Vegetation dynamic analysis based on multisource remote sensing data in the east margin of the Qinghai-Tibet Plateau, China
This study focuses on the vegetation dynamic caused by global environmental change in the eastern margin of the Qinghai-Tibet Plateau (EMQTP). The Qinghai–Tibet Plateau (QTP) is one of the most sensitive areas responding to global environmental change, particularly global climate change, and has bee...
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| Format: | Article |
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PeerJ Inc.
2019-12-01
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| Series: | PeerJ |
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| Online Access: | https://peerj.com/articles/8223.pdf |
| _version_ | 1797420096288718848 |
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| author | Haijun Wang Peihao Peng Xiangdong Kong Tingbin Zhang Guihua Yi |
| author_facet | Haijun Wang Peihao Peng Xiangdong Kong Tingbin Zhang Guihua Yi |
| author_sort | Haijun Wang |
| collection | DOAJ |
| description | This study focuses on the vegetation dynamic caused by global environmental change in the eastern margin of the Qinghai-Tibet Plateau (EMQTP). The Qinghai–Tibet Plateau (QTP) is one of the most sensitive areas responding to global environmental change, particularly global climate change, and has been recognized as a hotspot for coupled studies on changes in global terrestrial ecosystems and global climates. An important component of terrestrial ecosystems, vegetation dynamic has become a key issue in global environmental change, and numerous case studies have been conducted on vegetation dynamic trends using multi-source data and multi-scale methods across different study periods. The EMQTP is regarded as a transitional area located between the QTP and the Sichuan basin, and has special geographical and climatic conditions. Although this area is ecologically fragile and sensitive to climate change, few studies about vegetation dynamics have been carried out in this area. Thus, in this study, we used long-term series datasets of GIMMS 3g NDVI and VGT/PROBA-V NDVI to analyze the vegetation dynamics and phenological changes from 1982 to 2018. Validation was performed based on Landsat NDVI and Vegetation Index & Phenology (VIP) data. The results reveal that the year 1998 was a vital turning point in the start of growing season (SGS) in vegetation ecosystems. Before this turning point, the SGS had an average slope of 9.2 days/decade, and after, the average slope was 3.9 days/decade. The length of growing season (LGS) was slightly prolonged between 1982 to 2015. Additionally, the largest national alpine wetland grassland experienced significant vegetation degradation; in autumn, the degraded area accounted for 63.4%. Vegetation degradation had also appeared in the arid valleys of the Yalong River and the Jinsha River. Through validation analysis, we found that the main causes of vegetation degradation are the natural degradation of wetland grassland and human activities, specifically agricultural development and residential area expansion. |
| first_indexed | 2024-03-09T06:57:42Z |
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| institution | Directory Open Access Journal |
| issn | 2167-8359 |
| language | English |
| last_indexed | 2024-03-09T06:57:42Z |
| publishDate | 2019-12-01 |
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| series | PeerJ |
| spelling | doaj.art-f909f3bbd9aa4f0688a4e86571865cee2023-12-03T10:02:55ZengPeerJ Inc.PeerJ2167-83592019-12-017e822310.7717/peerj.8223Vegetation dynamic analysis based on multisource remote sensing data in the east margin of the Qinghai-Tibet Plateau, ChinaHaijun Wang0Peihao Peng1Xiangdong Kong2Tingbin Zhang3Guihua Yi4College of Earth Science, Chengdu University of Technology, Chengdu, Sichuan, ChinaCollege of Earth Science, Chengdu University of Technology, Chengdu, Sichuan, ChinaEngineering and Technical College of Chengdu University of Technology, Leshan, Sichuan, ChinaCollege of Earth Science, Chengdu University of Technology, Chengdu, Sichuan, ChinaCollege of Earth Science, Chengdu University of Technology, Chengdu, Sichuan, ChinaThis study focuses on the vegetation dynamic caused by global environmental change in the eastern margin of the Qinghai-Tibet Plateau (EMQTP). The Qinghai–Tibet Plateau (QTP) is one of the most sensitive areas responding to global environmental change, particularly global climate change, and has been recognized as a hotspot for coupled studies on changes in global terrestrial ecosystems and global climates. An important component of terrestrial ecosystems, vegetation dynamic has become a key issue in global environmental change, and numerous case studies have been conducted on vegetation dynamic trends using multi-source data and multi-scale methods across different study periods. The EMQTP is regarded as a transitional area located between the QTP and the Sichuan basin, and has special geographical and climatic conditions. Although this area is ecologically fragile and sensitive to climate change, few studies about vegetation dynamics have been carried out in this area. Thus, in this study, we used long-term series datasets of GIMMS 3g NDVI and VGT/PROBA-V NDVI to analyze the vegetation dynamics and phenological changes from 1982 to 2018. Validation was performed based on Landsat NDVI and Vegetation Index & Phenology (VIP) data. The results reveal that the year 1998 was a vital turning point in the start of growing season (SGS) in vegetation ecosystems. Before this turning point, the SGS had an average slope of 9.2 days/decade, and after, the average slope was 3.9 days/decade. The length of growing season (LGS) was slightly prolonged between 1982 to 2015. Additionally, the largest national alpine wetland grassland experienced significant vegetation degradation; in autumn, the degraded area accounted for 63.4%. Vegetation degradation had also appeared in the arid valleys of the Yalong River and the Jinsha River. Through validation analysis, we found that the main causes of vegetation degradation are the natural degradation of wetland grassland and human activities, specifically agricultural development and residential area expansion.https://peerj.com/articles/8223.pdfMultisource remote sensingPhenology changeVegetation dynamicEMQTP |
| spellingShingle | Haijun Wang Peihao Peng Xiangdong Kong Tingbin Zhang Guihua Yi Vegetation dynamic analysis based on multisource remote sensing data in the east margin of the Qinghai-Tibet Plateau, China PeerJ Multisource remote sensing Phenology change Vegetation dynamic EMQTP |
| title | Vegetation dynamic analysis based on multisource remote sensing data in the east margin of the Qinghai-Tibet Plateau, China |
| title_full | Vegetation dynamic analysis based on multisource remote sensing data in the east margin of the Qinghai-Tibet Plateau, China |
| title_fullStr | Vegetation dynamic analysis based on multisource remote sensing data in the east margin of the Qinghai-Tibet Plateau, China |
| title_full_unstemmed | Vegetation dynamic analysis based on multisource remote sensing data in the east margin of the Qinghai-Tibet Plateau, China |
| title_short | Vegetation dynamic analysis based on multisource remote sensing data in the east margin of the Qinghai-Tibet Plateau, China |
| title_sort | vegetation dynamic analysis based on multisource remote sensing data in the east margin of the qinghai tibet plateau china |
| topic | Multisource remote sensing Phenology change Vegetation dynamic EMQTP |
| url | https://peerj.com/articles/8223.pdf |
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