Reform and Opening Up，Rapid urban development，Around the world especially China，The process of urbanization is accelerating，People living in cities，I want to get out of the city every weekend，Go to the mountains，Go to the farmland，Breath of fresh air，Smell the flowers，Smell the earth atmosphere，Feeling refreshed。Why is this happening？Let’s analyze the relationship between man and land。

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    The most primitive human need for land is to live in it,In the process of evolution，The ancient apes left the forest and came to live on land，We must first solve the problem of housing，From the previous cave、Half pit kiln、From cave dwellings to today’s high-rise buildings, they have provided humans with shelter from wind and rain,And on this basis, cities gradually developed。With the development of civilization，Primitive harvesting no longer meets human needs for food，Creates demand for agricultural land。Human beings’ continuous adaptation to the land，Deep into the genes。Land is the matrix of urban construction，Modern cities are based on urban planning、Water supply and drainage design、Civil Engineering、Road Design、Constructed with the support of many disciplines and technical systems such as garden design、Extended。 

    二、The degradation of the ecological environment has given rise to the proposal and practice of land engineering 
    dafabet casino mobile appToday’s society，The city is getting bigger、More and more complete functions，It should be the time when humans and the ecological environment are most in harmony，However, the situation is exactly the opposite，We only pay attention to the social attributes or service functions of land in urban construction，No one pays attention to the pollutants in the land or whether it contains heavy metals。 
    Humans have destroyed the ecological environment，Environmental degradation threatens mankind，As a land worker，We are deeply ashamed。The overall urban ecosystem is fragile，Serious air pollution，Body of water、Soil pollution，The problem of garbage siege is prominent。According to statistics，There are more than 600 cities in China，More than two-thirds of cities suffer from water shortages，The cumulative accumulation of garbage exceeds 700 million tons，covering an area of ​​more than 50,000 hectares，More than 200 large and medium-sized cities have been surrounded by garbage，Landfilling and open-air stacking have caused secondary pollution；Congestion、The waterlogging problem is bothering every citizen。This is commonly known as "urban disease"。The main reason for this "disease" is insufficient attention to the mother body of urban construction-the bearing capacity and soil structure of the land，Insufficient understanding of the hazards of poor soil，Especially soil pollution is hidden、Cumulative、Hysteresis and irreversibility，The buffering and solubility of soil can naturally reduce the harm of pollutants within the tolerance range，It will also cover up the problem of soil pollution，Covering human eyes。Once the soil pollution crisis breaks out，To the natural environment、The harm to human life is huge，The consequences are unimaginable。So we are building sponge cities，Long awaited。Take the United States as an example，They are clearing land piece by piece that was defiled by previous generations during the founding construction，It’s worth thinking about。 
    To solve urban development problems, the first priority is to solve the land problem，There is an urgent need to develop the discipline of land engineering。The organic reconstruction of land is the foundation of ecological civilization，All things grow on the earth，It can be said that all construction includes the growth of plants、Human survival and the construction of buildings are inseparable from the earth。 
    Shaanxi Construction Group in many years of engineering practice，Aware of curing this "disease"，We must first solve the land problem，Using organic soil reconstruction, the core technology of land engineering, to fundamentally solve urban soil pollution and other problems，So that the general public can live in health、In a “disease-free” land。In essence, land engineering is the use of engineering means to solve land problems，Put unused land、Degraded land、Renovation of harmful dafabet.com mobileland, etc.、Purification achieves high efficiency、Harmless use，The process of actively coordinating the harmonious development of the relationship between man and earth。The organic reconstruction of soil is through the study of soil at a certain depth，to replace、Technical means such as recombination and reconstruction，Provide necessary conditions for carrying life forms。On this basis，The Land Construction Group is the first international initiative to promote the construction of land engineering disciplines，Guide land engineering practice with a systematic theoretical basis and discipline system，Cultivating land engineering talents，Promote the relationship between man and land to return to an orderly state of harmonious development。In this sense，Land engineering with organic soil reconstruction as the core technology is the foundation of ecological civilization。

 
    3. Research on organic reconstruction of soil has its own system and rich connotations 
    In the process of research，We proposed the scope of organic reconstruction of soil，Found supporting evidence，Formed a series of basic theories such as land engineering practice。But this is just an introduction，We want to gather the strength of everyone，Really forming the discipline of land engineering，Provide theoretical foundation and technical support for urban construction。 
    Organic land reconstruction is the core technology of land consolidation projects，His scientific research encyclopedia、Self-contained system，Covers the following research directions: (1) Research on mechanical requirements。In the organic reconstruction of soil，Requires a clear understanding of the physical properties and engineering classifications of the materials used and studied。In-depth study of the strength of soil materials、Deformation、Permeability and other characteristics，Analyze and calculate the bearing capacity of different materials and foundation projects、Consolidation Compression、Infiltration, etc.；(2) Research on particle demand。Convert the soil、Gravel and other natural materials、Polymer and other synthetic materials are used in organic reconstruction of soil，As the material composition of soil。The physics of soil particles on soil、Chemistry、Mechanical properties play a decisive role。Develop the size and shape of particles in soil、Analysis of the matching of mineral components and particles, their interaction with water and the relative content of gas in the pores，Scientific guidance on soil particle and structural improvement；Scientific guidance on soil particle and structural improvement。The essence of improving soil profile configuration is to use engineering means to build a good profile configuration suitable for crop growth and human habitation，Improve soil environmental quality，Enhancing soil coordination with water、fat、Qi、Thermal Capacity，Improve land dafabet mobile appquality；(4) Research on biochemical requirements。Remove pollutants in soil、Radioactive materials, etc.；Reduce the accumulation of toxic substances；Promote the improvement of the environment；(5) Research on biological nutrition security。The main basis is the survey results and target crops，Based on the nutrient status of the original soil and external soil，Carry out the regulation of soil biological nutrition, etc.。Dutch researchers simulated Martian soil and conducted organic life cultivation experiments，Preliminary results indicate，Pass certain processing measures，Life forms can survive in Martian soil，This explains，It is possible to carry out organic reconstruction of alien soil in the future；(6) Research on water resources utilization。With the development of industrialization，The increase of cities，Rapid growth of population，The demand for water resources is gradually increasing，The water crisis is becoming increasingly prominent，Therefore, the implementation of land projects is inseparable from the construction of supporting projects for water resource utilization，Inseparable from carrying out water resource utilization research，Maximize the use of water resources；(7) Research on ecological environment design。Including in-depth research on the construction of ecological security pattern of land engineering、Research on ecological reconstruction and biodiversity protection of land engineering design、Research on the human settlement environment construction of land engineering and research on the impact of land engineering on the ecological environment, etc.。 
    Form the optimal decision-making system，We apply it to engineering construction，Form the optimal decision-making system，Quickly solve problems in land engineering，Improve data collection capabilities in land engineering disciplines、Element integration ability、Computing simulation capabilities、Decision support ability、Ability to demonstrate results。In many years of engineering practice，Especially under the guidance of the national big data strategy，The land and resources system and the vast number of land engineering companies have accumulated a large amount of information，The “one map” database of land and resources has basically been formed nationwide，To improve land resources management and service levels、Played an important role in promoting the development of land engineering。 
    （Han Jichang  The author is the general manager of Shaanxi Land Engineering Construction Group、Researcher)