关键词: 张北县, 退耕还林还草, 粮食安全, 调控机制

Abstract:

The conversion of cropland to forestland or grassland is an effective way to restore degraded ecosystem.However, to some extent,it may necessarily influence the food security of some regions.This paper took Zhangbei County of Hebei Province as an sample of research object and analysed the impact of conversion of cropland to forestland or grassland on grain production.According to the model of minimum cultivated area per capita and the index of farmland pressure, the evaluation of food security in the villages and towns of Zhangbei County was conducted.Based on the evaluation of food security, the regulative mechanism for the project of the conversion of cropland to forestland or grassland was built up,which ensure that the project of the conversion of cropland to forestland or grassland was executed more sustainedly,steadily and healthily.

Key words: Zhangbei County, Conversion of cropland to forest and grassland, Food security, Regulative mechanism