The effects of climate change on normalized difference vegetation index (NDVI) in the Northeast of Iran

Bagherzadeh, Ali; Hoseini, Abdollah Vosugh; Totmaj, Leila Homami

doi:10.1007/s40808-020-00724-x

“…The NDVI index has been applied to many scientific studies worldwide. Bagherzadeh et al confirmed the utility of the NDVI to express the vegetation variability under semiarid climate conditions [45]. The results of several studies utilizing NDVI time series revealed the recent increase in the vegetation efficiency in karst regions [11,[46][47][48], indicating that the NDVI of each vegetation type is variable.…”

Section: Introductionmentioning

confidence: 90%

“…The results of several studies utilizing NDVI time series revealed the recent increase in the vegetation efficiency in karst regions [11,[46][47][48], indicating that the NDVI of each vegetation type is variable. The long-term NDVI can be used to indicate vegetation trends [45,49,50] and monitor local, regional, and global trends as well as vegetation inconsistencies [51,52]. Evans reported that the viable rainfed agricultural land area has decreased by >170,000 km 2 until the end of the 20th century in the Middle East (ME) due to climate change [53].…”

Section: Introductionmentioning

confidence: 99%

Anthropogenic Factors Affecting the Vegetation Dynamics in the Arid Middle East

Rousta¹,

Ólafsson²,

Zhang³

et al. 2020

Preprint

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The spatiotemporal variability of vegetation in the Middle East was investigated for the period 2001–2019 using the Moderate Resolution Imaging Spectroradiometer (MODIS) 16-day/500 m composites of the Normalized Difference Vegetation Index (NDVI; MOD13A1). The results reveal a strong increase in the NDVI coverage in the Middle East during the study period (R = 0.75, p-value = 0.05). In Egypt, the annual coverage exhibits the strongest positive trend (R = 0.99, p-value = 0.05). In Turkey, both the vegetation coverage and density increased from 2001 to 2019, which can be attributed to the construction of some of the biggest dams in the Middle East, such as the Atatürk and Ilisu dams. Significant increases in the annual coverage and maximum and average NDVI in Saudi Arabia are due to farming in the northern part of the country for which groundwater and desalinated seawater are used. The results of this study suggest that the main factors affecting the vegetation coverage in the Middle East are governmental policies. These policies can have a positive effect on the vegetation coverage in some countries such as Egypt, Saudi Arabia, Qatar, Kuwait, Iran, and Turkey.

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“…The NDVI index has been applied to many scientific studies worldwide. The long-term NDVI can be used to indicate vegetation trends [12,55,56] and monitor local, regional, and global trends as well as vegetation diversity [57,58]. Bagherzadeh et al confirmed the utility of the NDVI to express the vegetation variability under semiarid climate conditions [12].…”

Section: Introductionmentioning

confidence: 99%

“…Vegetation is simultaneously influenced by the soil characteristics, its moisture and atmospheric parameters [9]. The air temperature and precipitation impacts water balance, and thus the amount of the soil moisture content available for plant growth [10,11], influencing vegetation dynamics [12]. Natural vegetation is changing not only due to intra-annual seasonal dynamics and inter-annual climate variability, but also other factors, such as anthropogenic activities and/or changes in those activities [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The long-term NDVI can be used to indicate vegetation trends [12,55,56] and monitor local, regional, and global trends as well as vegetation diversity [57,58]. Bagherzadeh et al confirmed the utility of the NDVI to express the vegetation variability under semiarid climate conditions [12]. In their study NDVI, LU/LC map, and climate variables (temperature, precipitation) were analyzed at both inter-annual and monthly scales, revealing correlations between NDVI variations and yearly sum of the precipitation with correlation coefficient 0.419 and a very high correlation between monthly NDVI variations and air temperature, reaching 0.769 [12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Anthropogenic Factors Affecting the Vegetation Dynamics in the Arid Middle East

Rousta¹,

Ólafsson²,

Zhang³

et al. 2020

Preprint

5

0

View full text Add to dashboard Cite

The spatiotemporal variability of vegetation in the Middle East was investigated for the period 2001–2019 using the Moderate Resolution Imaging Spectroradiometer (MODIS) 16-day/500 m composites of the Normalized Difference Vegetation Index (NDVI; MOD13A1). The results reveal a strong increase in the NDVI coverage in the Middle East during the study period (R = 0.75, p-value = 0.05). In Egypt, the annual coverage exhibits the strongest positive trend (R = 0.99, p-value = 0.05). In Turkey, both the vegetation coverage and density increased from 2001 to 2019, which can be attributed to the construction of some of the biggest dams in the Middle East, such as the Atatürk and Ilisu dams. Significant increases in the annual coverage and maximum and average NDVI in Saudi Arabia are due to farming in the northern part of the country for which groundwater and desalinated seawater are used. The results of this study suggest that the main factors affecting the vegetation coverage in the Middle East are governmental policies. These policies can have a positive effect on the vegetation coverage in some countries such as Egypt, Saudi Arabia, Qatar, Kuwait, Iran, and Turkey.

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