基于GIS技术的基本农田划定研究  ———以重庆市黔江区金溪镇为例

基本农田的划定是土地利用总体规划中一个极其重要的环节,将高质量的耕地划入基本农田,是土地利用规划的基本要求。作者结合编制重庆市黔江区金溪镇土地利用总体规划实践,运用GIS技术和相关评价体系,通过对耕地图斑的"评分"、"排序",对土地利用总体规划中基本农田的划定方法进行探讨和研究,并依据得出的决策模型划定金溪镇基本农田保护面积共1 586.59hm2,在数量和质量上均已达到上级规划下达的指标,为促使土地利用规划工作更加高效和深入的展开做好基础工作,也为西南丘陵山区土地利用总体规划中基本农田的划定提供参考和借鉴。     

农地流转多重主体博弈分析—兼论农户权益保障

土地流转是实现农业规模化、集约化发展的必经之路.农地流转是多重主体利益博弈的结果.在转入方、转出方、中介机构和政府的多方博弈中,农户处于弱势地位,其土地权益难以保障.应构建合理的农户权益保障机制,约束企业、政府不合理的利益扩张行为,使土地流转博弈框架回归“帕累托优化”均衡.     

How does off-farm work affect chemical fertilizer application? Evidence from China’s mountainous and plain areas

There is a rising concern that the ongoing wave of off-farm employment will have profound effects on agriculture-based environment problems-measured by the intensity of chemical fertilizer (CF) usage. Yet, our understanding of the regional heterogeneities of this effect remains scant. This research gap is addressed by using panel data of selected cities in Sichuan and Henan provinces in China, which are representative mountainous and plain regions respectively, to empirically examine the impact of off-farm employment on CF use. Our findings indicated that there exists an inverted “U” shaped relationship between off-farm employment and CF use in the mountainous region, whereas CF use is positively correlated with off-farm employment in the plain area. The increased CF inputs, which resulted from the substitution effect and remittance effect, can compensate for the negative effect of labor loss, while land marginalization is the main reason for the decrease in CF consumption at the later stage of urbanization in the mountainous region. Meanwhile, the deagriculturalization of farmers’ employment patterns decreases the intensity of CF usage, which resulted from the scale effect produced by land transfer and large-scale management in the plain region. Besides, the evolution pattern of this effect may present a similar trend in these provinces, but the turning point of plain regions would appear later than that of mountainous areas due to the inherently unique physical conditions and socio-ecological contexts. Based on the empirical results of this paper, some policy recommendations are provided.     

扩展式卡诺图对多变量布尔函数的化简

本文提出了卡诺图的一种改型结构─—扩展式卡诺图，给出了这种卡诺图的形成规则，讨论了运用护展式卡诺图化简多变量布尔函数的方法。     

The Effect of Farmland Preservation Programs on Farmland Prices

Government agencies in urbanizing areas are increasingly utilizing purchase and transfer of development rights programs to preserve farmland and protect local farm economies. This paper tests the effect of development restrictions imposed by permanent easement sales on farmland sales prices, using Maryland data. We correct for selectivity bias due to the voluntary nature of these programs in estimating hedonic sales equations. Although preserved parcels' actual land values are lower, the effect of the restrictions is not statistically significant. These findings may encourage additional participation in preservation programs or justify reductions in the easement prices paid by agencies.     

长春净月潭实施以退耕还林为主的生态环境建设的探讨

生态环境是指与人类生存和发展密切相关的自然环境。保护和改善生态环境，实现可持续发展，是我国现代化建设中必须坚持的一项基本方针。本文主要论述了长春市净月潭实施的以退耕还林为主的生态环境建设的意义，提出存在的问题及解决建议，以达到我省生态环境建设的良性可持续发展的要求。     

TM1：5万卫片在内蒙古科右前旗耕地变更调查中的应用

介绍了ＴＭ１：１万卫片在内蒙古科右前旗耕地更调查中的应用，分析了耕地变更情况及变更趋势。     

建立农田水利建设新机制

在充分认识农田水利建设新机制的重大意义的基础上,分析建立农田水利建设新机制的指导思想和原则,点明建立农田水利建设新机制的工作重点。     

海西农牧区富余劳动力转移和就业的新思考

本文在对海西农牧业劳动力转移和就业情况进行梳理的同时,分析了存在的问题,提出了促进海西农牧区剩余劳动力合理转移的建议。