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1Analysis of Comprehensive Benefits of Transforming Slope Farmland to Terraces on the Loess Plateau:A Case Study of the Yangou Watershed in Northern Shaanxi Province,China显示文摘De-farming slope farmland has been an effective measure in recent years to improve environment and prevent soil and water loss on the Loess Plateau.There are different views about the defarming method,and also various de-farming patterns have been put into practice.This paper takes the Yangou Watershed in Shaanxi Province of China as a case for studying the comprehensive benefits of transforming slope farmland to terraces.Based on the day-by-day meteorological data of the Yan'an station in 2005 and the data of terrain features,soil and land use data of the Yangou Watershed,the impact of transforming slope farmland on terraces were simulated and analyzed in aspects of yield increase and water-soil conservation under different topographic conditions with the aid of software WIN-YIELD.Furthermore,an empirical analysis was applied to study the effects of transforming slope farmland to terraces in the Yangou Watershed.The results show that:(1) The bigger the topographic gradient is,the more remarkable benefits it has in yield increase and water-soil conservation.(2) Farmland with slope below 5° could be retained,but farmland with slope above 15° should be converted to forest or grassland as soon as possible.(3) Transforming slope farmland to terraces has the same remarkable effects as the current policy of 'Relieving and de-farming' in improving agricultural production conditions,safeguarding food security,raising permanent vegetation coverage rate,and preventing soil and water loss.Besides,it is more cost-effective than the policy of 'Relieving and de-farming'.It's strongly suggested that the policy of transforming slope farmland to terraces be carried out on the Loess Plateau without delay.XU Yong YANG Bo TANG Qing LIU Guobin LIU Puling 2011Journal of Mountain Science2011,8,3:8
2我国粮食安全责任战略的实现行为研究显示文摘本文采用行为经济学的系统研究方法,分析了国家粮食安全责任战略的实现行为及相互关系。笔者认为,提出国家实施积极的粮食安全责任战略必须大力营造粮食安全责任的良好社会行为环境,努力发挥政府行为的主体性和主导性,充分利用市场行为的有效性和基础性,不断提高粮食安全责任的农户行为积极性和创造性,着力推进粮食产区粮食安全责任行动战略。罗光强 2012农业经济问题2012,33,3:7
3De-farming and Ecological Restoration in the Loess Hilly-gully Region in Northern China显示文摘De-farming has been a powerful measure taken by the central and local governments of China for ecological restoration in the loess hilly-gully region since 2000. In years past, aid-based de-farming pattern was far and wide popularized in the region and terrace-based de-farming pattern demonstrated in a few small watersheds was also rather effective for ecological restoration. After summing up the features of three patterns (aid-based de-farming slope farmland more than 25°(AD25), aid-based de-farming slope farmland more than 15° (AD15) and terrace-based de-farming (TD)), this paper analyzed the regional difference of these patterns in de-farming area, ecological restoration, investment demand and so on. The results show that there are two crucial areas in the loess hilly-gully region for ecological restoration at the moment, the policies adaptation to the different areas should be constituted as soon as possible and the limited fund should be devoted to the two crucial areas.XU Yong TANG Qing MA Dingguo GUO Tengyun 2006Journal of Mountain Science2006,3,2:4
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