北方农牧交错带耕地利用变化对生态系统服务价值影响——以宁夏回族自治区吴忠市为例

Impact of Cultivated Land Use Change on Ecosystem Service Value in the Northern Agro-Pastoral Transitional Zone--A Case Study of Wuzhong City,Ningxia Hui Autonomous Region

为测度耕地利用变化对生态系统服务价值的影响,并为科学制定耕地可持续利用和生态环境保护政策提供依据,以位于北方农牧交错带的吴忠市为研究区,基于2009年、2013年、2017年的土地利用现状数据,采用土地利用图谱和当量因子法,定量测度并揭示了2009—2017年吴忠市生态系统服务价值演变及对耕地利用变化的响应规律。结果表明:2009—2017年,吴忠市生态系统服务价值逐年降低,由158.26亿元降低至156.46亿元;吴忠市耕地利用变化模式以前期变化型和后期变化型为主;在前期变化、后期变化和持续变化3种耕地利用变化模式下,生态系统服务价值均有不同程度的损失。吴忠市部分不合理的土地利用模式导致了生态用地数量减少和建设用地大规模扩张,是其生态系统服务价值降低的重要原因。

In order to measure the impact of cultivated land use change(CLUC)on ecosystem services values(ESV),and to provide a basis for scientifically formulating policies for the sustainable utilization of cultivated land and ecological environment protection,Wuzhong City,located in the northern Agro-Pastoral Transitional Zone,was selected as the typical study area.Based on the land use status data in 2009,2013 and 2017,we used atlas of land use and the equivalent factor method to measure and analyze the evolution of ESV in Wuzhong City from 2009 to 2017 and its response to the CLUC.The results show that:the ESV in Wuzhong City decreased year by year during the study period,from 15.826 billion yuan in 2009 to 15.646 billion yuan in 2017.In addition,we found that the types of CLUC in Wuzhong City were dominated by the early change and the late change.Furthermore,the ESV was lost to different degrees under the three types of CLUC,including the early change,the late change and the continuous change.It is concluded that some unreasonable land use patterns in Wuzhong City have led to a reduction of ecological land and a large-scale expansion of construction land is the important reason for the decline of ecosystem services values.