| Farmland resource system is an entire system which consists mainly of paddy field, dry land and vegetable field, etc. It is the material foundation and the wealth source for the survival and development of human beings, moreover, an important guarantee for maintaining the national food security, social stability and sustainable development of ecological environment. In certain area, whether the farmland resource system and the relevant subsystems of land resource system, socioeconomic system and eco-environment system are synergic, ordered and sustainable will directly determine and affect the existence, development and continuation of human society. In recent years, with the constant growth of population and the increasing acceleration of social and economic development and urbanization, the urban area of Chengdu Plain is expanding continuously, the farmland resource is occupied massively, and the harmonious and ordered spatial pattern of villages and towns is severely affected. Meanwhile, since the demand of food and agricultural products is rigid and the agricultural production has to depend on intensive farming and a large amount of chemical fertilizer and pesticide for output guaranty, a series of resource and environmental problems such as soil degradation and environmental pollution, etc. are caused. The above-mentioned problems affect the synergic and ordered operation relation between the farmland resource system of Chengdu Plain and relevant subsystems of the three major systems to a certain extent and seriously restrict the sound and sustainable development of the farmland resource system.As a result, this thesis chooses the farmland resource system as the research object. Based on its attributive characters and multi-disciplinary theories such as systematology and synergetics, the farmland resource system is regarded as an organic integrity in land resource system, socioeconomic system and eco-environment system. The methods of combining qualitative analysis with quantitative analysis, criterion research with demonstration research, as well as theoretical analysis with scientific experiment are adopted to thoroughly analyze the synergic relation between the farmland resource system and relevant subsystems of the three major systems, the mechanism and external manifestation of its synergy. The analysis of order parameter and the computation of synergy model give a response to the major problems: whether the farmland resource system of Chengdu Plain and relevant subsystems of the three major systems are synergic; what is the state and degree of synergy and the key factors which cause the asynergy of the system. Based on the above analysis and computation, the major viewpoint of "synergic regulation" is developed. The integrated solution of the synergic regulation of the farmland resource system in the researched area which centers on five major regulation modes is made accordingly. Then the basic framework of relatively complete analysis and regulation on the synergy between the farmland resource system of Chengdu Plain and relevant subsystems of the three major systems begins to take shape to provide a new line of analysis for farmland resources protection and sustainable utilization research.Through the above analysis, the thesis gives the following main research conclusions:1. Based on relevant theoretical foundation, the thesis has a compressive and systematic study on the connotation, essential characteristics and function performance of the farmland resource system. It argues that the farmland resource system is a subsystem formed by the interrelation, interaction, interlacing and interconnection of relevant subsystems of land resource system, socioeconomic system and eco-environment system in certain area. The essence of its synergy is the synergic and ordered relation between the farmland resource system and relevant subsystems of the three major systems (such as the population subsystem, environment subsystem and industry subsystem, etc.). The external manifestation of its synergy is often characterized by the three major attributes of the quantity, quality and spatial distribution of farmland resource systems. Among the three major attributes, the quantity largely reflects whether the amount and structure of resources is rational; the quality represents the quality and environment characteristics of the resources; and the spatial distribution marks whether the space distribution of resources is rational and in line with the social and economic development, industrial layout and landscape optimization..2. Relevant analytical methods of the "degree of order" and the "order parameter" are introduced to analyze the synergy between the farmland resource system of Chengdu Plain and the relevant subsystems of land resource system, socioeconomic system and eco-environment system. Through the thorough analysis in time and spatial dimension, the synergic and ordered features are reflected in the three major attributes of the quantity, quality and spatial distribution of the system.(1) The synergy of quantity attribute of the farmland resource system is set as the "harmony of man-environment relationship" and the controlled order parameter is reduced to "per capita arable land", the "annual land decrement rate" and the "rate of farmland to land" etc. to conduct system research and measurement. The findings indicate that the ordered state of quantity attribute of the farmland resource system of Chengdu Plain changed from "relatively ordered to basically ordered and to relatively disordered" in the period from 2002 to 2008. The study shows that the quantity attribute developed in a trend of asynergy and there were obvious area differences. The essence of the quantity attribute reflects the increasingly severe man-environment relationship and proportional relationship visible with the interrelation and interconnection between the farmland resource system and the population subsystem of the socioeconomic system as well as relevant subsystems of the land resource system.(2) The synergy of quality attribute of the farmland resource system is set as the "sustainable utilization of resource" and the controlled order parameter is reduced to "soil fertility index", "output value from per unit area of farmland" and "soil pollution index", etc. to conduct system research and measurement. The findings indicate that the degree of order of the system quality attribute declined constantly, with the annual decrement rate of 16.42%. The study shows that the quality attribute of the system developed in a trend of asynergy sharply and there were obvious spatial differences. The essence of the quantity attribute reveals the connection and coupling between the farmland resource system and relevant subsystems of socioeconomic system and eco-environment system, and reflects the influence of social and economic development on farmland resource utilization effect, productive skill and environmental quality under the condition of the existing productivity level.(3) The synergy of spatial distribution attribute of the farmland resource system is set as "rational spatial layout" and the controlled order parameter is reduced to "Per Capita GDP", the "rate of first industry output value to regional GNP", the "rate of labor force in first industry to the total labor force", "rural per capita net income", "SHDI" and "SHEI", etc. to conduct system research and measurement. The findings indicate that, in the past six years, the degree of order of the spatial distribution attribute of the system continued to rise and the spatial distribution attribute developed in a trend of synergy. The study shows that the utilization of farmland resource in the researched area is in line with the speed and level of social and economic development. However, the asynergy between the farmland resource system and the industrial structure and landscape pattern in the researched area must be paid attention.(4) The order parameter of synergy between the entire farmland resource system and the subsystems of land resource system, socioeconomic system and eco-environment system is set as "synergic development" and the controlled order parameter is reduced to "harmony of man-environment relationship", "resource sustainable utilization" and "rational spatial distribution" to conduct system research and measurement. The findings indicate that the degree of order of the farmland resource system in the researched area declined in general and the farmland resource system developed in a trend of asynergy and there were obvious fluctuations in various areas in the period from 2002 to 2008 under the common influence of the degree of order of the three major attributes of the system.3. The three major attributes and the entire degree of order of the system is judged from the "contribution" of the controlled order parameter of the three major attributes of the system on the degree of order of the system. Based on this, the variation characteristics reflected by the change of degree of order with the time are utilized to analyze the degree of synergy of the system and build the synergy evaluation model. Through the analysis and computation of the model, the findings indicate that the degree of synergy between the farmland resource system of Chengdu Plain and the relevant subsystems of land resource system, socioeconomic system and eco-environment system was a negative value ranging between -0.1 and -0.01 in the period from 2003 to 2008. Therefore the entire system was in a state of asynergy. The variation is divided into three phases in time dimension:the synergy degree of farmland resource system continued to rise and the system developed from the state of asynergy to the state of synergy in the period from 2003 to 2005; the synergy degree declined in the period from 2005 to 2007; and the synergy degree increased slightly in the period from 2007 to 2008. Meanwhile, the synergy degree of farmland resource system showed obvious spatial differences. The above-mentioned characteristics indicate that the farmland resource system of Chengdu Plain and the relevant subsystems of land resource system, socioeconomic system and eco-environment system in regional area are in an asynergic and inharmonious state to a certain extent. Therefore, it is essential and necessary to conduct relevant research on the synergic regulation of the farmland resource system.4. Through a comprehensive analysis on the synergy characteristics and main existing problems of the farmland resource system of Chengdu Plain at the present stage, the key factors that cause asynergy of the farmland resource system of Chengdu Plain are found out as follows:(1) acceleration of economic development, industrialization and urbanization; (2) constant growth of population; (3) benefit gambling and asynergy between plural subjects of the farmland resource system; (4) land degradation; (5) worsening land pollution; (6) lack of the instruction of synergic regulation idea and method for the farmland resource spatial distribution; (7) lack of effective interface between the land utilization overall plan, town planning, industrial development plan; (8) lack of overall planning for construction land in town and countries and low resource utilization ratio.5. Combining the overall analysis of the synergy characteristics of the farmland resource system in the researched area, the viewpoint of "synergic regulation" is developed to search for the existing problems and key factors. Efforts are made to adopt multiple effective regulation methods of management, technology, economy and laws, etc., and integrate the mechanism, methods, technology and mode effectively. The integrated solution of synergic regulation of the farmland resource system in the researched area, including four categories (thirteen items), which centers on "the synergic regulation mode based on farmland resource of industrial structure plan and spatial distribution optimization, the synergic regulation management mode based on the benefit of interrelated subjects of farmland resource system, the synergic regulation technology mode based on farmland quality protection and key technology improvement, the synergic regulation mode based on the combination of multi-platform farmland resource information monitoring technology integration and digital dynamic monitoring system, and the synergic regulation management mode based on farmland resource of land development and consolidation technology " begins to take shape. The main problems of asynergy that affect the three key attributes of quantity, quality and spatial distribution of the farmland resource system are effectively resolved. Some of the regulation modes have been put into practice and had a marked effect.The characteristics and innovation of this paper:(1) Innovation in research thinking. This paper has basically formed a relatively thorough analysis of fundamental thinking, research structure and research method on the synergy of cultivated land resource system. What's more, it offers a new way of thinking in related cultivated land resource system research.(2) Innovation in research perspective. Traditional research on cultivated land resource system mainly adopted " part to the whole" strategy and made solution directly according to the existing problems. This paper adopted systematology's ideas to make research on the synergy of cultivated land resource system and upheld systematicness and globality. This paper carried out analysis by using the strategy of "the whole to part" on the essential features of research objects and reached solution by analyzing the relationship between internal and external factors, part and the whole, and by explaining synergy mechanism and building mathematical model.(3) Interconnection and integrated innovation of multi-disciplinary research method. According to the features of the research object:cultivated land resource system. This paper attached great importance to the comprehensive adoption and interconnection of multi-disciplinary research method and paid attention to the combination of different methods such as, the combination of social science and natural science, normative research and empirical study, quantitative analysis with qualitative analysis. Meanwhile, due to the demand of research, this research introduced many natural science research methods such as GIS technology and analysis measurement technology (soil agrochemistry analysis, environmental pollution analysis) to the research of cultivated land resource system management so as to realize integrated innovation by combing different research methods.
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