Analysis on farmland conversion and countermeasures of agricultural land protection

The economic inducement of the conversion of farmland into nonagricultural land was analyzed based on the classical theory of bid rent and marginal returns-cost.It shows that there exists lower farmland comparative benefits and expropriation cost;also the external benefits of farmland conversion are not being realized.The countermeasures of farmland protection were put forward from theoretical reasoning: farmland expropriation cost should be increased;ecological value and social value should be included in farmland conversion price;and the property of farmland external benefits which owned by peasants should be enacted and transferred.