我国东部典型县域耕地等别限制因素与提升对策

基于县域农用地分等更新成果，以我国东部典型县域为例，通过ArcGIS叠加分析与数据统计，探讨耕地质量等别分布特征，系统分析区域耕地质量等别限制因素，提出不同区域耕地质量的提升对策，以期为划定耕地质量保护与提升重点区域、开展土地整治与高标准农田建设、制定差别化的耕地利用保护政策提供理论依据。研究表明，5个典型县域耕地质量等别总体较高，以中、高等地为主，有少量优等地分布；各区域耕地质量共同存在的自然限制因素为土壤有机质含量，共同存在的利用限制因素为排水条件和灌溉保证率，此外还存在各自特有的自然或利用限制因素。土地整治应结合当地的自然条件、经济发展水平、耕地质量的分布特征与限制因素，因地制宜，采取差异化的策略，从数量、质量及生态方面保护和管理耕地资源。

GRADE LIMITS AND APPROACHES TO EASTERN CHINA S COUNTY LEVEL FARMLANDS

This paper, based on county level farmland grade achievement, uses ArcGIS to discuss the distribution of farmland quality and its factors in eastern China, and presents approaches to promoting farmland quality in different regions, so as to offer theoretical basis in marking farmland quality, promoting key regions, carrying out land consolidation and constructing high standard farmland, making differentiated farmland protection policies. Study shows that farmland quality is generally high, mainly medium to high but less excellent among five typical counties. Their common natural constraint is soil organic matters, and use constraints are discharge and irritation. Land consolidation shall take differentiated approaches to each region in accordance with local nature, economy, farmland quality and constraints, thus to protect and manage farmland resource from quantity, quality and ecology.