基于价值—风险的黄河上游生态功能区生态分区建设

黄河上游地区生态环境脆弱,水土流失和土地退化等生态环境问题不断威胁着生态系统健康与人居环境质量。为探究黄河上游生态功能区生态环境安全状况,本文基于2000年、2010年和2018年的土地利用数据,借助生态系统服务模型、生态风险模型,定量分析了生态系统服务价值和生态风险指数的时空演变规律,并通过Z-score标准化的方法建设了四类生态分区。结果表明：（1）研究期内,各土地利用类型均发生不同程度变化,其中建设用地由于耕地和草地的转入增加最显著,增长面积为118 km²,增长率为46.36%。（2）研究区总体服务价值变化程度较小,生态系统服务以调节服务为主且草地提供价值最高。高服务价值区主要分布于临夏州西南部和卓尼县等植被覆盖度较高的地区。（3）研究区生态风险水平总体偏低,整体呈现“南北两端高、中间低”的分布特征,其中低、较低生态风险区占总面积的76%以上。（4）四类生态分区均发生了较小的变化,表明生态分区处于较为稳定的发展状态。不同生态分区的空间分布连续性差,其中以高生态系统服务价值—高生态风险区（I）最为典型。通过生态系统服务与生态风险（价值—风险）建设生态分区,可为协调区域人地关系与明确未来发展方向提供理论基础。

Construction of ecological zone based on value-risk ecological function area in the Upper Yellow River

The ecological environment in the upper reaches of the Yellow River is fragile,and ecological and environmental problems such as soil erosion and land degradation continue to threaten the health of the ecosystem and the quality of human settlements.In order to explore the safety status of the ecological environment in the ecological function area in the upper reaches of the Yellow River,this article quantitatively analyzed the spatio-temporal distribution of ecosystem service value and ecological risk index based on land use data in 2000,2010 and2018,with the help of ecosystem service models and ecological risk models,and built four types of ecological divisions through z-score standardized methods.The results show that:(1)During the study period,various land use types changed to varying degrees.Among them,construction land increased most significantly due to the transfer of cultivated land and grassland,with an increase area of 118 km2 and a growth rate of 46.36%.(2)The overall service value of the study area has a small degree of change,the ecosystem services are mainly regulating services and the grassland provides the highest value.High service value areas are mainly distributed in areas with high vegetation coverage such as the southwestern part of Linxia prefecture and Zhuoni county.(3)The ecological risk level of the study area is generally low,showing the characteristics of"high in the north and south,but low in the middle".The low and low ecological risk areas account for more than 76%of the total area.(4)Little changes have taken place in the four types of ecological zoning,indicating that the ecological zoning is in a relatively stable state of development.The continuity of the spatial distribution of different ecological zones is poor,among which high ecosystem service value-high ecological risk area(I)is the most typical.Constructing ecological zoning through ecosystem services and ecological risks(value-risk)can provide a theoretical basis for coordinating the relationship between humans and land in the region and clarifying future development directions.