中文摘要：

以河北省滨海城市黄骅市为研究对象,以1992和2011年遥感影像为数据源,通过大量野外实地调查对遥感影像反演,建立了适于滨海盐碱地的基于盐碱地等级-地物标识植被特征-影像特征的分级分类解译标志系统.在此基础上采用遥感影像解译的监督分类法,提取了黄骅市盐碱耕地信息,进一步分析了1992—2011年间盐渍化耕地面积、盐碱等级转换及空间分布变化的特征.结果表明：研究期间,黄骅市耕地盐渍化程度减轻;与1992年相比,2011年黄骅市盐碱生态系统中重度和中度盐渍化耕地的面积减少,非或轻度盐渍化耕地面积增加,黄骅市东南部大量的中度盐渍化耕地转换为非或轻度盐渍化耕地,远离海岸线的黄骅市西部重度盐渍化耕地转换为中度或非或轻度盐渍化耕地;重度和非或轻度盐渍化耕地的重心向东部海岸线转移,中度盐渍化耕地的重心由东南海岸线向西北方向转移.黄骅市盐碱耕地变化的主要影响因素是气候、水文条件和人类活动.

英文摘要：

This paper developed a new interpretation symbol system for grading and classifying sa- line-alkali land, using Huanghua, a cosatal city in Hebei Province as a case. The system was devel- oped by inverting remote sensing images from 1992 to 2011 based on site investigation, plant cover characteristics and features of remote sensing images. Combining this interpretation symbol system with supervising classification method, the information on arable land was obtained for the coastal saline-alkali ecosystem of Huanghua City, and the saline-alkali land area, changes in intensity of salinity-alkalinity and spatial distribution from 1992 to 2011 were analyzed. The results showed that salinization of arable land in Huanghua City alleviated from 1992 to 2011. The severely and moder- ately saline-alkali land area decreased in 2011 compared with 1992, while the non/slightly saline land area increased. The moderately saline-alkali land in southeast transformed to non/slightly saline-alkaline, while the severely saline-alkali land in west of the city far from the coastal zone became moderately saline-alkaline. The center of gravity （CG） of severely and non/slightly saline- alkali land moved closer the coastline, while that of the moderately saline-alkali land moved from southwest coastal line to northwest. Factors influencing changes in arable land within the saline- alkali ecosystem of Huanghua City were climate, hydrology and human activities.