《Table 2 The economic value of different types of ecosystem services》

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《中国天山冰川生态服务功能及价值评估（英文）》

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To compare the similarities and differences of mountain glacial ecosystem services and the three major terrestrial ecosystems in forest（Li et al.，2016），grassland（Ye et al.，2006；Sun et al.，2011）and wetland（Sun et al.，2008；Xie et al.，2011；Tian et al.，2015），this article specifically collects literatures about the estimate of value of terrestrial ecosystem service based on the ecological function price method in Xinjiang in recent years（Table 2）.Although ecosystem types and service functions are different in various documents，and the comparative studies on the service function contribution rates are limited，they can still provide an important basis for the evaluation of the relative contribution degree，and a theoretical support for the optimization of the index system and the allocation of service functions.From a comparative analysis of the glaciers，forest，grassland and wetland ecosystems，the supply of freshwater resources/physical production and ecological regulation represent the main contributions of the four types of system，which account for 94.12%，69.57%，44.57%and 88.42%，respectively.In the forest and wetland ecosystems，the hydrological regulation/water conservation is the most valuable service function，and the purification environment/waste treatment is the greatest contribution in the grassland system.The biodiversity/habitat function provided by glaciers is much lower than that of other types of ecosystem.According to the principles of simplification and operability，in order to enhance the comparability of the service value of glaciers，forest，grassland and wetland per unit area，the original value of the other ecosystem services is converted to the economic value of 2010 by using the CPI index of different years.Compared with the ecological service value of ecological system per unit area，the service value of glacier per unit area in Tianshan Mountains（76 thousand yuan/ha·a）is the highest.The service value of ecosystems per unit area in wetland（Albea Lake，Boston Lake，Kekesu River）and forest（mountain forests in Xinjiang）show little difference，which are 40.5 thousand yuan/ha·a and 35.5 thousand yuan/ha·a respectively.Grassland（Xinjiang grassland，Yili river valley grassland）unit area ecological service value（8 thousand yuan/ha·a）is the lowest.Compared with other ecosystems，the mountain glacier resources have complete ecological service functions，and the function values of climate change inhibition and river runoff regulation are more valuable than those of other ecosystems.It is further confirmed that glaciers and meltwater have great influence on regional ecological environment security，industrial and agricultural development and social economy.