The influence by extreme precipitation and temperature on spring barley crop yield in Säby
(2024) In Student thesis series INES NGEM01 20231Dept of Physical Geography and Ecosystem Science
- Abstract (Swedish)
- Global warming and climate change is projected to cause intensified extreme weather events. Food production is threatened by this and crop yields have shown to be negatively affected by extreme weather events. This study examined the correlations between extreme precipitation and temperature and crop yield of spring barley in Säby in Uppsala, Sweden in 1981-2021. Crop yield of spring barley was compared with annual total precipitation and maximum temperature, as well as the same weather variables during the crop phenological stages of emergence, flowering and maturity. Output from the crop growth model Daisy provided the measured crop yield of spring barley. Finding correlations between extreme weather and crop yield was found to not be an... (More)
- Global warming and climate change is projected to cause intensified extreme weather events. Food production is threatened by this and crop yields have shown to be negatively affected by extreme weather events. This study examined the correlations between extreme precipitation and temperature and crop yield of spring barley in Säby in Uppsala, Sweden in 1981-2021. Crop yield of spring barley was compared with annual total precipitation and maximum temperature, as well as the same weather variables during the crop phenological stages of emergence, flowering and maturity. Output from the crop growth model Daisy provided the measured crop yield of spring barley. Finding correlations between extreme weather and crop yield was found to not be an easy task and previous research has demonstrated these difficulties. This study did however find statistically significant correlations between a higher maximum temperature during flowering and decreased crop yield of spring barley. Statistically significant positive correlations were also found between total amounts of annual precipitation and spring barley crop yield, as well as between total precipitation during flowering and spring barley crop yield. Modeled crop yield from Säby in Uppsala, Sweden, was compared to measured crop yield from Säby from two different sources to study Daisy's output accuracy. It became evident that the mean output in crop yield from Daisy was close to the mean from measured crop yield. However Daisy did not produce crop yield output consistent with the interannual fluctuations present in reality; modeled crop yield did not vary much from one year to another as it did in the measured crop yield data. Finding a reason in the weather as for why Daisy did not produce lower crop yields in the same years as according to the measured crop yields was not possible. It could not be made out if there was any particular extreme weather that Daisy did not take into account and that resulted in lower crop yield. Other possible reasons for why measured crop yield did not show the same interannual fluctuations were discussed in the report. The need for more advanced studies on the subject are evident and studies like this one requires more information about the site and crop techniques as well as being able to study extreme weather on a higher temporal resolution over a long period. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9177176
- author
- Källehult, Maja LU
- supervisor
- organization
- course
- NGEM01 20231
- year
- 2024
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- Physical Geography, Ecosystem Analysis, Extreme, Weather, Crop, Yield, Correlation, Agriculture, Precipitation, Temperature
- publication/series
- Student thesis series INES
- report number
- 679
- language
- English
- id
- 9177176
- date added to LUP
- 2024-10-30 09:09:16
- date last changed
- 2024-10-30 09:09:16
@misc{9177176,
abstract = {{Global warming and climate change is projected to cause intensified extreme weather events. Food production is threatened by this and crop yields have shown to be negatively affected by extreme weather events. This study examined the correlations between extreme precipitation and temperature and crop yield of spring barley in Säby in Uppsala, Sweden in 1981-2021. Crop yield of spring barley was compared with annual total precipitation and maximum temperature, as well as the same weather variables during the crop phenological stages of emergence, flowering and maturity. Output from the crop growth model Daisy provided the measured crop yield of spring barley. Finding correlations between extreme weather and crop yield was found to not be an easy task and previous research has demonstrated these difficulties. This study did however find statistically significant correlations between a higher maximum temperature during flowering and decreased crop yield of spring barley. Statistically significant positive correlations were also found between total amounts of annual precipitation and spring barley crop yield, as well as between total precipitation during flowering and spring barley crop yield. Modeled crop yield from Säby in Uppsala, Sweden, was compared to measured crop yield from Säby from two different sources to study Daisy's output accuracy. It became evident that the mean output in crop yield from Daisy was close to the mean from measured crop yield. However Daisy did not produce crop yield output consistent with the interannual fluctuations present in reality; modeled crop yield did not vary much from one year to another as it did in the measured crop yield data. Finding a reason in the weather as for why Daisy did not produce lower crop yields in the same years as according to the measured crop yields was not possible. It could not be made out if there was any particular extreme weather that Daisy did not take into account and that resulted in lower crop yield. Other possible reasons for why measured crop yield did not show the same interannual fluctuations were discussed in the report. The need for more advanced studies on the subject are evident and studies like this one requires more information about the site and crop techniques as well as being able to study extreme weather on a higher temporal resolution over a long period.}},
author = {{Källehult, Maja}},
language = {{eng}},
note = {{Student Paper}},
series = {{Student thesis series INES}},
title = {{The influence by extreme precipitation and temperature on spring barley crop yield in Säby}},
year = {{2024}},
}