Studies of land use/cover change (LUCC) and its impact on sediment retention services (SRS) can provide references for governments to aid them in identifying priorities for conservation or development. We analysed the LUCC characteristics of the Three Gorges Reservoir area (TGRA) and their impact on SRS for the period from the end of the 1970s to 2015 using the Sediment Delivery Ratio model of the Integrated Valuation of Ecosystem Services and Tradeoffs, and we further explored the relationship between SRS and economic growth. Our major findings were as follows. (a) Expansion of construction land and waterbodies with gross rates of 9.245% and 0.950%, respectively, and conversion from cropland to forestland/grassland with an area of 41,379 ha constitute the three main LUCC characteristics in the TGRA. (b) The amount of sediment retention was stable at about 1.42 × 10⁶ t ha⁻¹yr⁻¹ from the end of the 1970s to 2015, with a decrease of <1%. Spatially, ecological programmes resulted in an increase in SRS in the central areas of the TGRA, and urbanization undermined the capacity of SRS supply in the Chongqing urban centres. (c) SRS was concentrated in regions with an altitude of 500–2,200 m. As the slope increased, the percentage of grids with high SRS increased dramatically. (d) Stable SRS and rapid economic growth co-occurred in TGRA from the end of the 1970s to 2015, which offers a positive reference for achieving sustainable development.

中文翻译：

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1970年代末至2015年，三峡水库区保沙稳定，经济快速增长

土地利用/覆盖变化 (LUCC) 及其对沉积物保留服务 (SRS) 的影响的研究可为政府提供参考，以帮助他们确定保护或开发的优先事项。我们使用生态系统服务和权衡综合评估的沉积物输送率模型分析了 1970 年代末至 2015 年期间三峡水库区 (TGRA) 的 LUCC 特征及其对 SRS 的影响，并进一步探索了SRS与经济增长的关系。我们的主要发现如下。(a) 建设用地和水体总扩张率分别为 9.245%和 0.950%，耕地转为林地/草地面积 41,379 公顷，构成了 TGRA 的三个主要 LUCC 特征。⁶  t ha ^-1 yr ^-1从 1970 年代末到 2015 年，减少 <1%。在空间上，生态项目导致了TGRA 中心地区的SRS 增加，而城市化破坏了重庆城市中心的SRS 供应能力。(c) SRS 集中在海拔 500-2,200 m 的地区。随着斜率的增加，具有高 SRS 的网格的百分比急剧增加。(d) 1970 年代末至 2015 年，TGRA 稳定的 SRS 和快速的经济增长并存，为实现可持续发展提供了积极的参考。