Poyang Lake Basin is an important agricultural production area in China and a globally important wetland reserve. Ecosystem services of this region play a pivotal role in China's and even the global sustainable deve-lopment. Studying the responses of trade-offs and synergies of ecosystem services to the regional land-use changes in Poyang Lake Basin is of great significance in guiding the management of national land space, and in enhancing ecosystem services. We used the InVEST model to quantitatively assess carbon storage service (CSS), food provisioning service (GP) and water purification service (SWP) of Poyang Lake Basin in 2000, 2010 and 2020. Two sampling transects, i.e., transect 1 and 2, were delineated for the main terrain of plains and hills in the basin. Based on this, we used wavelet coherence analysis to measure the trade-offs and synergies between several ecosystem services, and applied linear regression to identify their responses to land use changes in Poyang Lake Basin. The results showed that, in the transect 1 and transect 2, the proportion of samples with positive correlation between CSS and SWP in 2000, 2010, 2020 were 82.3% and 92.9%, 79.0% and 94.8%, 91.2% and 94.1%, respectively, showing synergistic relationship, the proportion of samples with negative correlation between CSS and GP were 86.8% and 96.8%, 81.0% and 96.7%, 76.0% and 92.5%, and the sample proportion of negative correlation between SWP and GP were 80.5% and 91.5%, 80.9% and 91.9%, 100% and 99.8%, respectively, which showed a trade-off relationship. In the plains, woodlands had the strongest influence on ecosystem service trade-offs and synergies, with wavelet coherence means of -0.54, -0.77, and 0.62 for CSS and GP, SWP and GP, and CSS and SWP, respectively. In hilly areas, unutilized land had the strongest impact on the synergistic relationship between CSS and SWP with a wavelet coherence mean of 0.84, and built-up land had the greatest impact on the trade-off relationship between CSS and GP, and SWP and GP with wavelet coherence means of -0.79 and -0.72, respectively. The response of ecosystem service trade-off/synergistic relationship to land use conflict was not significant. In the plain area, the synergistic relationship between CSS and SWP was negatively correlated with land use intensity, and the trade-off relationship between CSS and GP, and SWP and GP was positively correlated with land use intensity. The pattern in the hilly area was the opposite to the plain area. The protection of ecosystem services and spatial control of land in Poyang Lake Basin should be managed according to different land types.
鄱阳湖流域是我国重要的农产品生产区和全球重要的湿地保护区,其生态系统服务对我国乃至全球可持续发展有举足轻重的作用,研究鄱阳湖流域生态系统服务权衡/协同关系对区域土地利用变化的响应,对引导鄱阳湖流域国土空间管理、提升生态系统服务水平有重要指导意义。本研究运用InVEST模型对鄱阳湖流域2000、2010和2020年的碳储存服务(CSS)、粮食供给服务(GP)和水质净化服务(SWP)进行量化评估。针对该流域主要地形平原和丘陵划定两条样带,分别为样带1和样带2。基于此,采用小波相干分析方法度量几种生态系统服务间的权衡/协同关系,并运用线性回归方法识别鄱阳湖流域生态系统服务权衡/协同关系对土地利用变化的响应。结果表明: 在样带1和2中,2000、2010、2020年CSS与SWP间正相关的样本占比分别为82.3%和92.9%、79.0%和94.8%、91.2%和94.1%,呈现协同关系;CSS与GP间负相关样本占比分别为86.8%和96.8%、81.0%和96.7%、76.0%和92.5%,SWP与GP间负相关样本占比分别为80.5%和91.5%、80.9%和91.9%、100%和99.8%,均呈权衡关系。在平原地区,林地对生态系统服务权衡/协同关系的影响最大,林地CSS与GP、SWP与GP、CSS与SWP的小波相干均值分别为-0.54、-0.77、0.62;在丘陵地区,未利用地对CSS与SWP协同关系的影响最大,小波相干均值为0.84,建设用地对CSS与GP、SWP与GP的权衡关系影响最大,小波相干均值分别为-0.79、-0.72。生态系统服务权衡/协同关系对土地利用冲突的响应不显著。在平原地区,CSS与SWP的协同关系与土地利用强度呈负相关,CSS与GP、SWP与GP的权衡关系与土地利用强度呈正相关,而丘陵地区与平原地区相反。鄱阳湖流域生态系统服务保护和国土空间管控应当针对不同地类采取差异化管理。.
Keywords: Poyang Lake Basin; ecosystem service; land use; trade-offs and synergies; wavelet coherence.