A Case Study Of Tianshui City In Gansu: Food Security Based On The Protection Of Cultivated Land Resources

Food is closelyrelated to people's livelihood,social development and stability.Food securitymakes an important part in the national economic securitysystem.Notonlydeveloped but also developing countries are veryconcerned about it,especiallyfor our country with such a large population, food securityproblem is much morecompelling.Cultivated land is the most fundamental material basis which people relyon for production and development and the indispensable means of production forhuman to obtain food as well as other agricultural products.It plays the fundamentalfunction in sustainable development of agriculture and the national economy.Therefore,to maintain a certain amount and quality of cultivated land resources andthe basic food supplyis directly related to economic development,social stabilityandnational security.This article takes the city ofTianshui in Gansu with backward economy andrelativelylow level of urbanization as an example.First,it analysis the present status ofland utilization and food securityof Tianshui;then followed bythe use of minimumland area of law and the pressure index in order to evaluate the food security situationofTianshui Cityobjectively;finallyit forecasts several indexes including thepopulation, per capita grain consumption demand,total demand for food ,arable landsown area of grain crop production,multiple crop index,the ratio of grain sown area ofthe total sown area of Tianshui Citybyusing a mathematical model.On the basis ofthe prediction results and with comprehensive consideration of food self-sufficiencyrate,this article uses food security-based demand for food law to forecast the needs ofcultivated land in the year of 2010 and 2020 in Tianshui City,meanwhile,it putsforward some countermeasures on farmland protection.The results show that:(1)Between 1996 -2005, the total area of arable land inTianshui Cityhad beenreduced by41149 hm₂,the average reduction is 4115hm₂,per capita arable land areadecreased by0.03 hm₂,while total population increased by28.90 million,with anaverage net annual increase of 2.890 million;total grain output increase production is56 570 ton,the average annual yield is 0.5666 million ton;grain yield increased432.94kg/hm₂,average annual yield is 43.29kg/hm₂,per capita food productionincreased 124.76 kg / person,with an average annual increase of 12.48 kg / person.(2)Between 1996-2005,the overall change of the pressure index takes adecreasing trend,the pressure on arable land becomes less and less.But the pressureindex always keep above 1,the actual per capita arable land area is smaller than thesmallest per capita arable land,cultivated land pressure seems obvious indeed.Iffood production can not meet the normal demand,food crisis mayoccur.With thegrowing population ofTianshui City,per capita food consumption,s continuousdeveloping,expanding land for construction,ecological restoration,etc,the per capitaarable land keeps declining of the City,the pressure index will be more than 1 in thelong term,farmland protection situation is not optimistic.(3) Use food safetylaw to forecast the demand of arable land during the planningperiodofTianshuicity:itrequires513526hm₂of cultivatedlandin2010,and475560hm₂in 2020.