张北县退耕还林对粮食生产的影响分析

Analysis of the Impact of Converting Cropland to Forest and Grassland on Grain Production in Zhangbei County

退耕还林是退化生态系统恢复的一种有效途径 ,但在一定程度上必然会影响到区域粮食安全。本文以河北省张北县作为案例 ,对退耕还林还草可能对当地造成的粮食生产影响进行了分析。利用最小人均耕地面积和耕地压力指数模型对该县各乡镇进行了粮食安全评价 ,在此基础上 ,构建了张北县退耕还林还草工程调控机制 ,以确保退耕还林 (草 )工程持续、稳定、健康地进行。

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.