喀斯特石漠化生态系统服务价值研究

摘要

以涵养水源、保育土壤、固碳制氧、有机质生产和净化大气环境为功能指标,定量评估了毕节鸭池示范区、清镇红枫湖示范区和关岭-贞丰花江示范区的生态系统服务价值。结果显示：研究区涵养水源、保育土壤、固碳制氧功能对区域总价值的贡献率高,有机质生产和净化大气环境功能贡献率低;单位面积的服务价值在各景观中表现为林地〉灌木林地〉草地〉旱地〉农田,分别为2 335.39万元、1 063.01万元、503.67万元、338.12万元和250.88万元;三个示范区单位面积的区域服务价值表现为鸭池〉红枫湖〉花江,分别为1 244万元、591万元和440万元,与区内石漠化发生率呈负相关关系。研究表明,在恢复和重建石漠化地区的生态环境过程中,增加林草植被面积,促进旱地和农田向林地、灌木林地和草地的转化,将有助于生态服务价值的提高。%taking water conservation （ Ⅰ ）, soil conservation （ Ⅱ）, CO2 absorption and 02 production Ⅲ）, organic matter production （Ⅳ）, purification of atmosphere （Ⅴ） as indexes, service value of ijie Yachi, Qingzhen Hongfenghu and Guanling-Zhenfeng Huajiang Demonstration Areas is esti- mated. Results show that Ⅰ , Ⅱ and Ⅲ functions make more contribution to the region＇s total value while Ⅵ and Ⅴ functions make less. The order for all landscapes is forest, shrub land, grassland, dry crop land and paddy field according to service values per square kilometer from large to small which is 2 335.39 million yuan, 1 063.01 million yuan, 503.67 million yuan, 338. 12 million yuan and 250. 88 million yuan respectively. The order for the three demonstration areas is Yachi, Hongfenghu and Huajiang according to their service value per square kilometer from large to small which is 1 244 million yuan, 591 million yuan and 440 million yuan respectively. And there is a negative correlation between service value and region＇ s rocky desertification rate. Therefore, increasing the area of forest,shrub land and grassland, and promoting the conversion of dry crop land and paddy field to them in the process of rehabilitating and rebuilding the region＇ s eco-environment in rocky desertification areas will benefit its ecosystem＇ s service value.