السبت، 1 يونيو 2013

بحث حول السد الاخضر للسنة الثانية متوسط

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بحث حول السد الأخضر بالانجليزية
السماح بالكتابة بحسب النطق الصوتي
. Definition of Green Dam.
2 Measurement Green Dam
3 climate in Green Dam
4 plants in Green Dam
5 Soil Green Dam
6 Reasons establish Green Dam
7 Results Green Dam
8 interpretation naming Green Dam
9 goals Green Dam
10 Benefits of Green Dam
11 and duty Algerian citizen direction of Green Dam


Introduction:
In the name of God the Merciful and peace and blessings be upon the noblest of God's creation, His Messenger Muhammad, peace be upon him. After:
Commanded by God Almighty to preserve the environment and the ecosystem created in the best stature does not invalidate rights in land and that the reformed system. Must be balanced this system:
* Stability abiotic climatic factors and territorial integrity of the site
* Balance between producers and consumers
* The role of the existing relations between the biotic and abiotic factors
Sometimes upset this balance and be a reason for this: - natural factors: wind, rain ....
- Factors بشربة: where human intervention in the environment:


Of the most important environmental regulations:
* Watery ecosystem.
* Gabi environmental system.
* A desert ecosystem.
Definition: Green Dam is a project launched in 1971 by the late President Houari Boumediene extends from the eastern border to the western border length of 1,500 kilometers. Separation barrier that prevents and oppose the advance of desertification, which is gradually contributes to maintaining the integrity of the Northern Territory private hill.
Dimensions: length of 1,700 kilometers, and extends to a depth of 400 kilometers and is spread on the surface of 3 million hectares.
Climate: Green Dam contribute to the reduction of the advance of the desert, where the temperature is high and is bordered by both the Saharan Atlas mountain range in the south, and is characterized by two seasons:
- Summer heat and winter cold, temperatures ranging between 1.8 ° and in the summer between 33.1 ° and 37.6 °, while rain measurements are weak due to the proximity of the semi-arid region, "a dry climate."
Plant: reflects the nature of the vegetation and climate characteristics and less degree in that land.
And the two types of plants: forestry plants such as:
Wild trees emulsified
Ilex
Atlas pistachio
Pastoral plants: usually composed of allies that exploits for the paper industry, such as:
Allies
Soil: in-depth sometimes does not exceed 60 cm high amount of active limestone, a small amount of basic organic material, a higher degree of acidity of 7.5. These characteristics support the erosion of the earth.
Reasons for the establishment of the Green Dam:
Given Algeria's geographical location and depth of the desert as away far south distance of 2000 km from the sea has been, they subjected most of its neighbors Tunisia and Morocco to the phenomena of erosion and desertification, especially in the current climatic conditions of the ongoing drought with high heat.
Other objectives were designed to this project consisted mainly of afforestation belt longitudinally area 3 million hectares, stretching from the eastern border to the western depth of 20 km and crosses several states most important Djelfa, Batna, Khenchela, gas, eggs, Laghouat, happy, ostrich, and this process of re- ecological balance and protection of existing vegetation, can not be separated natural social goals, as if what is meant is also the elimination of unemployment and isolation that was experienced by the majority of the inhabitants of those areas.
Date and year of the beginning of planting trees:
Immediately after independence, afforestation has been one of the priorities of emergency and for the renewal of forest damage inheritance intensive training during the war of liberation. Work on the project "Green Dam" began only in the early seventies, and specifically in 1974. Project, which connects the western Algerian border to the eastern border with a distance of 1500 kilometers to 20 kilometers wide spread on the surface of 3 million hectares.
Results:
It is difficult to see the outcome and the achievements of all previous interventions but not limited as indicated by statistics from planting or planting fruit trees or incision roads or processing eyes and so there works have continued without interruption and was necessary, but it does not stand out in the final outcome. And to keep the latter limited and not all express what has been achieved during the two decades, and often resulted in sacrifices, sometimes death for young people vulnerable to deadly conditions during the days of extreme heat.
And all the following data focus on the most important achievements sought in the field, although there was little for space Green Dam, and the statistics contained total area treated in which the program interventions have reached 123,000 e and represent 77% of the area programmed, and the proportion of accomplishments vary States concerned except the mandate Bouira and investigated by the whole program by 100%, but this result may return to the small space in addition to the presence of the barn national "Ticjadda" famous cedar trees.
2. Dimensions of the Green Dam. 3. Climate in Green Dam. 4. Green plants in the dam. 5. Soil Green Dam. 6. Reasons for the establishment of the Green Dam. 7. Green Dam results. 8. Interpretation naming Green Dam. 9. Objectives of the Green Dam. 10. Benefits of Green Dam. 11. Algerian citizen duty direction Green Dam 12. A picture of the plane to fill the green. 1. Negative interference: where destructive piece of trees and burn them and so have destroyed the nests of birds have become extinct, mostly so disrupted the food chain ... 2. Positive intervention: where based Green built the dam, which has various benefits on the lives of Algerians ...
Interpretation naming Green Dam:
The Green Dam is the separation, but the barrier is necessary to oppose the advance of desertification and contribute gradually to maintain the integrity of the northern lands private hill where towns and agricultural lands, and thus became the majority of the population in dire need of green spaces larger more necessary than ever for recreation and rest and recover the creative energies .
Based on these facts and this dangerous reality, demonstrated vision and dragged her from changing the methodology and means, and goals, a radical change requirement great efforts, due to the spaces concerned directly and that must take care of it as soon as possible, and so emerged into existence that project الطلائعي which called Green Dam expression of content, particularly the icons that have been identified at the beginning of the seventies and Algeria at a crucial stage.
Green Dam objectives:
Stop the advance of the desert sand carried by the wind south towards the coast, which has become a major threat to agricultural land.
Anti southern winds that remove the surface layer of soil (drift الريحي) and Aqahlha.
Reducing soil erosion.
Create a good layer of soil to fall from organic detritus and dead leaves.
Benefits of a Green Dam:
Stop sand toward the coast and spend every year on thousands of hectares of arable.
Soil regeneration and converted to soil rich Baldbal and analyzed microscopic organisms.
Soil rich Baldbal retention on a large amount of rain, leading to a proliferation of herbal plants that feed cattle.
Protect the soil from wind and water drifts thanks to herbs.
Algeria timber fortification for the establishment of industries in these areas to reduce import and provide employment to a large number of the region's population.
Local climate change thanks to the reduction of the speed of the southern wind.
Algerian citizen duty Green Dam Direction:





2. Constant cleaning. 3. Afforestation regular.
Conclusion:
At the end of this research thank everyone who has helped us to accomplish and enriching this subject is valuable information from which we have contributed to the knowledge of the importance of Green Dam in our daily lives. In order to protect valid layer of soil, leading to the growth of a very large number of plants that benefit some animals and saves some of extinction. Soil and climate are natural factors to reduce the speed of the wind.
Of the most important objectives:
* Source of natural water storage.
* Is the most important supplier of electric power.
* Used to irrigate neighboring plantations.
* Green Dam area Jalbah for tourists from different countries.
* Do not creeping sands of the desert to arable land.


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