【摘要】 巢湖流域是我国重要的生态保护区。2021—2023年，该流域以“一湖两带八区”为核心开展山水林田湖草沙一体化保护和修复工程，对保障区域生态环境质量具有重要意义。本文采用CarnegieAmes-Stanford Approach(CASA)模型，估算巢湖流域2020—2023年的植被净初级生产力（Net Primary Productivity, NPP）的时空变化。结果表明：巢湖流域NPP空间分布呈“植被高、水域低”格局，高值区集中在西南部森林，低值区集中在湖泊水域和建筑用地；2020—2023年，流域NPP年均值与总量呈波动上升趋势。森林是NPP年均值最高、变化幅度最大的土地利用类型，而田地对NPP总量的贡献占比最大。2022年受极端高温干旱影响，NPP总量最低。不同土地利用类型和气候变化是影响巢湖流域NPP的主要因素，研究结果可为该流域可持续发展提供科学参考。更多还原

【Abstract】 The Chaohu Lake Basin is a critical ecological protection area in China.From 2021 to 2023,focusing on the "One lake,Two belts,Eight zones" framework,the basin carried out the integrated protection and restoration projects for Mountains,Rivers,forests,Farmlands,Lakes,Grasses,and Sands,which is of great significance for safeguarding the regional ecological environment quality.In this study,the improved Carnegie-Ames-Stanford Approach(CASA) model was employed to estimate the spatiotemporal variation of Net Primary Productivity(NPP) in Chaohu Lake Basin from2020 to 2023.The results show that the spatial distribution of NPP in the Chaohu Lake Basin presents a pattern of "high in vegetation areas,low in water areas",with high values areas concentrated in the southwestern forests and low values areas in lake waters and built-up lands.During 2020—2023,both the annual average and total NPP of the Basin showed a fluctuating increasing trend.Among all land use types,forests exhibited the highest annual mean NPP and the greatest variability,whereas cropland contributed the largest proportion to total NPP.Affected by extreme high temperature and drought in 2022,the total NPP reached the lowest level.Different land use types and climate change are the main factors influencing NPP in the Chaohu Lake Basin.The research results provide a scientific reference for the sustainable development in the Chaohu Lake Basin.更多还原