Spatial-Temporal NDVI Variation of Different Alpine Grassland Classes and Groups in Northern Tibet from 2000 to 2013
The Normalized Difference Vegetation Index (NDVI) can usually be used as a good proxy for evaluating potential variability in regional ecosystems and under climate change. We used 16-day MODIS-NDVI composite satellite data with 250-m resolution for the period 2000 to 2013 to assess the temporal and...
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| Format: | Article |
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International Mountain Society
2015-08-01
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| Series: | Mountain Research and Development |
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| Online Access: | http://www.bioone.org/doi/full/10.1659/MRD-JOURNAL-D-14-00110.1 |
| _version_ | 1818911579027013632 |
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| author | Xiaoke Zhang Xuyang Lu Xiaodan Wang |
| author_facet | Xiaoke Zhang Xuyang Lu Xiaodan Wang |
| author_sort | Xiaoke Zhang |
| collection | DOAJ |
| description | The Normalized Difference Vegetation Index (NDVI) can usually be used as a good proxy for evaluating potential variability in regional ecosystems and under climate change. We used 16-day MODIS-NDVI composite satellite data with 250-m resolution for the period 2000 to 2013 to assess the temporal and spatial variation of the NDVI among different alpine grassland classes and groups in northern Tibet. The annual average NDVI of the whole alpine grassland area in northern Tibet generally increased slightly from 2000 to 2003, and the annual average NDVI values ranged from 0.112 to 0.492 across all alpine grassland groups and years. The NDVI clearly decreased from the southeastern to the northwestern areas, with 22.50% of total grasslands significantly having increased or decreased, while 77.50% presented little change during 2000–2013. Both temperature and precipitation were key factors that controlled the NDVI variations of the entire alpine grassland. However, for different alpine grassland classes and groups, the NDVI displayed different correlation patterns with temperature and precipitation. Our results demonstrate that the NDVI variations of alpine grassland generally increased slightly but differed among different classes and groups. Although temperature and precipitation were the driving forces influencing the NDVI of the entire alpine grassland, it was more difficult to define the driving forces for the individual classes and groups, and more detailed analyses covering prolonged observation periods are still needed. |
| first_indexed | 2024-12-19T23:00:56Z |
| format | Article |
| id | doaj.art-613daf5f00e44728bb01f8855111f0fd |
| institution | Directory Open Access Journal |
| issn | 0276-4741 1994-7151 |
| language | English |
| last_indexed | 2024-12-19T23:00:56Z |
| publishDate | 2015-08-01 |
| publisher | International Mountain Society |
| record_format | Article |
| series | Mountain Research and Development |
| spelling | doaj.art-613daf5f00e44728bb01f8855111f0fd2022-12-21T20:02:31ZengInternational Mountain SocietyMountain Research and Development0276-47411994-71512015-08-0135325426310.1659/MRD-JOURNAL-D-14-00110.1Spatial-Temporal NDVI Variation of Different Alpine Grassland Classes and Groups in Northern Tibet from 2000 to 2013Xiaoke Zhang0Xuyang Lu1Xiaodan Wang2Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, CAS, 610041 Chengdu, China; University of Chinese Academy of Sciences, 100049 Beijing, ChinaKey Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, CAS, 610041 Chengdu, China; Xainza Alpine Steppe and Wetland Ecosystem Observation and Experiment Station, CAS, 853100 Xainza, China; xylu@imde.ac.cnKey Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, CAS, 610041 Chengdu, China; Xainza Alpine Steppe and Wetland Ecosystem Observation and Experiment Station, CAS, 853100 Xainza, China; wxd@imde.ac.cnThe Normalized Difference Vegetation Index (NDVI) can usually be used as a good proxy for evaluating potential variability in regional ecosystems and under climate change. We used 16-day MODIS-NDVI composite satellite data with 250-m resolution for the period 2000 to 2013 to assess the temporal and spatial variation of the NDVI among different alpine grassland classes and groups in northern Tibet. The annual average NDVI of the whole alpine grassland area in northern Tibet generally increased slightly from 2000 to 2003, and the annual average NDVI values ranged from 0.112 to 0.492 across all alpine grassland groups and years. The NDVI clearly decreased from the southeastern to the northwestern areas, with 22.50% of total grasslands significantly having increased or decreased, while 77.50% presented little change during 2000–2013. Both temperature and precipitation were key factors that controlled the NDVI variations of the entire alpine grassland. However, for different alpine grassland classes and groups, the NDVI displayed different correlation patterns with temperature and precipitation. Our results demonstrate that the NDVI variations of alpine grassland generally increased slightly but differed among different classes and groups. Although temperature and precipitation were the driving forces influencing the NDVI of the entire alpine grassland, it was more difficult to define the driving forces for the individual classes and groups, and more detailed analyses covering prolonged observation periods are still needed.http://www.bioone.org/doi/full/10.1659/MRD-JOURNAL-D-14-00110.1Normalized Difference Vegetation Index (NDVI)alpine grasslandprecipitationtemperaturenorthern Tibet |
| spellingShingle | Xiaoke Zhang Xuyang Lu Xiaodan Wang Spatial-Temporal NDVI Variation of Different Alpine Grassland Classes and Groups in Northern Tibet from 2000 to 2013 Mountain Research and Development Normalized Difference Vegetation Index (NDVI) alpine grassland precipitation temperature northern Tibet |
| title | Spatial-Temporal NDVI Variation of Different Alpine Grassland Classes and Groups in Northern Tibet from 2000 to 2013 |
| title_full | Spatial-Temporal NDVI Variation of Different Alpine Grassland Classes and Groups in Northern Tibet from 2000 to 2013 |
| title_fullStr | Spatial-Temporal NDVI Variation of Different Alpine Grassland Classes and Groups in Northern Tibet from 2000 to 2013 |
| title_full_unstemmed | Spatial-Temporal NDVI Variation of Different Alpine Grassland Classes and Groups in Northern Tibet from 2000 to 2013 |
| title_short | Spatial-Temporal NDVI Variation of Different Alpine Grassland Classes and Groups in Northern Tibet from 2000 to 2013 |
| title_sort | spatial temporal ndvi variation of different alpine grassland classes and groups in northern tibet from 2000 to 2013 |
| topic | Normalized Difference Vegetation Index (NDVI) alpine grassland precipitation temperature northern Tibet |
| url | http://www.bioone.org/doi/full/10.1659/MRD-JOURNAL-D-14-00110.1 |
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