Monitoring vegetation cover change in east Hunshandake savanna with Landsat TM

He, Qing; Lü, Daren

doi:10.1117/12.466816

Cited by 2 publications

(4 citation statements)

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“…The decreased trend of NDVI in the southwest-to-northeast regions was mainly caused by droughts, especially by summer droughts in 2007 and 2009. Our finding is consistent with many previous studies, which have shown that large-scale droughts reduced vegetation activities based on experimental methods, satellite observations and carbon process models. , Specifically, our results show that the BTSSR experienced intense droughts in 2001, 2005, 2007, and 2009 and the decreasing trend of NDVI result from summer droughts. , The summer drought in 2009, which was reported as the driest year in the last three decades, played a significant role in reducing the NDVI (southwest-to-northeast strip). Barriopedor analyzed the causes of the 2009–2010 drought and its impacts on vegetation in China.…”

Section: Discussionsupporting

confidence: 92%

“…Our finding is consistent with many previous studies, which have shown that large-scale droughts reduced vegetation activities based on experimental methods, 45 satellite observations 46 and carbon process models. 47 49,50 The summer drought in 2009, which was reported as the driest year in the last three decades, 27 played a significant role in reducing the NDVI (southwest-tonortheast strip). Barriopedor analyzed the causes of the 2009− 2010 drought and its impacts on vegetation in China.…”

Section: Discussionmentioning

confidence: 99%

“…47,48 Specifically, our results show that the BTSSR experienced intense droughts in 2001, 2005, 2007, and 2009 and the decreasing trend of NDVI result from summer droughts. 49,50 The summer drought in 2009, which was reported as the driest year in the last three decades, 27 played a significant role in reducing the NDVI (southwest-tonortheast strip). Barriopedor analyzed the causes of the 2009− 2010 drought and its impacts on vegetation in China.…”

Section: Discussionmentioning

confidence: 99%

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Drought Offset Ecological Restoration Program-Induced Increase in Vegetation Activity in the Beijing-Tianjin Sand Source Region, China

et al. 2014

Environ. Sci. Technol.

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To improve the ecological conditions, the Chinese government adopted six large-scale ecological restoration programs including 'Three-North Shelterbelt Project', "Grain for Green Project" and "Beijing-Tianjin Sand Source Control Project". Meanwhile, these ecologically vulnerable areas have experienced frequent droughts. However, little attention has been paid to the impact of drought on the effectiveness of these programs. Taking Beijing-Tianjin Sand Source Region (BTSSR) as study area, we investigated the role of droughts and ecological restoration program on trends of vegetation activities and to address the question of a possible "drought signal" in assessing effectiveness of ecological restoration program. The results demonstrate the following: (1) Vegetation activity increased in the BTSSR during 2000-2010, with 58.44% of the study area showing an increased NDVI, of which 11.80% had a significant increase at 0.95 confidential level. The decreasing NDVI trends were mainly concentrated in a southwest-to-northeast strip in the study area. (2) Drought was the main driving force for a decreasing trend of vegetation activity in the southwest-to-northeast regions of the BTSSR at the regional and spatial scales. Summer droughts in 2007 and 2009 contributed to the decreasing trend in NDVI. The severe and extreme droughts in summer reduced the NDVI by approximately 13.06% and 23.55%, respectively. (3) The residual analysis result showed that human activities, particularly the ecological restoration programs, have a positive impact on vegetation change. Hence, the decreasing trends in the southwest-to-northeast regions of the BTSSR cannot be explained by the improper ecological restoration program and is partly explained by droughts, especially summer droughts. Therefore, drought offset the ecological restoration program-induced increase in vegetation activity in the BTSSR.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Drought Offset Ecological Restoration Program-Induced Increase in Vegetation Activity in the Beijing-Tianjin Sand Source Region, China

et al. 2014

Environ. Sci. Technol.

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“…Otindag covers a total area of 21,400 km 2 , within which the proportion of moving sandy land increases from only 2% in 1950s to 20% in 199020% in , and 46.6% in 199920% in (Song, 2002. The Normal Difference Vegetation Index (NDVI) changes from 0.57 in 1996 to 0.33 in 2001, also showing a decreasing trend of vegetation coverage (He and Lu, 2003). Another remote sensing study (Wulan et al, 2001) in this area reports that the desertified land covers 58.8% in 2000, and the coverage proportions of heavy-, medium-, and light-desertified land are 20.5%, 27.2%, and 52.3%, respectively.…”

Section: Introductionmentioning

confidence: 95%