摘要
退耕还林(草)工程作为黄土高原植被建设的主要措施,对于加速黄土高原生态环境恢复有着巨大的作用。基于耕地压力指数,以陕西省延安中尺度水土保持与生态环境建设试验示范区为实证研究对象,评估了该区退耕还林(草)工程实施以来对粮食安全的影响。结果表明,退耕还林(草)工程实现了以粮食换生态的目的,使北部森林草原区耕地压力下降了75.5%,南部森林区则基本持平。2003年以来,由于退耕还林(草)工程粮食补贴政策的变化以及随着该工程的结束,复垦现象时有发生。2004—2009年北部森林草原区和南部森林区耕地压力较2003年分别增加了1.8～4.8倍和1.1～1.7倍。南部森林区2007年后耕地压力大于1,应引起重视。今后仍需保证粮食补贴的长期性与稳定性,确保生态恢复可持续发展。
The grain for green project,as a major measure for vegetation construction,plays a very important role in accelerating eco-environment restoration on the Loess Plateau.Based on the arable land pressure index,the effects of the grain for green project on food security were evaluated by taking the Yan′an demonstration area of soil conservation and eco-environmental construction as a study object.Results showed that the grain for green project has achieved the purpose of＂food for ecology＂.Arable land pressure decreased by 75.5%in northern forest—meadow region and remained balance basically in southern forest region to a large extent.However,arable land pressure rebounded and reclamation occurred sometimes due to the ending of the project and the change of food subsidy policy after 2003.Arable land pressure from 2004to 2009was 1.8～4.8and 1.1～1.7times of that of 2003in the north and the south,respectively.Among them,arable land pressure for the south was greater than 1after 2007,which should be paid more attention.Longevity and stability of food subsidy should be ensured in future,so as to insure the sustainable development of ecological restoration.
出处
《水土保持通报》
CSCD
北大核心
2013年第3期241-245,共5页
Bulletin of Soil and Water Conservation
基金
中国科学院战略性先导科技专项"退耕还林(草)工程固碳速率和潜力研究"(XDA05060300)
中国科学院百人计划择优支撑项目"土壤侵蚀机理"
黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金基项目(K318009902-1313)
