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Advances in Meteorology Volume 2017 ,2017-01-24
Assessing the Impacts of the 2009/2010 Drought on Vegetation Indices, Normalized Difference Water Index, and Land Surface Temperature in Southwestern China
Research Article
Xiaoqiang Zhang 1 , 2 Yasushi Yamaguchi 1 Fei Li 2 Bin He 2 Yaning Chen 3
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DOI:10.1155/2017/6837493
Received 2016-10-26, accepted for publication 2017-01-04, Published 2017-01-04
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摘要

Droughts are projected to increase in severity and frequency on both regional and global scales. Despite the increasing occurrence and intensity of the 2009/2010 drought in southwestern China, the impacts of drought on vegetation in this region remain unclear. We examined the impacts of the 2009/2010 drought in southwestern China on vegetation by calculating the standardized anomalies of Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Normalized Difference Water Index (NDWI), and Land Surface Temperature (LST). The standardized anomalies of NDVI, EVI, and NDWI exhibited positively skewed frequency distributions, while the standardized anomalies of LST exhibited a negatively skewed frequency distribution. These results implied that the NDVI, EVI, and NDWI declined, while LST increased in the 2009/2010 drought-stricken vegetated areas during the drought period. The responses of vegetation to the 2009/2010 drought differed substantially among biomes. Savannas, croplands, and mixed forests were more vulnerable to the 2009/2010 drought than deciduous forest and grasslands, while evergreen forest was resistant to the 2009/2010 drought in southwestern China. We concluded that the 2009/2010 drought had negative impacts on vegetation in southwestern China. The resulting assessment on the impacts of drought assists in evaluating and mitigating its adverse effects in southwestern China.

授权许可

Copyright © 2017 Xiaoqiang Zhang et al. 2017
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

图表

Study area. The IGBP land cover classification was based on the MCD12Q1 data of 2008 (Collection 5, 500 m).

Distribution of the drought as detected by the averaged monthly DSI from November 2009 to March 2010 over southwestern China.

Drought areas quantified by the averaged monthly DSI from November 2009 to March 2010. D1 = incipient drought; D2 = mild drought; D3 = moderate drought; D4 = severe drought; D5 = extreme drought; ND = no drought.

Spatial distributions of standardized anomalies: (a) for NDVI, (b) for EVI, (c) for NDWI, and (d) for LST during the drought period in vegetated areas, which suffered from the 2009/2010 drought over southwestern China.

Spatial distributions of standardized anomalies: (a) for NDVI, (b) for EVI, (c) for NDWI, and (d) for LST during the drought period in vegetated areas, which suffered from the 2009/2010 drought over southwestern China.

Spatial distributions of standardized anomalies: (a) for NDVI, (b) for EVI, (c) for NDWI, and (d) for LST during the drought period in vegetated areas, which suffered from the 2009/2010 drought over southwestern China.

Spatial distributions of standardized anomalies: (a) for NDVI, (b) for EVI, (c) for NDWI, and (d) for LST during the drought period in vegetated areas, which suffered from the 2009/2010 drought over southwestern China.

Frequency distributions of standardized anomalies: (a) for NDVI, (b) for EVI, (c) for NDWI, and (d) for LST during the drought period in vegetated areas, which suffered from the 2009/2010 drought over southwestern China.

Frequency distributions of standardized anomalies: (a) for NDVI, (b) for EVI, (c) for NDWI, and (d) for LST during the drought period in vegetated areas, which suffered from the 2009/2010 drought over southwestern China.

Frequency distributions of standardized anomalies: (a) for NDVI, (b) for EVI, (c) for NDWI, and (d) for LST during the drought period in vegetated areas, which suffered from the 2009/2010 drought over southwestern China.

Frequency distributions of standardized anomalies: (a) for NDVI, (b) for EVI, (c) for NDWI, and (d) for LST during the drought period in vegetated areas, which suffered from the 2009/2010 drought over southwestern China.

Relationships between DSI and standardized anomalies: (a) for NDVI, (b) for EVI, (c) for NDWI, and (d) for LST during the drought period in vegetated areas, which suffered from the 2009/2010 drought over southwestern China.

Relationships between DSI and standardized anomalies: (a) for NDVI, (b) for EVI, (c) for NDWI, and (d) for LST during the drought period in vegetated areas, which suffered from the 2009/2010 drought over southwestern China.

Relationships between DSI and standardized anomalies: (a) for NDVI, (b) for EVI, (c) for NDWI, and (d) for LST during the drought period in vegetated areas, which suffered from the 2009/2010 drought over southwestern China.

Relationships between DSI and standardized anomalies: (a) for NDVI, (b) for EVI, (c) for NDWI, and (d) for LST during the drought period in vegetated areas, which suffered from the 2009/2010 drought over southwestern China.

Correlation coefficients between monthly DSI values and the standardized anomalies of NDVI, EVI, NDWI, and LST in vegetated areas, which suffered from the 2009/2010 drought for different plant function types. p value < 0.01, except for those marked with an asterisk (∗). DF = deciduous forest; MF = mixed forests; EF = evergreen forest; GRA = grasslands; CRO = croplands; SAV = savannas.

通讯作者

1. Xiaoqiang Zhang.Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, D2-1(510), Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan, nagoya-u.ac.jp;Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China, cas.cn.dr.xqzhang@gmail.com
2. Fei Li.Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China, cas.cn.fli@niglas.ac.cn
3. Bin He.Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China, cas.cn.hyhebin@qq.com

推荐引用方式

Xiaoqiang Zhang,Yasushi Yamaguchi,Fei Li,Bin He,Yaning Chen. Assessing the Impacts of the 2009/2010 Drought on Vegetation Indices, Normalized Difference Water Index, and Land Surface Temperature in Southwestern China. Advances in Meteorology ,Vol.2017(2017)

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