التوظيف التكاملي للتقنيات الجيومكانية والكربون المشع في دراسة التغيرات الجيومورفولوجية والغطاء النباتي بحوض وادي الفويلق بمنطقة القصيم

الملخص EN

Integration of spatial change techniques and radiocarbon dating in the study of geomorphology and vegetation cover in the Basin of Wadi Al Fuwaylig, al-Qassim area closed desert basins were a haven for social stability in the Saudi desert.

It has exploited by man since ancient times; centering around streams wadis and make a craft agriculture in the fertile floodplains.

Basin of al-Fuwaylig is one of many closed desert basins which witnessed a noticeable change in the last few years, especially after the development in aspects of life in Saudi Arabia.

This research used the radiocarbon method, Remote sensing, and geographic information system techniques.

It proposes to study and track the spatial variability of different land cover types in Wadi Al-Fuwaylig basin during the ancient past time (Holocene) until the current time.

It helped to monitor many of various environmental changes.

Results of the study led to characterize the period of moisture over the basin during (9459-12270cal BP) of the Holocene and as consequences of that were a density of the vegetation increased and aqueous flows accompanied with torrential rains.

Wadi Al Fuwaylig is taking its current form by the drought season that might be in the of mid-Holocene period.

On the other side in the present time, this research monitored changing and manifest increasing of fluvial sand, sand dunes, and sand sheets during the period between 2000 and 2015.

All these changes were due to the role of the wind and growing of both the urban area and vegetation cover.

Moreover, the area of the agricultural lands increased remarkably, and that clarify the needs of the population to different types of farm crops such as barley, Wheat, and Rhodes grass.

There was a shrinking prominent in the natural vegetation area, which limited on small parts of the basin of Wadi al-Fuwaylig, specifically near to the stream of the wadi and between the agricultural lands.

sabkhas did not haunt any apparent change due to concentration in ancient surface schizophrenia area, and its result was infiltration of groundwater, and perhaps there is a little impact of irrigated agricultural at the upper and the middle of the basin.