Spatiotemporal Features and Time-Lagged Effects of Drought on Terrestrial Ecosystem in Southwest China
With global warming, the increase in the frequency and intensity of droughts have severely affected the balance of terrestrial ecosystems. Although the immediate effects of drought on vegetation growth have been widely studied, the time-lagged effects have been neglected, particularly in ecologicall...
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MDPI AG
2023-04-01
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| Series: | Forests |
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| Online Access: | https://www.mdpi.com/1999-4907/14/4/781 |
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| author | Pan Jiang Yuxi Wang Yang Yang Xinchen Gu Yi Huang Lei Liu Liang Liu |
| author_facet | Pan Jiang Yuxi Wang Yang Yang Xinchen Gu Yi Huang Lei Liu Liang Liu |
| author_sort | Pan Jiang |
| collection | DOAJ |
| description | With global warming, the increase in the frequency and intensity of droughts have severely affected the balance of terrestrial ecosystems. Although the immediate effects of drought on vegetation growth have been widely studied, the time-lagged effects have been neglected, particularly in ecologically fragile karst areas. We examined the vegetation growth trends and abrupt changes in southwest China from 1990 to 2018 by reconstructing the normalized difference vegetation index (NDVI); we then used the standardized precipitation and evapotranspiration index (SPEI) to explore the drought evolution characteristics and the time-lagged effect of drought on vegetation growth. The results showed that 97% of the study area exhibited a greening trend, which accelerated after 1995. Spring drought increased noticeably. We demonstrated that drought had a time-lagged effect on vegetation growth; 27.28% of the vegetation lands had a lag time of less than 3 months, and the mean lagged time in karst areas was shorter than that in non-karst areas. Compared to other vegetation types, the cultivated vegetation had weaker drought resistance, while the mixed-forest had stronger tolerance to drought. This study contributes to a further understanding of the drought–vegetation relationship and has important implications for optimizing vegetation conservation strategies in southwest China while coping with climate change. |
| first_indexed | 2024-03-11T05:01:08Z |
| format | Article |
| id | doaj.art-6991a50a2d0e46cb902b088c362e9651 |
| institution | Directory Open Access Journal |
| issn | 1999-4907 |
| language | English |
| last_indexed | 2024-03-11T05:01:08Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Forests |
| spelling | doaj.art-6991a50a2d0e46cb902b088c362e96512023-11-17T19:17:48ZengMDPI AGForests1999-49072023-04-0114478110.3390/f14040781Spatiotemporal Features and Time-Lagged Effects of Drought on Terrestrial Ecosystem in Southwest ChinaPan Jiang0Yuxi Wang1Yang Yang2Xinchen Gu3Yi Huang4Lei Liu5Liang Liu6School of Economics and Management, Southwest University of Science and Technology, Mianyang 621010, ChinaChongqing Key Laboratory of Surface Process and Environment Remote Sensing in the Three Gorges Reservoir Area, Chongqing Normal University, Chongqing 401331, ChinaSchool of Sciences, Tibet University, Lhasa 850000, ChinaState Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Civil Engineering, Tianjin University, Tianjin 300072, ChinaSchool of Sciences, Tibet University, Lhasa 850000, ChinaCollege of Life Science and Biotechnology, Mianyang Normal University, Mianyang 621000, ChinaSchool of Economics and Management, Southwest University of Science and Technology, Mianyang 621010, ChinaWith global warming, the increase in the frequency and intensity of droughts have severely affected the balance of terrestrial ecosystems. Although the immediate effects of drought on vegetation growth have been widely studied, the time-lagged effects have been neglected, particularly in ecologically fragile karst areas. We examined the vegetation growth trends and abrupt changes in southwest China from 1990 to 2018 by reconstructing the normalized difference vegetation index (NDVI); we then used the standardized precipitation and evapotranspiration index (SPEI) to explore the drought evolution characteristics and the time-lagged effect of drought on vegetation growth. The results showed that 97% of the study area exhibited a greening trend, which accelerated after 1995. Spring drought increased noticeably. We demonstrated that drought had a time-lagged effect on vegetation growth; 27.28% of the vegetation lands had a lag time of less than 3 months, and the mean lagged time in karst areas was shorter than that in non-karst areas. Compared to other vegetation types, the cultivated vegetation had weaker drought resistance, while the mixed-forest had stronger tolerance to drought. This study contributes to a further understanding of the drought–vegetation relationship and has important implications for optimizing vegetation conservation strategies in southwest China while coping with climate change.https://www.mdpi.com/1999-4907/14/4/781EEMDBFASTvegetationNDVIdroughttime-lagged effect |
| spellingShingle | Pan Jiang Yuxi Wang Yang Yang Xinchen Gu Yi Huang Lei Liu Liang Liu Spatiotemporal Features and Time-Lagged Effects of Drought on Terrestrial Ecosystem in Southwest China Forests EEMD BFAST vegetation NDVI drought time-lagged effect |
| title | Spatiotemporal Features and Time-Lagged Effects of Drought on Terrestrial Ecosystem in Southwest China |
| title_full | Spatiotemporal Features and Time-Lagged Effects of Drought on Terrestrial Ecosystem in Southwest China |
| title_fullStr | Spatiotemporal Features and Time-Lagged Effects of Drought on Terrestrial Ecosystem in Southwest China |
| title_full_unstemmed | Spatiotemporal Features and Time-Lagged Effects of Drought on Terrestrial Ecosystem in Southwest China |
| title_short | Spatiotemporal Features and Time-Lagged Effects of Drought on Terrestrial Ecosystem in Southwest China |
| title_sort | spatiotemporal features and time lagged effects of drought on terrestrial ecosystem in southwest china |
| topic | EEMD BFAST vegetation NDVI drought time-lagged effect |
| url | https://www.mdpi.com/1999-4907/14/4/781 |
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