A Study On The Spatial-Temporal Distribution Characteristics Of Farmland In The Northern Sanjiang Plain In Recently55Years

The social of farmland is increasing. Micro relating to personal food and clothing, Social stability in the macro. Large population and little arable land is very conspicuous contradictions. Less than10%of the world arable land, carrying22%of the world’s population. Since the founding of new China, our country has experienced the acceleration of industrialization, the agricultural adjustment, economic development, real estate development and population expansion and intense city a series of processes such as land use. The land useing has undergone tremendous changes. Arable land to make way for construction land, Resulting in the decline of arable land Continued. Entry into the WTO has accelerated this trend. According to the statistics of Land and Resources,19.51million mu of cultivated land quantity of the end of the first end of the land survey in1996, Reduced to18.26million mu in the end of2007, Between11years cultivated land is a net decrease of1.25million mu in China. decrease of0.11million mu Average annual. With the impending peak of China’s population and people’s living standards rising, Arable land resource security as the core of national food security problems have become increasingly subject to the great concern of the government and the majority of the scholars at home and abroad.. In addition, Arable land has multiple attributes,such as Production attributes, economic attributes, social attributes. Therefore,arable land to become the hotspot of the population, resources, environment, development and related areas such as research, Also become the focus of conflicts, The predominant mode of land reclamation as cultivated sources,to Arable land reclamation research conducive to grasp the use of the status quo, then to understand national food security dynamic, So need to study in the objective.This article take the sustainable development theory, theory of man-land relationship theory, land system, land use/land cover theory, property rights theory as the theoretical basis, combining the study area cultivation history and social economic statistical data, in19541:100000topographic map, MSS image in1976,1996TM image, CBERS image in2009and administration regionalization map as the main data source, using GIS spatial analysis method and mathematical statistics method analysis of the northern part of Sanjiang plain area reclamation amount, flow, regional differences, centre of gravity of the migration characteristics, as well as with the qualitative analysis, from main body, object, reclamation reclamation reclamation external environment three aspects as well as the macro level, middle level, microcosmic level three levels of analysis in northern Sanjiang plain of cultivated land driving force, through analysis the following conclusions:1) The arable performance for sustained, rapid increasing trend In recent55years in north of Sanjiang Plain in recently55years However, the annual rate of change showed a declining trend.2) Marsh, grassland, woodland into farmland increase main source, which marsh> grassland> forest land, but still there is a big difference in different periods3) North of Sanjiang plain the research area between land reclamation exhibits strong differences4) From1954～2009, the north of Sanjiang Plain Farmland gravity constant migration occurred, from southwest to northeast direction of migration, migration into east main direction, direction for the north face, but for55years the center of cultivated land in Fujin City area fall5) Cultivation, cultivation, cultivation of subject object external environment drive reclamation of three great power.6) The central government, local government, farmers as the main body of land reclamation at different levels, through their respective function, behavior common drive land reclamation7) Cultivation object quantity quality before and after cultivation, cultivation object of resource value added for the land reclamation object driving force, they hand give the reclamation land reclamation feasibility provide, hand cultivation object by reclamation value increment, the two jointly drive land reclamation.8) Science and technology, the natural environment for the cultivated land driving force for their external environment, land reclamation body provides a more efficient means of cultivation, more favorable cultivation environment, at the same time, they accelerate the cultivation object to enhance the value of the speed and extent, and also reducing environmental factors for the growth of crops, thereby increasing the reclamation feasibility degree. By acting on the main body, object reclamation reclamation, indirect drive reclamation land reclamation, become accelerated factor.9) the study area reclamation rate has stabilized phase, so the north of Sanjiang plain to ensure food safety and the implementation of the policy, social harmony and stability, social responsibility, the development of regional economy and regional strategic positioning, as well as from agricultural big province to agricultural strong province of successful transformation, which must be from through land reclamation farmland to dilate external extension development, transition to increase farmland quality, the introduction of improved agricultural production technology, improve agricultural infrastructure and other content agriculture development path.