics of Leaf Growth in Tilia cordata Mill. at Varaždin and Belišće, Croatia

In the past few years, observations have shown that tree budburst starts earlier, vegetation period of plants is prolonged and that spring begins earlier and winter later than ten years ago (Menzel, 2000). The monitoring time of budburst and dynamics of leaf growth can detect climate change and contribute to understanding how vegetation responds to climatic fluctuations during this period. We asked two questions: (1.) Does the geographical location affect the time of budburst and the vegetation period? and (2.) Which microclimate conditions have the greatest impact on time of budburst and the vegetation period? Our hypothesis is that the budburst starts earlier in Belišće due to the lower altitude and warmer microclimate, but lasts longer in Varaždin due to precipitation and that soil temperature has the greatest influence on time of budburst and precipitation on vegetation period. The study was conducted in accordance with the GLOBE Phenology Protocol (Green Up Protocol) from 2015 to 2019. From the results, it can be concluded that the geographical position does not affect the time of budburst and vegetation period and that the main factors influencing the time of budburst are the air and soil temperature and relative humidity on vegetation period. It would be a good idea to compare today's research with those of 10 or 20 years ago. Perhaps our research will be used by future generations as evidence of the impact of climate change.