水土保持型国家重点生态功能区生态环境极其脆弱,是我国水土流失发生的重灾区,其生态系统状况长期以来为社会各界高度关注.本研究基于NPP、土壤保持量和水源涵养量等指标对其重要生态系统服务功能及其价值进行了评估.评估结果表明,我国水土保持型生态功能区生态系统服务总价值为3268.90×108元,其中有机物生产、营养物质循环与贮存、固碳释氧、土壤保持和水源涵养价值分别为530.96×108元、301.91×108元、1177.12×108元、442.70×108元和816.20×108元.四个分功能区中,桂黔滇区总价值最高,三峡库区最低,分别为1616.16×108、448.15×108元;而单位面积生态系统服务价值中,桂黔滇区最高,三峡库区和大别山区相当,黄土高原区最低.%National key eco-function zones for water and soil conservation are exceptionally fragile areas in terms of their eco-environments and are also severely affected by water and soil loss.They have been a focus of attention from all sectors of society.This research assesses important ecosystem service functions and their values using such indexes as NPP,soil conservation quantity and water conservation quantity.The result indicates that the ecosystem services of China's eco-function zones for water and soil conservation are worth 3268.90× 108 CNY in total,of which organic matter production accounts for 530.96×108 CNY,nutrient substance circulation and storage 301.91 × 108 CNY,carbon fixation and oxygen release 1616.16× 108 CNY,soil conservation 442.70× 108 CNY and water source conservation 816.20x108 CNY.Of the four functional zones,the Guangxi-Guizhou-Yunnan Area registers the highest value of 1551.30 × 108 CNY,and the Three Gorges Reservoir Area the lowest value of 448.15× 108 CNY.In terms of ecosystem service value per unit of area,the Guangxi-Guizhou-Yunnan Area takes the first place,followed by Three Gorges Reservoir Area and the Dabie Mountain Area,which are roughly equivalent,and finally the Loess Plateau Area is at the bottom.
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