镇赉县景观格局与生态系统服务价值变化

Variations in Landscape Pattern and Ecosystem Service Values in Zhenlai County

以镇赉县为例,基于2000年和2007年两期Landsat ETM遥感影像,在地理信息系统和遥感技术的支持下,采用景观格局分析方法,应用生态系统服务价值算法,揭示了因景观格局动态变化导致镇赉县生态服务价值的动态变化。结果表明:耕地、水域、湿地、居民工矿用地面积明显增加,林地、草地面积明显减少;镇赉县生态系统服务价值总体呈上升趋势,耕地、湿地和水域的价值贡献率超过了89%,成为构成镇赉县生态系统服务价值的主体;就单项服务功能价值而言,气候调节、土壤保持和水源涵养价值贡献率超过了70%,各景观类型生态服务价值的弹性系数都小于1,湿地、水域和林地的变化对生态服务价值变化起到放大作用。

With the technical support of GIS and RS,the dynamic variations in ecosystem services in response to landscape pa-tterns were revealed on the basis of Landsat ETM data in 2000 and 2007 by the methods for landscape pattern analysis and the calculating equation of ecosystem service values taking Zhenlai County of Jilin Province for instance.Results show that the landscape patterns have changed significantly.There is a notable increase in farmland,water body,wetland,residential area,and industrial and mining areas,and an obvious decrease in forestland and grassland.An overall increasing trend of ecosystem service values was observed form 2000 to 2007.The functional values of farmland,wetland and water body constitute the principal parts of ecosystem service values,with a total contribution rate of 89%.Among the ecosystem services,soil conservation,climatic regulation and water conservation are the most important parts,accounting for over 70%.The calculation also indicates that the elastic coefficients of all the landscape patterns are less than 1,and the changes in wetland,water body and forestland magnify the change of ecosystem service values.