鄱阳湖环湖区生态系统服务价值时空变化及权衡协同关系

基于修订的当量因子表，结合1988—2020年7期土地利用数据，运用GIS数据处理和空间分析等方法探究了鄱阳湖环湖区生态系统服务价值的时空演变特征，同时引入生态系统服务权衡协同度模型对食物生产、水文调节、土壤保持等7项生态服务功能进行权衡与协同分析。结果表明：① 1988—2020年鄱阳湖环湖区生态系统服务价值从577.95亿元增至592.50亿元，呈先增后减再增的波动变化特征。② 生态系统服务价值的空间分布表现为明显的不均衡性，ESV显著减少的区域为南昌市区、九江市区以及其它各区县的城镇建成区，生态系统服务价值增加的区域均匀分布在研究区东北和西北地区以及靠近研究区外侧的东南和西南地区。③ 协同关系为生态系统服务之间的主导关系，权衡关系较少且主要存在于食物生产与其他服务之间。

Temporal and Spatial Variation of Ecosystem Service Value and Its Trade-offs and Synergies in the Peripheral Region of the Poyang Lake

It is of great significance to study the temporal and spatial variation characteristics of ecosystem services value (ESV) and the trade-offs and synergies among various services to realize the coordinated development of regional ecology and economy. Based on the revised equivalent factor table and combined with the land use data of 7 periods from 1988 to 2020, the study of spatio-temporal evolution characteristics of ecosystem services value (ESV) in the peripheral region of the Poyang Lake is explored by data processing and spatial analysis of GIS technology. At the same time, the ecosystem service trade-offs and synergies model is introduced to analyze the trade-offs and synergies of seven ecosystem service functions. The results show that: 1) From 1988 to 2020, the ecosystem service value in the peripheral region of the Poyang Lake increased from 57.79 billion yuan to 59.25 billion yuan, showing the fluctuation characteristics of first increasing, then decreasing and then increasing. During the whole study period, ESV of water area is the largest, followed by woodland and arable land. The main contributing factors of ESV change are water area, grassland and woodland. From the perspective of single ecological service value, the regulation service value is the largest during the study period, accounting for more than 77% of the total ESV. 2) The spatial distribution characteristics of ecosystem service value in the study area are closely related to land use types. In recent 32 years, the spatial distribution of ecological service value in the study area has shown obvious imbalance. The area with the highest ecological service value is the area with abundant water resources, and the area with the lowest ecological service value is the contiguous area with concentrated construction land. ESV significantly decreased in areas with the greatest intensity of construction land expansion, including Nanchang urban area, Jiujiang urban area, and urban built-up areas of other districts and counties. The areas with increased ESV are evenly distributed in the northeast and northwest of the study area, as well as the southeast and southwest near the outside of the study area. 3) In the study period, the synergistic relationship is the dominant relationship among ecosystem services, while the number of the trade-off’s relationship is small and mainly existed between food production and other services. The results indicate that there is conflict between food production and environmental protection, and there is competition between cultivated land and other land use patterns in the study area. During 1988-1999 and 1999-2009, the other six ecosystem services showed synergistic relationship except for food production service. From 2009 to 2020, the degree and direction of interaction among ecosystem services have changed, and the maximum value of trade-offs and synergies have increased. The trade-offs and synergies between ecosystem services has a profound impact on the balanced development of regional ecological environment protection and economy. Moreover, trade-offs and synergies play an important role in coordinating multiple goals, maximizing human well-being and supporting the sustainable use of social-ecosystems. The research results can provide reference information for promoting the coordinated development of ecological environment protection and economy in the peripheral region of Poyang Lake.