| Land use transition refers to the change of land use morphology in a country or region in the process of socio-economic development.Since the 1990 s,with the increasing attention paid to the sustainable use of land resources and the formation of land change science,the research on land use transition,which focused on how to realize the scientific and effective management of land resources and promote the sustainable development of regional economy and society,has become the frontier topic and important field of land change science.However,there are still some shortages in the current research,such as the lack of attention to the transition of recessive morphology of land use,the separation of the relationship between land use transition and socio-economic transition,and the unclear of the comprehensive mechanism of policy institutional factors on land use transition.The relevant research needs to be further deepened.At present,China is undergoing socio-economic transition and profound ecological change,and the spatial governance is continuously deepening and improving.However,in the process of territory utilization,some prominent problems,such as tight constraints on resources and environment,serious environmental pollution and ecosystem degradation,are still exists.The above background puts forward higher requirements for the study of land use transition in China.The underdeveloped areas in China are typical areas with various policy functions such as land resource management policy,urbanization policy,eco-environmental protection policy,and so on.It is of great significance to explore the mechanism of land use transition in underdeveloped areas of China in order to solve the outstanding problems in the process of land use and realize the sustainable use of land and resources.Based on the above aspects,this paper systematically summarizes the relevant research on land use transition at home and abroad,and puts forward the model of regional land use transition under the guidance of policies,and constructs the theoretical framework of regional land use transition under the guidance of policies.Taking Three Provinces of Northeast China as an example,this paper systematically analyzes the connotation,process and mechanism of regional land use transition under the guidance of policies,and puts forward targeted optimization measures of land use transition from the perspective of policy system.This paper provides an analytical paradigm and path for the comprehensive interpretation and research of the regional land use transition,further provides basic theoretical support for the scientific simulation and prediction of the evolution of regional land use,and it can also provide direction reference and decision-making basis for the new round of Northeast Revitalization strategic policy making.The paper was divided into eight chapters,the main ideas and contents are as follows:1.For the undeveloped areas of China,which is represented by Three Provinces of Northeast China,there is a new model of land use transition,that is regional land use transition under the guidance of policies.Its basic characteristics are complex,phased,systematic,tendency and instability.The mechanism of regional land use transition under the guidance of policies should be systematically analyzed from land scarcity and land intensification,regional functional orientation,economic modernization and urbanization,marketization and globalization,population growth and population migration.2.Based on the process of urbanization,population change,economic growth,industry and employment structure evolution,the socio-economic development of Three Provinces of Northeast China from 1995 to 2015 can be divided into three stages: the stage of primary product production,the stagnation of urbanization and population growth(1995-2005);the transition stage of economic development and population growth(2005-2010);the industrialization stage,the economic and population recession period(2010-2015).There was a transition process in the socio-economic development of Three Provinces of Northeast China.With the process of socio-economic transition,the land use transition took place in Three Provinces of Northeast China.3.The land use transition in Three Provinces of Northeast China was a comprehensive process including the transition of dominant morphology and recessive morphology.The main characteristics of land use dominant morphology transition are as follows: the scale of arable land keeps increasing,but the growth rate changed from falls to rises,and the source of arable land growth changed from woodland and grassland to unused land.The internal structure of arable land has been adjusted continuously,and the expansion of arable land tends to be concentrated in Sanjiang Plain.The woodland,grassland and water area showed a turning change of "decline,stabilization and re-decline",the large scale conversion of woodland and grassland to arable land led to the decline of regional ecological land.The continuous expansion of conversion scale from unused land to arable land leads to the rapid decline of the scale of unused land.The decrease of unused land tends to occurred in the Sanjiang plain and its scope gradually expands.The continuous expansion of the conversion scale from arable land to construction land accelerated the growth of construction land area in Three Provinces of Northeast China.The transformation of rural residential land from growth to decline and the continuous high-speed growth of non-agricultural construction land resulted in the structural adjustment process of regional construction land.The growth of construction land presents the transfer path of "central city-urban belt and coastal area-core area of Ha-Chang Urban Agglomeration".4.The core of the recessive morphology transition of land use in Three Provinces of Northeast China lies in the function transition.The land use function in Three Provinces of Northeast China can be divided into three core functions: development support function,development power function and ecological basic function.Under the development support function,there are two sub functions: agricultural production function and rural stability function.The development power function includes two sub functions: economic development function and social development function.The transition of the recessive morphology of land use in Three Provinces of Northeast China was mainly manifested as follows: in the aspect of the evolution of the functional structure,the land use function in Three Provinces of Northeast China was dominated by the development power function,and there was an evolution process of "diversified characteristics,singleness and diversification".In terms of temporal and spatial evolution of functional level,the development support function of land use in Northeast China was in the process of "slow degradation,recovery and upgrading,upgrading and acceleration",and its spatial characteristics change from "high in the west and low in the east" to "high in the north and low in the south".The development power function of land use in Three Provinces of Northeast China shows a dramatic change process of "slow degradation,high-speed upgrading and slow upgrading",and the function polarization between units was increasingly obvious.The ecological basic function of regional land has been degraded continuously,which is a process of "slow degradation-tend to stability-accelerate degradation",and the spatial feature was "high in the east and low in the west".In terms of the coordination relationship between functions,the coordination relationship between the agricultural production function and rural stability function was on the verge of maladjustment as a whole,the coordination changed from falls to rises and the spatial characteristics of "high in the north and low in the south" are increasingly prominent.The relationship between economic development function and social development function of land use in Three Provinces of Northeast China was seriously unbalanced,but in the process of transformation from degradation to improvement.5.For the underdeveloped areas represented by Three Provinces of Northeast China,which are obviously affected by multiple policies and have low degree of marketization,its land use transition is the kind of land use transition under the guidance of policies,which is the result of the comprehensive effect of a telecoupling system.In the telecoupling system,the external land-use system and the global system constitute the sending system.The regional land-use system is the receiving system.The sending system takes the capital flow,information flow,policy flow and material flow as the main carriers,and takes the globalization,remote connection and macro overall planning as the main forms to act on the regional land-use system.Under the function of the sending system,the direct and indirect causes interact with each other in the regional land use system,forming two major paths leading the regional land use transition in Three Provinces of Northeast China,which are the socio-ecological feedback path under the guidance of policies and the socio-economic change path under the influence of policies.The socio-ecological feedback path under the guidance of policies controls the supply of different land use classes,guides regional and individual land use behaviors,constrains and forms the basic framework of regional land use patterns,determines the direction of regional land use transition.The socio-economic change path under the influence of policies controls the demand of different land use classes,which determines the speed and intensity of regional land use transition.The land use transition in Three Provinces of Northeast China is the result of the coupling and antagonism between the socio-ecological feedback path under the guidance of policies as well as the socio-economic change path under the influence of policies.The regional exogenous process represented by market environment and globalization development is the key process of the interaction of the two paths.6.In the process of land use transition in Three Provinces of Northeast China,there are a series of outstanding problems,such as extensive use of construction land,the imbalance between economic development function and social development function of land use and so on.Besides,the land use in Three Provinces of Northeast China also facing the "new challenge" of worsening land spatial conflict and functional conflict.Based on these,this paper puts forward the direct objective,control objective and final objective on the optimization of the land use transition in Three Provinces of Northeast China.Further,we put forward targeted suggestions from the aspects of spatial governances,land management policy optimization and system innovation,urbanization policy design,agriculture and rural development policy optimization,so as to promote the orderly regional land use transition with systematic policy design. |
PDF Full Text Request