基于人地关系视角的鄱阳湖水陆交错带范围划分

水陆交错带是典型的过渡性地理空间，是地理学研究的关键样带，承载着特殊且复杂的人地关系。根据鄱阳湖过水性、吞吐型、季节性特点，考虑行政区划完整性与尺度效应，基于高分辨率遥感影像和长时间序列水位变化数据，利用非监督分类、目视解译、调查验证等方法，从自然和行政区划两个维度划分了鄱阳湖水陆交错带的地域范围，阐述了其自然、经济和社会等基本特征，分析了其理论基础、现实意义及科学内涵。研究表明：(1)鄱阳湖水陆交错带最大自然范围约为2508.08 km~2,行政范围涉及11个县(市、区)78个乡镇单元，包含行政村974个；(2)其景观要素变化多样，经济发展主要以生态农业、生态旅游业为主，人口分布呈现带状特征，与交错带范围高度吻合；(3)自然基础、尺度效应和内涵特征是其范围划分的理论基础，探究其人与环境相互作用的过程、机理与规律是重要现实意义；(4)未来可以从景观格局变化、人地关系分解、社会生活变迁等方面开展进一步研究，以揭示该区域特殊人地关系变化。

Scope division of the aquatic-terrestrial ecotone of Poyang Lake from the perspective of human-land relationship

The aquatic-terrestrial ecotone is a typically transitional geographic space, carrying a special and complex relationship between human and land. As the research progresses, the aquatic-terrestrial ecotone has become one of the major concerns affecting human-land relationship. According to the overwater, throughput and seasonal characteristics of Poyang Lake, the integrity of administrative division and scale effect are considered. Based on high-resolution remote sensing images and long time series water level change data, unsupervised classification, visual interpretation and survey verification are used. Delineating the geographical scope of the aquatic-terrestrial ecotone of Poyang Lake in two dimensions, natural and administrative divisions, and elaborating its basic characteristics, such as natural, economic and social. The theoretical basis, practical significance and scientific content were analyzed. The result shows that:(1) the maximum natural range of aquatic-terrestrial ecotone of Poyang Lake is 2508.08 km². As the water level changes, its range also changes. The administrative range involves 78 township units in 11 counties (cities and districts), including 974 administrative villages; among them, 40 are in Jiujiang City, 20 are in Nanchang City, and 18 are in Shangrao City. (2) The landscape elements are varied, such as water bodies, grass beaches, soft mud, hard mud, and sandy beaches. The economic development is mainly based on ecological agriculture and ecological tourism, and the population distribution shows band features, which is highly consistent with the range of ecotone. From county scale, the population density of Lushan City, Duchang County, Poyang County and the newly built districts is relatively high. (3) The natural basis, scale effect and connotation characteristics are the theoretical basis of the scope division. The theories include aquatic and terrestrial ecosystems, territorial systems of human-land relationship, and the coupling of nature and society. It is important to explore the process, mechanism and law of human-environment interaction. (4) Further research can be carried out in terms of landscape pattern changes and social life changes to reveal the special human-land relationship changes in this region. For instance, the impact of landscape pattern changes on human production and life, animal and plant habitats can be further simulated and investigated under different conditions. Also, future work can focus on the changes of human-land relationships at different stages to find out the main driving factors for optimal control. This research is a supplement to the previous division of aquatic-terrestrial ecotone, and it also provides a new idea and reference for the division of this type of aquatic-terrestrial ecotone.