مظاهر التصحر وتاثيرها على الواقع الزراعي في محافظة ذي قار == The manifestations of desertification and its effect on the agriculturl reality in Dhi Qar
Author name:
حیدر عبد المحسن كاظم العسكري
Supervisor name:
عبد الرزاق خیون خضیر ال محیمید
General topic:
Geography
Specific topic:
Natural Geography
Degree:
Master
University:
University of Thi-Qar - College Of Literature - Department Of Geography
Language:
Arabic
University location:
Dhi Qar
First pages:
10T1695 - p.pdf
Abstract:
The aim of this thesis is to detect the manifestations of desertification and their effects on the agricultural situation in Dhi - Qar governorate and determine the regions of their spatial distribution and classifications. This study has explained the concept, degrees, and manifestations of desertification and the agricultural status at the chosen area. It has been observed that a wide area of Dhi - Qar governorate is suffered from the problem of desertification which has harmed the agricultural lands and reduced the agricultural production.This study has also showed the most important natural factors that cause the generation of manifestations of desertification in the selected region such as the geological structure, the surface, the features of climate, the climate phenomena, the climate balancing properties, the natural plant, the water resource characterisations, and the soil. It has been noticed that the aforementioned impacts are directly or indirectly participated and increased the problem of desertification in the study region. Moreover, it has been showed that the selected region is highly suffered from low water which is estimated by 3497.3 mm during the year including the raining season. This has reflected on the water resource characterisations and decreased both the overground and underground resources.This thesis has addressed the most important human parameters that are participated in appearing the desertification such as the wrong procedures in agriculture, population growth, infrastructure increasing, overgrazing …etc. Consequently, in this study, it has been observed that the farmer has no taught, low knowledge with his water requirements for the agricultural crops and excess in using an irrigation water in the face of low number of stream of water. As a result, the soil has becomeunsuitable for agriculture which makes it uncultivated area. In addition, the population growth which is approximately 2.9% and the infrastructure increasing have negative role on the suitable areas for agriculture and their productions which cause deterioration of large areas that leads for desertification. Moreover, the overgrazing has increased the problem of desertification through suffering the natural pastures to damage their natural plant that is utilised to as protection cover.In this study, it has been given the impacts that result form the manifestations of desertification and their spatial distribution in the chosen area such as soil salinity. It has been noted that all types of the soils are suffered from various degrees of the salinity. This refers to employing or ignoring the soil as well as the incorrect using of the water for agriculture and the level of groundwater and its approaching from the ground. Furthermore, the impact of salinity on using special types of crops that are resisted to the high change in salinity rather than the crops that are much tolerated to the salinity. Moreover, the effects of wind erosion and their spatial distributions in the studied area have been provided. This study has showed the wind erosion and its affect such as the phenomena of dusty weather has great impact on the properties of the soil and its production. This study has also found out by using the applied equation (F.A.O) that the annual summation of climate ability of wind erosion is equal to (276.29) which means the chosen region is located in very harsh erosion. This study has also explained there are locally and seasonally differences in the dust quantities that are transferred by the wind from the surface layer of the soil of the study region which is differentiated according to the climate ability of this region. This work has also performed the effects that are resulted from the moving of the sand dunes and their local distribution. It has been observed that converting a huge area of farmlands and pastures in Al - Btahaa, Al - Fajar,Al - Nasser, and Kalaat Sukkar to lands desertified because the moving of the sand dunes. Accordingly, the total land area of the study area that is faced the moving of the sand dunes is estimated by 162000 acres.This study has provided the important methods that can be followed to treat the problem of desertification. For instance, the important technical and scientific approaches as well as the social and economic ways that can be used to overcome or limit the impacts of desertification on the farmlands in the study region.
