Contrasting 20-year trends in NDVI at two Siberian larch forests with and without multiyear waterlogging-induced disturbances
The fate of a boreal forest may depend on the trend in its normalized difference vegetation index (NDVI), such as whether the NDVI has been increasing significantly over the past few decades. In this study, we analyzed the responses of two Siberian larch forests at Spasskaya Pad and Elgeeii in easte...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | Environmental Research Letters |
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| Online Access: | https://doi.org/10.1088/1748-9326/ac4884 |
| _version_ | 1797747123820691456 |
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| author | Hirohiko Nagano Ayumi Kotani Hiroki Mizuochi Kazuhito Ichii Hironari Kanamori Tetsuya Hiyama |
| author_facet | Hirohiko Nagano Ayumi Kotani Hiroki Mizuochi Kazuhito Ichii Hironari Kanamori Tetsuya Hiyama |
| author_sort | Hirohiko Nagano |
| collection | DOAJ |
| description | The fate of a boreal forest may depend on the trend in its normalized difference vegetation index (NDVI), such as whether the NDVI has been increasing significantly over the past few decades. In this study, we analyzed the responses of two Siberian larch forests at Spasskaya Pad and Elgeeii in eastern Siberia to various waterlogging-induced disturbances, using satellite-based NDVI and meteorological data for the 2000–2019 period. The forest at Spasskaya Pad experienced waterlogging (i.e. flooding events caused by abnormal precipitation) during 2005–2008 that damaged canopy-forming larch trees and increased the abundance of water-resistant understory vegetation. By contrast, the forest at Elgeeii did not experience any remarkable disturbance, such as tree dieback or changes in the vegetation community. Significant increasing NDVI trends were found in May and June–August at Elgeeii ( p < 0.05), whereas no significant trends were found at Spasskaya Pad ( p > 0.05). NDVI anomalies in May and June–August at Elgeeii were significantly associated with precipitation or temperature depending on the season ( p < 0.05), whereas no significant relationships were found at Spasskaya Pad ( p > 0.05). Thus, the 20 year NDVI trend and NDVI–temperature–precipitation relationship differed between the two larch forests, although no significant trends in temperature or precipitation were observed. These findings indicate that nonsignificant NDVI trends for Siberian larch forests may reflect waterlogging-induced dieback of larch trees, with a concomitant increase in water-resistant understory vegetation. |
| first_indexed | 2024-03-12T15:46:40Z |
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| id | doaj.art-1307d1b929014a15863dd6cbb1bb3bcd |
| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-12T15:46:40Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Letters |
| spelling | doaj.art-1307d1b929014a15863dd6cbb1bb3bcd2023-08-09T15:22:59ZengIOP PublishingEnvironmental Research Letters1748-93262022-01-0117202500310.1088/1748-9326/ac4884Contrasting 20-year trends in NDVI at two Siberian larch forests with and without multiyear waterlogging-induced disturbancesHirohiko Nagano0https://orcid.org/0000-0002-3090-7709Ayumi Kotani1Hiroki Mizuochi2Kazuhito Ichii3https://orcid.org/0000-0002-8696-8084Hironari Kanamori4https://orcid.org/0000-0002-9910-7806Tetsuya Hiyama5https://orcid.org/0000-0001-9080-2717Institute for Space–Earth Environmental Research (ISEE), Nagoya University , Nagoya 464-8601, Japan; Institute of Science and Technology, Niigata University , Niigata 950-2181, JapanGraduate School of Bioagricultural Sciences, Nagoya University , Nagoya 464-8601, JapanInstitute for Space–Earth Environmental Research (ISEE), Nagoya University , Nagoya 464-8601, Japan; Geological Survey of Japan (GSJ), National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba 305-8567, JapanCenter for Environmental Remote Sensing (CEReS), Chiba University , Chiba, 263-8522 , JapanInstitute for Space–Earth Environmental Research (ISEE), Nagoya University , Nagoya 464-8601, JapanInstitute for Space–Earth Environmental Research (ISEE), Nagoya University , Nagoya 464-8601, JapanThe fate of a boreal forest may depend on the trend in its normalized difference vegetation index (NDVI), such as whether the NDVI has been increasing significantly over the past few decades. In this study, we analyzed the responses of two Siberian larch forests at Spasskaya Pad and Elgeeii in eastern Siberia to various waterlogging-induced disturbances, using satellite-based NDVI and meteorological data for the 2000–2019 period. The forest at Spasskaya Pad experienced waterlogging (i.e. flooding events caused by abnormal precipitation) during 2005–2008 that damaged canopy-forming larch trees and increased the abundance of water-resistant understory vegetation. By contrast, the forest at Elgeeii did not experience any remarkable disturbance, such as tree dieback or changes in the vegetation community. Significant increasing NDVI trends were found in May and June–August at Elgeeii ( p < 0.05), whereas no significant trends were found at Spasskaya Pad ( p > 0.05). NDVI anomalies in May and June–August at Elgeeii were significantly associated with precipitation or temperature depending on the season ( p < 0.05), whereas no significant relationships were found at Spasskaya Pad ( p > 0.05). Thus, the 20 year NDVI trend and NDVI–temperature–precipitation relationship differed between the two larch forests, although no significant trends in temperature or precipitation were observed. These findings indicate that nonsignificant NDVI trends for Siberian larch forests may reflect waterlogging-induced dieback of larch trees, with a concomitant increase in water-resistant understory vegetation.https://doi.org/10.1088/1748-9326/ac4884long-term vegetation trendSiberian larch forestvegetation indexwaterlogging |
| spellingShingle | Hirohiko Nagano Ayumi Kotani Hiroki Mizuochi Kazuhito Ichii Hironari Kanamori Tetsuya Hiyama Contrasting 20-year trends in NDVI at two Siberian larch forests with and without multiyear waterlogging-induced disturbances Environmental Research Letters long-term vegetation trend Siberian larch forest vegetation index waterlogging |
| title | Contrasting 20-year trends in NDVI at two Siberian larch forests with and without multiyear waterlogging-induced disturbances |
| title_full | Contrasting 20-year trends in NDVI at two Siberian larch forests with and without multiyear waterlogging-induced disturbances |
| title_fullStr | Contrasting 20-year trends in NDVI at two Siberian larch forests with and without multiyear waterlogging-induced disturbances |
| title_full_unstemmed | Contrasting 20-year trends in NDVI at two Siberian larch forests with and without multiyear waterlogging-induced disturbances |
| title_short | Contrasting 20-year trends in NDVI at two Siberian larch forests with and without multiyear waterlogging-induced disturbances |
| title_sort | contrasting 20 year trends in ndvi at two siberian larch forests with and without multiyear waterlogging induced disturbances |
| topic | long-term vegetation trend Siberian larch forest vegetation index waterlogging |
| url | https://doi.org/10.1088/1748-9326/ac4884 |
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