Study On Elasticity Changes And State Evaluation In Cultivated Land System

As the developing of industrialization and urbanization,the contradictionsbetween cultivated land and human are becoming increasingly acute and the pressureof demand for grain increases,which force us pay more attention to China’s limitedarable land resources. This article through the analysis found that the compoundsystem of cultivated land resources under a certain degree of pressure effect, thereaction of self-adjustment of the cultivated systems and artificial recovery to makeit present a certain degree of ability to withstand pressure and toughness as a solidmaterials, with a certain flexibility. When pressure is too large, and the reactionimbalances, cultivated land system will show the plasticity of similar materialsproduced by external force deformation. In this case, this paper puts forward thecultivated systems can be approximate seen as an elastomer, according to the size ofthe force will show a different change state. The main contents of the article are asfollows:On the basis of elastomechanics of the stress-strain relations theory, with theobject due to the force generated by elastic deformation and plastic deformationleads to the concept of elasticity and plasticity of cultivated systems; Established theevaluation index system according to the substance of the cultivated systems’flexible operation; Using a Method of combining Analytic Hierarchy Process and theComposite Index Method to analysis and evaluation the elastic state of cultivatedsystems. Finally select the Daxing District of Beijing’s cultivated land system toconduct empirical research, Through the analysis of its operation and evolution ofthe process, identify and remove the hidden factor affecting the system work,provide a reasonable reference and early warning for farmland protection.The results of the study show that:(1) The cultivated systems’ ability towithstand pressure and toughness make it with a certain degree of elasticity toproduce different changes, depending on the size of the influence,it provides a basisfor transplantation and application of the stress-strain relations theory;(2) Thecultivated systems implements a transition from weak elastic state to the elastic state between2001to2009; Comprehensive productivity, the structure stability andeconomic vitality are all in high levels, in which structural stability and economicvitality to show the convergence; Regional recuperability and environmentalcoordination of cultivated land system is weak elastic and elastic-plastic state,affecting the development of the main limiting factor is the region’s per capitacultivated land reserve resources, the unit of arable fertilizer load and farmlandlandscape fragmentation;(3)11towns ’cultivated systems of elastic evaluationaverage from weak elastic to elastic, by geographic conditions and the environmentalimpact of socio-economic, Northwestern part of the farmland system elastic runningis poor, such as Huangcun, Beizang and Yinghai, in a weak elastic state, thesoutheast region of farmland system elastic running is relatively well;(4) Selectedadjustable agricultural land area of Daxing district2009with the elasticcomprehensive evaluation result for correlation analysis, the results verify thecultivated systems in the flexibility of the comprehensive evaluation has certainrationality and feasibility.Adjustable agricultural land area and the increasedcultivated land area through Land renovation add up to3836.49hectares In Daxingdistrict2020, As a result of each township’s scale of cultivated land occupied by thenew construction is different, elasticity of arable land in each township to bedifferent than in2009.