摘要
耕地保护是基于耕地功能需求的保护,生产功能、生态服务功能和景观文化功能等需求是巨型城市区基本的耕地功能需求,其耕地保护阈值应考虑这种耕地多功能需求的区域特殊性。论文以耕地多功能管理为基本理论依据,以现有耕地保护阈值研究为基础,结合生态绿当量、碳氧平衡法和景观格局分析等最小生态用地需求量测算理论和方法,构建了集粮食生产功能和生态服务功能需求于一体的巨型城市区耕地保护阈值测算模型。模型侧重于潜在粮食生产能力的保护和现实生态用地结构的优化,将保护阈值区分为实有耕地保护阈值和其他可耕地保护阈值两部分。到2030年末珠江三角洲耕地保护总阈值为104.17×104hm2,其中实有耕地保护阈值48.16×104hm2,其他可耕地保护阈值56.01×104hm2,模型具有一定的可行性。
Cultivated land is the primary resource for the sustainable development of agriculture, society and economy, and its protection has become one of the core objectives of land policy-making in China. Food production, ecological service and sightseeing are the basic functional demands in mega-urban regions, forming the regional particularity which should be fully analyzed in the threshold calculation of cultivated land protection. In a given time period, the demand degree for a certain function in a region depends on the supply sources of the function and its alternatives, and the factual function may not be consistent with the demands as a result of function's imports from other regions. The total demand for grain has increased dramatically in mega-urban regions since more and more people have settled there. While sufficient food supply from domestic and international grain market has secured the great consumption, the factual grain production function of cultivated land has become weaker and weaker, but the potential grain production capacity of arable land should be a primary objective so as to face the unexpected challenge of food shortage. It is arable land, not only cultivated land, should be protected from this perspective. The demand for social security function of cultivated land is decreasing because more efficient rural social security system has been established in mega-urban regions. Demands for ecological functions, such as soil conservation, hydrologic modulation,air cleaning, and insulating construction land, have increased greatly as a result of serious ecological and environmental problems, while it cannot be imported from outer regions just as the grain consumption does, and also it cannot be supplied by'travel'just as sightseeing function does, it must depend on the region itself. So the ecological function should be an important concern in the calculation of cultivated land protection threshold. Furthermore, cultivated land should be planned systematically within the whole ecological land system
出处
《自然资源学报》
CSSCI
CSCD
北大核心
2015年第8期1255-1266,共12页
Journal of Natural Resources
基金
教育部人文社会科学研究青年基金项目(12YJCZH034)
广东省优秀青年创新人才培养计划项目(2012WYM-0036)
广东省软科学基金项目(2010B070300064)
关键词
耕地保护
耕地保护阈值
耕地多功能需求
生态安全
巨型城市区域
珠江三角洲
cultivated land protection
threshold of cultivated land protection
demands for multifunctional cultivated land
ecological security
mega-urban region
the Pearl River Delta
