陕西省耕地生态系统服务价值动态测评

为促进陕西省耕地可持续利用,中文采用耕地净第一性生产力测评模型和生态系统服务价值测评模型对陕西省耕地净第一性生产力、大气调节功能价值、涵养水源功能价值、水土保持功能价值和净化环境功能价值进行测评,并从省域和市域两个尺度分别探讨其动态变化特征。结果表明:1)2000～2009年陕西省耕地生态服务价值呈现上升趋势,10年共增加205.37亿元。各组分贡献率中,涵养水源价值贡献率最大,其次是水土保持价值,净化环境价值贡献率最小;2)从市域尺度分析,2000～2009年耕地生态服务价值增加最多的是榆林市,10年共增加96.95亿元;而减少最多的是安康市,10年共减少77.24亿元。从价值组分分析,大气调节价值增加最多的是榆林市,10年间共增加39.55亿元;水土保持价值增加较多的是西安市、延安市和榆林市,分别增加12.74亿元、10.7亿元和8.02亿元;涵养水源价值增加较多的是延安市和榆林市,分别增加31.23亿元和49.39亿元;而净化环境价值变化较小,除铜川市保持不变外,其余各市均呈小幅度减小趋势。

Dynamic change of ecological service value of cultivated land in Shaanxi Province

This research aims to promote sustainable development of cultivated land in Shaanxi province.Based on net primary productivity evaluation model and ecological service value model,net primary productivity,atmosphere adjustment value,water conservation value,soil and water conservation value,purify environment value was calculated and then applied to analyze the dynamic change at two scales of provincial and district.The results show:(1) Ecological service value(ESV) of cultivated land presented a trend of rise up again after decline from 2000 to 2009,with an increase of 20.537 billion yuan.Water conservation value possessed the largest contribution rate of all ESV components,soil and water conservation value were followed,and purity environment value had the minimum contribution rate.(2) From regional scale,the city with the most increase of ESV was Yulin from 2000 to 2009,while the most reduce is Ankang.From the analysis of value composition,Yulin had the most increase in atmosphere adjustment value,the increase of Xi'an,Yan'an and Yulin were more than other cities in soil and water conservation value,Yan'an and Yulin also had the more increase in water conservation,and all cities present a slightly reduce trend in purify environment except Tongchuan.