近20年柳江河流域生态系统服务价值变化研究

Dynamics of ecosystem services value in Liujiang River watershed in recent 20 years

以柳江流域为例,采用1980、2000年国土资源调查图表数据,计算研究区生态系统服务价值,分析土地利用变化情况及对生态系统服务价值的影响。结果表明:1980—2000年,林地面积一直居于首位,林地和耕地面积减少并向建设用地转变;研究期内生态系统服务价值总体呈缓慢下升的趋势,年均变化率为-0.009%;从功能方面,水源涵养、土壤形成与保护等服务性功能的价值远大于原材料和食物生产的价值;从结构方面,林地占生态系统服务总价值的66%以上。因此,在柳江流域城市建设和产业发展的过程中,应加强对林地和水域的保护,以实现流域的可持续发展。

Based on the data of land and resources survey of Liuzhou city, the information of land use was extracted in Liujiang River watershed from 1980 to 2000. Ecosystem Service Value （ESV） was estimated by ESV computing formula. The effects on ESV resulted from land use changes were explored. The results showed that the area of forest land has been the primacy from 1980 to 2000. The area of forest and cultivated land has decreased and been converted to construction land. The total ecosystem services value of study area has decreased with annual percent change of -0.009%. Among all ecosystem service function, water supply, soil formation and protection made the biggest contribution while the contribution rates of raw material and food production were small, which indicated that service function was more important than productive function. From the structure of ecosystem service values, the forest land was the main components with contribution rate over 66%. In the course of city construction and industrial development in Liujiang River watershed, forest land and water area should be protected especially in order to achieve sustainable development of the whole watershed.