Land desertification, what is land desertification

Natural causes: drought, loose surface material, strong winds.

Anthropogenic causes: the pressure of population explosion on the ecological environment; Improper human activities, excessive and irrational use of land resources, water resources.

Result: Land degradation and loss of soil fertility form desertified landscapes. It is manifested as land desertification, stony desertification, and secondary salinization.

Countermeasures:1Rational use and utilization of water resources.

2.Biological and engineering measures are used to build a protection system.

3.Regulate the relationship between agriculture, forestry and pastoral land.

4.Comprehensive measures should be taken to solve the energy problem in agricultural and pastoral areas in multiple ways.

5.Control population growth.

Reasons:1Human deforestation, etc. 2Global warming and low precipitation.

Consequences: desertification of the land, drought, imbalance of ecosystems. The population carrying capacity of the land is decreasing.

Measures:1Stop destroying vegetation and plant trees. 2.Economic and social development and the environment are unified.

Summary. Hello dear, I'm glad to answer for you, here according to your question, the answer to you is: land desertification, also known as land desertification.

It refers to the phenomenon that in the arid and semi-arid grassland areas at the edge of the desert, due to the scarcity of rainfall, the large amount of evaporation, the arid and windy climate, the land loses vegetation, and the soil is gradually eroded by the wind and gradually evolves into a desert area. Desertification of land has deprived the land of its biological capacity, and sand has encroached on farmland, grassland and woodland, threatening transportation and villages and towns. It is one of the global environmental problems.

Hello dear dear, I am happy to answer for you, the difference here is according to your question, the answer to you is: land desertification refers to Qing rent, also known as land desertification. It refers to the phenomenon that in the arid and semi-arid grassland areas at the edge of the desert, due to the scarcity of rainfall, the large amount of evaporation, the arid and windy climate, the land loses vegetation, and the soil is gradually eroded by the wind and gradually evolves into a desert area.

Desertification of land has deprived the land of its biological capacity, and sand has encroached on farmland, grassland and woodland, threatening transportation and villages and towns. It is one of the global environmental problems.

To add to you: soil desertification refers to the phenomenon that the land is affected by climate change, human activities, environmental pollution, etc., resulting in soil destruction, plant death, water resource reduction, and land being covered by layers of sand and dust and plant death, forming a desertification phenomenon. Desertification will change land functions, affect the original agriculture, forestry, animal husbandry and other activities, and have a more significant impact on regional economic development and ecological environment.

The main causes of desertification are: (1) irrational agricultural activities, such as over-tillage and overgrazing, will destroy soil structure and make soil drought more serious; (2) Natural factors, such as arid climate, red tides, sandstorms, etc., will damage the soil structure and make the soil more prone to desertification; (3) Human factors, such as deforestation and overexploitation, will increase soil exposure and exacerbate land desertification. Sleepy.

With the reduction of forest area, the degradation of grasslands, and the situation of desertification of apprentices is becoming more and more serious, why is there desertification of land? I'll take you to see it next. Causes of desertification:

Including natural causes and man-made causes***Analysis of Northwest China as an example***1***Natural Causes Basic Conditions - Climate Drought and Lack of Rainfall The climate is arid, the surface water is poor, the rivers are underdeveloped, and the flowing water is weak, while the physical weathering and wind are significant, so a large area of Gobi and desert is formed. Material conditions - loose ground, sandy sediments Due to the arid climate, sparse vegetation and poor soil development, there are many loose sandy sediments on the flat land. Dynamic conditions – the high number of windy days and their concentration in the dry seasons of winter and spring create favorable conditions for wind-blown sand activity.

Climate anomalies can cause imbalances in fragile ecological environments, which are the main reasons for the acceleration of desertification processes. *2*** Human causes: Overgrazing; excessive woodpicking; Over-reclamation.

Desertification control measures:1. Rational use of water resources In agricultural areas, it is mainly to improve farming and irrigation technology, promote water-saving agriculture, and avoid soil salinization; In pastoral grasslands, reduce the number of wells to avoid a large disorderly growth of livestock; In arid inland areas, it is necessary to rationally allocate water resources in the upper, middle and lower reaches of rivers, and consider the development of the upper and middle reaches of the rivers as well as the protection of the ecological environment in the lower reaches. *2*** Biological and engineering measures are used to construct a protection system Oasis areas in arid areas Sand closure and grass cultivation should be carried out in the desert edge area on the periphery of the oasis; In the front area of the oasis, create a sand-proof forest belt combining trees and shrubs, actively protect, restore and develop natural shrub and grass vegetation, and establish a farmland shelterbelt network in the oasis to form a multi-layer protection system.

In areas lacking water sources, use firewood, grass, tree branches and other materials to set up sand barriers in quicksand areas to intercept sand sources, solidify quicksand, and block the forward movement of sand dunes. *3*** Regulate the relationship between agricultural and forest land - suitable forests for forests, suitable for grazing and pasture Existing forest land should be used as part of shelterbelts, and no longer deforestation can be used for land. The shrub and grassland area between the wasteland and the oasis at the edge of the oasis cannot be reclaimed blindly, and is mainly used for planting trees and grasses and developing forestry and animal husbandry.

In places where desertification has already occurred, it is also necessary to return farmland to forests and pastures. *4*** Adopt comprehensive measures to solve the energy problem in agricultural and pastoral areas in multiple ways Ways to solve the energy problem of farmers and herdsmen: such as building charcoal forests, building biogas digesters, and promoting provincial firewood stoves.

5. Controlling population growth Controlling the rapid development of the population, improving the quality of the population, and establishing an ecosystem for the coordinated development of population, resources, and environment are of great significance to the prevention and control of desertification.

Question 1: What are the main causes of land desertification Natural factors.

The formation of land desertification is a complex process, which is the result of the interaction between unreasonable human economic activities and fragile ecological environment. Natural geographical conditions and climate variation have created conditions for the formation and development of desertification, but the process is slow, and human activities have stimulated and accelerated the process of desertification, which has become the main cause of desertification. Abnormal climatic conditions, especially severe drought conditions, can easily lead to the degradation of vegetation and the acceleration of wind erosion, causing desertification.

Arid climatic conditions determine the vulnerability of the local ecological environment to a large extent, so drought itself contains the potential threat of desertification. Climatic anomalies can cause imbalance in fragile ecological environments and are the main natural factors leading to desertification. When the climate dries, desertification develops; When the climate becomes wetter, desertification is reversed. Global warming, increasing drought in the northern hemisphere, and the trend of semi-aridization have all contributed to the intensification of desertification.

Climatic factors The updraft in the equatorial region flows in the direction of the poles at high altitude, due to the influence of the earth's rotational deflection force, near 30 ° north and south latitudes, most of the air no longer advances, but accumulates at high altitude, and radiates cooling and sinks, and the near-surface atmosphere maintains high pressure all year round, which is called the "subtropical high pressure belt" in meteorologyExcept for the monsoon climate zone on the east coast of Eurasia, this area has a dry climate and few clouds and rains, and has become the main desert distribution area.

Unreasonable production activities of human beings.

Population growth and economic development have put too much pressure on the land, and over-cultivation, overgrazing, deforestation and irrational use of water resources have led to serious degradation of land, destruction of forests, gradual drying of the climate, and eventually desertification.

Problem 2: Main causes of desertification of land 1The main reason is that human irrational land use activities have a serious impact on land and ecosystems, and the intensification of global climate change is also one of the main reasons.

2.Natural factors mainly refer to abnormal climatic conditions, especially severe drought conditions, which lead to the degradation of vegetation and the acceleration of wind erosion, resulting in desertification. Human factors mainly refer to overgrazing, indiscriminate logging, grassland reclamation and continuous farming, etc., resulting in vegetation destruction and accelerated wind or rain erosion on the surface.

3.Worldwide, overgrazing and inappropriate dryland agriculture are the main causes of desertification in arid and semi-arid areas. Similarly, poor water management in arid and semi-arid areas, resulting in the salinization of large areas of land, is a serious problem.

From the perspective of the impact of human activities on land degradation in the Asia-Pacific region, vegetation destruction accounts for 37%, overgrazing accounts for 33%, unsustainable agricultural cultivation accounts for 25%, and infrastructure construction is overexploited.

Question 3: What are the main causes of land desertification Natural causes: arid climate, mostly loose sandy sediments on flat land, many windy days and concentrated in the dry season of winter and spring.

Anthropogenic causes: over-mining, over-reclamation, overgrazing, improper use of water resources, etc.

Measures to solve land desertification: 1. Protect existing vegetation and strengthen forest and grass construction. While strengthening governance, we should effectively solve the problems of population, livestock, and stoves, and strictly protect the forest and grass vegetation in sandy areas.

Through afforestation and the rational allocation of trees, shrubs and grasses, we should build a multi-species, multi-species, and multi-level three-dimensional protection system to expand the proportion of forests and grasses. While doing a good job in artificial governance, we should give full play to the self-repair function of the ecosystem, increase the ban and protection, and promote the natural restoration of the ecology. Because of the characteristics of fast speed, less labor, low cost and good effect, aerial seeding is of greater significance to the restoration of vegetation in vast and sparsely populated, inconvenient transportation, remote barren sand and barren mountain areas.

2. Carry out a lasting ecological revolution in desertification areas to accelerate the reversal of the desertification process. The key to burying mountains is to rationally allocate water resources and ensure ecological water use. For example, the irrational water resources allocation system is the direct cause of the shortening of rivers, the shrinkage or even drying up of lakes, the decline of groundwater level, and the desertification of land in northwest China.

3. What are the measures to strictly implement the family planning policy, control the excessive growth of the population, and continuously improve the quality of the population. Through carrying out publicity and education on environmental awareness, the ideological level of the whole nation will be raised. Care for and care for the environment, consciously participate in the transformation and construction of the environment, and form the fashion of the whole society.

At the same time, the state should systematically carry out ecological migration in areas where local desertification is very serious, grasslands and cultivated land are almost completely abandoned, and the harsh natural environment is no longer suitable for human survival. 4. Reverse the backward situation of relying on the sky to raise livestock, and reduce the damage to the pasture. It is necessary to implement the grassland contract responsibility system, set reasonable rules and regulations for carrying livestock, vigorously promote fencing and rotational grazing, vigorously develop artificial grassland or artificially improved grassland, and distribute houses to raise livestock.

Speed up the cultivation of excellent livestock breeds and optimize the structure of livestock breeds. 5. Speed up the adjustment of the industrial structure, rationally allocate the proportion of agriculture, forestry, animal husbandry, and sideline industries in accordance with market requirements, actively develop the breeding and processing industries, divert the surplus labor force in the rural areas, and reduce the pressure of the population on land. It can also make use of the desertification area contains a variety of unique resources, such as light and heat, natural landscape, culture and folk customs, surplus labor and other resource advantages to develop tourism, exploration, scientific research industry, etc.

6. Optimize the energy structure of agricultural and pastoral areas, and vigorously advocate and encourage the people to use unconventional energy, such as wind energy, solar energy, biogas and other energy sources, so as to reduce the damage to forests, grasslands and other resources. 7. While doing a good job in international implementation, strengthen international exchanges and cooperation in the prevention and control of desertification, and strive for funds and foreign aid. Legal basis:

Article 3 of the Regulations on the Implementation of the Soil and Water Conservation Law of the People's Republic of China The local people in the soil erosion prevention and control area shall implement the responsibility system for soil erosion prevention and control objectives. Fourth local people's soil and water conservation institutions established according to the actual local conditions, can exercise the law on soil and water conservation and the rules and regulations of the competent administrative departments of water and soil conservation.

Categories: Science & Engineering.

Problem description: Summarize language, coherent.

Analysis: First of all, the sand dunes can be fixed by laying grass squares and burying sand barriers to prevent further expansion of the desert.

Secondly, the intensive management of land should be promoted, overgrazing is strictly prohibited, rotational tillage and fallow are advocated, and soil fertility is maintained.

Thirdly, optimize the planting structure, implement precision irrigation if possible, and learn advanced technologies such as Israel.

In addition, people in land degradation and desertification areas should change their consciousness and should have a certain amount of labor output to alleviate the situation of relying on the land for food; Such areas should also adjust the industrial structure, vigorously develop some industries with high economic added value other than agriculture, and grain can be solved in the form of purchasing products from other places, save precious water resources, better control desertification, and control the development of desertification.