中文摘要：

通过RS和GIS平台,综合运用遥感影像、统计报表及抽样调查数据,研究粮食主产区县域土地利用变化及其生态安全状况。模型分析表明,在当前快速城镇化的背景下,近6年来河南省新郑市高景观生态功能性用地内部转移加剧、单一功能基础设施用地增加明显,达82.89%,高通道、高增长区域结构演变相对剧烈,平均幅度超过5.56%,整体呈现＂Y＂型支撑、外围交错散布土地利用变化空间格局。相对应,土地利用结构变动引致土地生态安全性降低,且表现出各区域同向退化、整体均衡趋势。进一步研究发现,城镇化速度与土地利用结构变动呈正相关,切实影响生态环境,贡献率超过45%,远大于工业化及其他因素,而指向性土地制度因素对生态安全影响较小。

英文摘要：

The land use change of county region and its ecological security situation in major grain-producing area were analyzed based on RS and GIS technology by comprehensively utilizing remote sensing image, statistics statements as well as survey data. Model analysis indicated that in the pest 6 years, the internal transfer of land-use for high-level landscape ecological function in Xinzheng city has been aggravated; lands for single-function infrastructure has been increased remarkably up to 82.89%; the evolution of high-path and high-increase regional structure was relatively severe as the average increase range was higher than 5.56%, which formed a pattern of spatial variation with a ＂Y＂ shape supportation as well as interlaced distribution outside. Accordingly, the variation of land-use structure resulted in low ecological security for land and had the trends of degradation in same direction but overall well-balanced in each region. Further studies showed that the speed of urbanization was closely related to variation of land utilization structure with practical effect on the ecological environment with the contribution rate higher than 45%, which was much larger than industrialization and other factors; and the effect of directed land system factor on the ecological environment was less.