中国沙漠（地）生态系统水文调控功能及其服务价值评估

荒漠生态系统是整个生物圈中分布较广的一个系统,是陆地生态系统中一个重要的子系统。开展荒漠生态系统服务价值研究和评价,对荒漠生态系统重要性认识和管理具有重要的现实意义。本文基于中国沙漠（地）生态系统的生态水文过程、水平衡机理和水文调控功能等,对其在淡水提供、原盐生产、水源涵养和气候调节方面的物质流——水资源进行了核算,结合不同类型生态服务价值通量,初步评估了中国荒漠生态系统在水文调控方面的服务价值。结果表明:中国沙漠（地）生态系统水文调控方面的生态服务价值为每年5 510.05亿元,其中供给服务价值370.42亿元,调节服务价值5 139.63亿元,分别占总服务价值的6.72%和93.28%。

Evaluation on China Desert and Sandy Land Ecosystem Services Based on Its Related Water Process and Regulating Functions

Desert ecosystem is a wide distributed system in the global biosphere, and also an important subsystem in the land ecosystem. Evaluation on the desert ecosystem service has important practical significance on the acknowledgement to the desert ecosystem importance and management on the ecosystem. Based on the water process, water balance and water regulated function of the desert ecosystem, in this paper we calculated the water resources flow in the water supply for the daily use and other economic sections, salt production, water resources purification and storage and climate regulation, and combined with the different type of ecosystem service price flux, the desert and sandy land ecosystem service of water regulation was evaluated finally. The result showed that the total desert ecosystem service of water regulation was 5 510.05×108￥ per year, and within it the provisioning services value was about 370.42×108 ￥ per year, the regulating services value was about 5 139.63×108 ￥ per year, and the two service accounted to the total value 6.72% and 93.28%, respectively.