Are precipitation characteristics and patterns impacting oak trees decline in the Zagros region of western Iran?
The objective was to investigate if changes in annual, monthly, and seasonal precipitation are associated with emergence of declining oak trees in Iran. Daily precipitation data were obtained from 20 synoptic stations distributed over the Zagros area from 1988-2019. Non-parametric Mann-Kendall (MK)...
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
University of Guilan
2023-10-01
|
| Series: | Caspian Journal of Environmental Sciences |
| Subjects: | |
| Online Access: | https://cjes.guilan.ac.ir/article_7122_100484b44aa130400947424e81eec2ea.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846114033174839296 |
|---|---|
| author | Pedram Attarod Samira Beiranvand Thomas Grant Pypker Vilma Bayramzadeh Jalil Helali Zahra Mashayekhi Jafar Fathi Hamid Soofi Mariv |
| author_facet | Pedram Attarod Samira Beiranvand Thomas Grant Pypker Vilma Bayramzadeh Jalil Helali Zahra Mashayekhi Jafar Fathi Hamid Soofi Mariv |
| author_sort | Pedram Attarod |
| collection | DOAJ |
| description | The objective was to investigate if changes in annual, monthly, and seasonal precipitation are associated with emergence of declining oak trees in Iran. Daily precipitation data were obtained from 20 synoptic stations distributed over the Zagros area from 1988-2019. Non-parametric Mann-Kendall (MK) test and Sen's Slope estimator (Qmed value) were applied to identify significant trends in the precipitation data. ‘‘De Martonne’’ climate classification (i.e., De Martonne aridity index (IDM) was used for climate classification. Although most stations showed decreasing trends in annual precipitation during the studied period (1988-2019), these trends were statistically significant at only two stations. The mean number of events per year pre- and post- oak decline was not significantly different (68 events before against 71 events after decline). Most of the annual precipitation in the Zagros region falls in winter and spring (80% in total). However, this ratio decreased after the year 2000 by 6% (not significant) compared with before. The difference between the average annual precipitation, before (1988-2000) and after (2000-2019) the emergence of the oak decline phenomenon, were not statistically significant in any of the climate types (semi-arid: 406 mm vs. 378 mm), Mediterranean (530 mm vs. 489 mm), and humid (924 mm vs. 912 mm) as well as in whole Zagros region (537 mm vs. 508 mm). Although our data suggested insignificant trends in precipitation for most stations, future research should investigate if rising temperature in the Zagros area has resulted in higher evaporation and drier soil thereby accelerating the oak tree decline. |
| format | Article |
| id | doaj-art-a372d8f186634730a93c59a7e39a4f10 |
| institution | Kabale University |
| issn | 1735-3033 1735-3866 |
| language | English |
| publishDate | 2023-10-01 |
| publisher | University of Guilan |
| record_format | Article |
| series | Caspian Journal of Environmental Sciences |
| spelling | doaj-art-a372d8f186634730a93c59a7e39a4f102024-12-20T22:27:27ZengUniversity of GuilanCaspian Journal of Environmental Sciences1735-30331735-38662023-10-0121475376510.22124/cjes.2023.71227122Are precipitation characteristics and patterns impacting oak trees decline in the Zagros region of western Iran?Pedram Attarod0Samira Beiranvand1Thomas Grant Pypker2Vilma Bayramzadeh3Jalil Helali4Zahra Mashayekhi5Jafar Fathi6Hamid Soofi Mariv7Department of Forestry and Forest Economics, Faculty of Natural Resources, College of Agriculture and Natural Resources, University of Tehran, Karaj, IranDepartment of Forestry and Forest Economics, Faculty of Natural Resources, College of Agriculture and Natural Resources, University of Tehran, Karaj, IranDepartment of Natural Resource Sciences, Thompson Rivers University, Kamloops, British Colombia, CanadaDepartment of Wood Science and Technology, Faculty of Agriculture and Natural Resources, Karaj Branch, Islamic Azad University, Karaj, IranDepartment of Irrigation and Reclamation Engineering, Faculty of Agricultural Engineering and Technology, College of Agriculture and Natural Resources, University of Tehran, Karaj, IranResearch Institute of Petroleum Industry, Faculty of Energy and Environment, Tehran, IranDepartment of Forestry and Forest Economics, Faculty of Natural Resources, College of Agriculture and Natural Resources, University of Tehran, Karaj, IranDepartment of Forestry and Forest Economics, Faculty of Natural Resources, College of Agriculture and Natural Resources, University of Tehran, Karaj, IranThe objective was to investigate if changes in annual, monthly, and seasonal precipitation are associated with emergence of declining oak trees in Iran. Daily precipitation data were obtained from 20 synoptic stations distributed over the Zagros area from 1988-2019. Non-parametric Mann-Kendall (MK) test and Sen's Slope estimator (Qmed value) were applied to identify significant trends in the precipitation data. ‘‘De Martonne’’ climate classification (i.e., De Martonne aridity index (IDM) was used for climate classification. Although most stations showed decreasing trends in annual precipitation during the studied period (1988-2019), these trends were statistically significant at only two stations. The mean number of events per year pre- and post- oak decline was not significantly different (68 events before against 71 events after decline). Most of the annual precipitation in the Zagros region falls in winter and spring (80% in total). However, this ratio decreased after the year 2000 by 6% (not significant) compared with before. The difference between the average annual precipitation, before (1988-2000) and after (2000-2019) the emergence of the oak decline phenomenon, were not statistically significant in any of the climate types (semi-arid: 406 mm vs. 378 mm), Mediterranean (530 mm vs. 489 mm), and humid (924 mm vs. 912 mm) as well as in whole Zagros region (537 mm vs. 508 mm). Although our data suggested insignificant trends in precipitation for most stations, future research should investigate if rising temperature in the Zagros area has resulted in higher evaporation and drier soil thereby accelerating the oak tree decline.https://cjes.guilan.ac.ir/article_7122_100484b44aa130400947424e81eec2ea.pdfclimate changemann–kendall testquercus brantii |
| spellingShingle | Pedram Attarod Samira Beiranvand Thomas Grant Pypker Vilma Bayramzadeh Jalil Helali Zahra Mashayekhi Jafar Fathi Hamid Soofi Mariv Are precipitation characteristics and patterns impacting oak trees decline in the Zagros region of western Iran? Caspian Journal of Environmental Sciences climate change mann–kendall test quercus brantii |
| title | Are precipitation characteristics and patterns impacting oak trees decline in the Zagros region of western Iran? |
| title_full | Are precipitation characteristics and patterns impacting oak trees decline in the Zagros region of western Iran? |
| title_fullStr | Are precipitation characteristics and patterns impacting oak trees decline in the Zagros region of western Iran? |
| title_full_unstemmed | Are precipitation characteristics and patterns impacting oak trees decline in the Zagros region of western Iran? |
| title_short | Are precipitation characteristics and patterns impacting oak trees decline in the Zagros region of western Iran? |
| title_sort | are precipitation characteristics and patterns impacting oak trees decline in the zagros region of western iran |
| topic | climate change mann–kendall test quercus brantii |
| url | https://cjes.guilan.ac.ir/article_7122_100484b44aa130400947424e81eec2ea.pdf |
| work_keys_str_mv | AT pedramattarod areprecipitationcharacteristicsandpatternsimpactingoaktreesdeclineinthezagrosregionofwesterniran AT samirabeiranvand areprecipitationcharacteristicsandpatternsimpactingoaktreesdeclineinthezagrosregionofwesterniran AT thomasgrantpypker areprecipitationcharacteristicsandpatternsimpactingoaktreesdeclineinthezagrosregionofwesterniran AT vilmabayramzadeh areprecipitationcharacteristicsandpatternsimpactingoaktreesdeclineinthezagrosregionofwesterniran AT jalilhelali areprecipitationcharacteristicsandpatternsimpactingoaktreesdeclineinthezagrosregionofwesterniran AT zahramashayekhi areprecipitationcharacteristicsandpatternsimpactingoaktreesdeclineinthezagrosregionofwesterniran AT jafarfathi areprecipitationcharacteristicsandpatternsimpactingoaktreesdeclineinthezagrosregionofwesterniran AT hamidsoofimariv areprecipitationcharacteristicsandpatternsimpactingoaktreesdeclineinthezagrosregionofwesterniran |