【摘要】 【目的】水作为重要的农业资源,在农作物种植、水产养殖等方面起着重要的作用,因此了解研究区域生态系统中自然环境因素和人类活动对水体变化的综合影响,能为同类地区合理利用地表水体资源提供借鉴。【方法】选取多年同期Landsat系列影像为主要信息源,依据水体信息遥感提取结果,采用空间变化强度指数和区域重心模型等,对南京市水体面积的时空变化特征进行分析,在此基础上,基于多因子回归分析法,结合高分辨率影像验证,对南京市不同时期的水域变化主要影响因素进行分析。【结果】1990—2018年,南京市的水域分布重心持续南移,水体面积总体上呈扩大发展态势,但在此期间,由于气候变化、城市用地扩张和水产养殖业发展等因素的影响,南京市水域面积表现出阶段性增减的波动特征,尤其是1994年因为降水严重偏少等引发的干旱,导致当年该市水域面积降到了近30年来最低水平;此后,包括溧水和高淳两县在内的南京市以南地区,由于水产养殖规模扩大,越来越多的农田被开挖成鱼塘,这是南京市水域分布重心不断向南移动的主要原因。更多还原

【Abstract】 [Purpose]As an important agricultural resource,water plays an important role in crop planting and aquaculture.Therefore,it is necessary to understand the natural environmental factors in the study area ecosystem and the comprehensive impact of human activities on water changes,and provide reasonable use of surface water resources for similar areas learn from the role.[Method]In order to deeply explore the spatial trajectory of water in Nanjing City and its genesis on a large scale,Landsat images in the same quarter of multiple years are selected as the main information source.Based on the remote sensing extraction of water body information,the spatial intensity index and regional center of gravity are adopted in analysis on the spatial and temporal variation characteristics of water area in Nanjing.Based on this,multi-factor regression analysis and high-resolution image verification were applied to identify the influencing factors of water changes in Nanjing.[Result]The results show that the water area in Nanjing City during the period of1990—2018 has expanded and been at a relationally stable but up-and-down trend with influences from climate change,urban expansion and aquaculture development,Especially due to severe drought caused by severe precipitation in 1994,the city’s water area decreased to the lowest level in nearly 30 years;thereafter,with the large-scale aquaculture’s advance in two counties of Lishui and Gaochun in the south Nanjing City,a lot of farmland has been transformed into fish ponds,which therefore caused the gravity center of water distribution in Nanjing to move southward.更多还原