scholarly journals CLASSIFYING AND MAPPING OF VEGETATED AREA IN AL- BAHA REGION, SAUDI ARABIA USING REMOTE SENSING. II. THE RELATIONSHIP BETWEEN ELEVATION, LAND SURFACE DAY TEMPERATURE, AND VEGETATION DENSITY.

2020 ◽  
pp. 81-84
Author(s):  
Abdullah Saleh Al-Ghamdi

Classifying and mapping of vegetated area in Al- Baha region, Saudi Arabia using remote sensing shows that the medium-high density vegetation is mostly found at the central part of Al-Baha region separating the highlands and the low lands. Results obtained show that only 862.5 km2 (7.7%) Al-Baha region is covered with medium-high density vegetation found mainly at the 6-15km width horizontal central belt (at districts of Al-Mandaq, Al-Baha and south Baljurashi) along high foggy mountainous plateau. Whereas, about 65% of Al-Baha region has very low-none density vegetation mainly occurred extensively at Tihama low plain towards the Red Sea and at the north-eastern desert plain. In addition, study reveals that the highlands of Al-Baha have the most numbers of trees represents the areas of the highest elevations in the region (range between 1940 and 2366 m above sea level. This indicates that there is relationship between this elevation range with medium to high vegetation density. Similarly, the low surface temperatures are mainly located at the central belt across Al-Baha region. When overlaid with medium-high vegetation density zone with the temperature map, it was visually observed that it almost fit with lower temperature zone of less than 15°C. This also indicates that there is relationship between lower temperature with medium-high vegetation density.

PLoS ONE ◽  
2019 ◽  
Vol 14 (11) ◽  
pp. e0221115 ◽  
Author(s):  
Abdulrahman Mohamed Almadini ◽  
Abdalhaleem Abdalla Hassaballa

2008 ◽  
Vol 109 (3-4) ◽  
pp. 313-327 ◽  
Author(s):  
J. Fossati ◽  
G. Pautou ◽  
J. P. Peltier

Author(s):  
J. Yang ◽  
J. Wu ◽  
H. Zhou ◽  
X. Han

In our study, according to the statistical results of standardized precipitation evapotranspiration index (SPEI), we chose two drought events which occurred in the North China during 2001 and in the Southwest China from 2009 to 2010. And two of the Global Land Surface Satellite (GLASS) products had been used to evaluate the impacts of drought on vegetation, including the leaf area index (LAI) and the fraction of absorbed photosynthetically active radiation (FAPAR). The results show that: (1) In the development process of a drought event, the anomaly of remote sensing parameters (LAI and FAPAR) usually falls firstly and then rises as the drought changes from moderate to severe and then to moderate. This indicates that the effects of drought on vegetation remote sensing parameters are closely related to the severity of drought disaster. (2) The response of different vegetation types to the drought disaster is different. Compared with the forests, the response of grasslands to drought disaster is earlier. For example, the duration affected by drought disaster in grassland is longer 1/3 than the forests in the Southwest China. (3) Irrigation is an effective measure to mitigate the effects of drought. Irrigated croplands are less affected by drought than non-irrigated croplands and grasslands. In the North China, the decrease amplitude of irrigated croplands’ remote sensing parameters is about half of non-irrigated croplands’.


Subject Kurdish-Arab tensions in north-east Syria Significance Significant protests between April and June by Arab tribes in north-eastern Syria against Kurdish governance have subsided in north-eastern Syria after Saudi Arabia intervened to encourage de-escalation. However, the underlying causes, including grievances over economic distribution, heavy-handed security methods and a lack of Arab representation in decision-making, have not been resolved. Impacts A deterioration in cooperation between Arab tribes and the SDF may facilitate the operations of IS sleeper cells. The United States and partners will look for further ways to alleviate the concerns of Arab tribes in the area. Ankara and Damascus, which both have designs on the north-east, will play up protests to justify intervention. A mooted Turkish invasion of the border area could radically shift the power dynamic in the region.


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