中文摘要：

运用3s技术，分析和探讨了豫北平原的内黄县1979--2003年的生态系统服务价值变化．土地利用变化直接影响生态服务价值，该区25年间的生态系统服务价值变化显著，呈增长趋势．耕地和林地生态系统服务功能约占总服务价值的80％～90％．结果表明：25年来内黄县研究区域的生态环境质量呈不断上升的态势，生态系统服务价值增加逾2．6×10^8元．研究区内的林地、园地面积不断增加，增加的面积部分主要源自未利用地，而另一部分则是由耕地转变而来．这一方面反映了人口增长和经济建设需求对生态环境变化的积极影响，另一方面也反映了研究区人民和相关部门重视生态环境，环保意识增强．

英文摘要：

Based on 3S technology, this research analyzed and discussed variation characteristics of the value of ecosystem services in Neihuang County of the North Plain of Henan Province during the period 1979 to 2003. Results showed that differences in land utilization had a direct impact on the ecosystem services value, which experienced remarkable increases during the last 25 years in the study area. Ecosystem services from cultivated fields and forests accounted for about 80% to 90% of the total service value. Eco- environmental quality of the studied region improved during the last 25 years, and the value of ecosystem services increased by 260 million yuan. In the study area, the area of woodlands and gardens increased, part of which were transferred from unused lands, and others came from cultivated land. This tendency reflects the positive impact of population growth and economic development needs, as well as demonstrating that local residents and authorities are more aware of environmental issues and paying more attention to the ecosystem.