Research On The System Entropy Based Cultivated Land Use System Security Assessment In Harbin

With the accelerating process of economic globalization, climate change、population growth、 environmental pollution、energy shortages and many other global issues have become more abrupt, land use system change and security issues as one of the core of the world’s land program (GLP) has become the focus of global attention. Land use system security is the most powerful protection of a national food security, social security and ecological security, so it’s imminent to strengthen regional land use system security research, scientific evaluation of regional land use system security status and trends, propose land use system security protection for sustainable development strategies and measures. Heilongjiang Province is an important commodity grain production base and food strategic reserve base in China, is one of the three world famous black belt. Harbin city which located in the Songnen high plains of black soil is the capital city of Heilongjiang province and corn and soybean producing areas in China, but because of recent economic development and urbanization led to accelerated shrinking amount of arable land, severely damaged the predatory black soil cultivation making the gradual decline in land quality, then the Songnen high plains of black soil cultivated land use systems have been undergoing major changes and a serious threat to regional land use system security and sustainable development. Therefore, it’s representative sense to study of land use systems security in Harbin, and also an important guarantee to achieve regional and national food security.In this paper, view this system as a subsystem of land use system from the system structure, function and efficiency in three areas by using the system theory, combined with the actual situation in Harbin established Harbin land use system security evaluation system entropy, then use of improved entropy and gray correlation model to determine the weight of each index to dissipative structure theory, the next, established entropy flow model based on the dissipative structures theory and system entropy theory, using system entropy as the quantization standard of discrimination the system transformation direction, at the same time use the entropy as an evaluation of system and the external environment interaction with a reasonable degree to study the security of land use system in Harbin City and scientifically cultivated land use system security changes in the objective laws. By analyzing the impact factor of land use system security entropy, and thus targeted to take measures to prevent blind acts occurred during the implementation of "land use control system", establishing a reasonable regulation of the regional land use system security changes. On this basis, predict future trends in land use system security, and finally, combined with the land use system security status and trends of Harbin, puts forward the protection of cultivated land use systems in Harbin appropriate security measures, so as to provide guidance and reference to the development of regional social and economic development similar to the regional land use strategy and security studies.The results show that:(1) Harbin land use change in entropy of the structural security of the system status. Average annual entropy change of the structural security of land use system in Harbin city from1995to2009showing alternating positive and negative entropy state, changes in the range between-0.089to0.017, on the whole, the accumulation of negative entropy excess the positive entropy value; the structural safety of the total entropy of the system showing a first positive then the negative changes, the structure security of cultivated land use systems to improve safety conditions in the fluctuations.(2) entropy change status of the function security of land use system in Harbin city. Average annual entropy change of the function security of land use system in Harbin city from1995to2009showing alternating positive and negative entropy state, changes in the range between-0.014to0.014, on the whole, the accumulation of negative entropy excess the positive entropy value; the total entropy of the system functional safety in general is always negative, and negative entropy first increases and then decreases after that a further increase of the changes, land use system functions always in a safe and stable condition;(3) entropy change status of the effective security of land use system in Harbin city. Average annual entropy change of the effective security of land use system in Harbin city from1995to2009is always negative, varied from-0.042to-0.006;The total entropy change of system security benefits shows negative growth in the overall and the land use system security benefits steadily increased.(4) entropy change status of the total security of land use system in Harbin city. Average annual entropy change of the total security of land use system in Harbin city from1995to2009is always negative, and negative entropy first increases and then decreases after that a further increase of the changes, land use system is always in a safe state.(5) entropy change trend of the total security of land use system in Harbin city. Average annual entropy change of the total security of land use system in Harbin city from2010to2019is always negative, and negative entropy values showing a gradually increasing changes, the greater the negative entropy values indicate the degree of order within the land use system more high, the state more secure. The internal structure factors and the surrounding farmland environmental factors with relatively reasonable, the development of the system come to the safe condition. In response to these results, control measures were raised in three areas from the structure, function, benefits to protect security of cultivated land use systems in Harbin city: Through the transformation of low-yielding fields、optimize land use structure, a comprehensive structure of farmland ecological background、improve eco-efficiency of arable land, control of population growth、improve population quality、strengthen investment in agricultural science and technology、innovation and farmland protection, improve the farmland protection policies and regulations, increase the input of negative entropy flow outside the system and reduce the internal entropy flow in local conditions, the full realization of land use systems security and sustainable development.