A typological study on the landscape characteristics of the polder fields in the Chaohu Lake Basin
Polders are areas of cultivated land that are created by enclosing shallow bodies of water with dykes and gates,and then pumping out the water to create arable land.They are commonly found along rivers,lakeshores,and coastlines,as well as in areas with a network of waterways.In the middle reaches of the Yangtze River,they are known as yuan fields,while in the lower reaches they are referred to as polders.Crop rotation in dike fields can provide multiple benefits,including improving soil fertility,promoting crop production,and optimizing water resources.Additionally,it serves as an important secondary wetland with high agrotechnical,hydrological,ecological,and cultural values.This practice exemplifies the harmonious coexistence between humans and nature.However,in current domestic and foreign farming culture and wetland protection work,there is active development.There is a slight insufficiency in polder landscape systematic research and special development planning.The Chaohu Lake Basin is considered as one of the birthplaces of China's agricultural cantonment due to its rich topography,abundant precipitation,and typical climate.The polder landscape in the area has a long history,is large in scale,and rich in features along the river to the lagoon.It has undergone many rounds of swidden cultivation,making it highly valuable for typological research.Typological research can identify the genes of polder landscape and provide a reasonable judgement for its formation and development.This paper focuses on the poldered landscape in Chaohu Lake basin.It combines the theory of landscape ecology with typology to identify the development law and spatial characteristics of the poldered landscape in the basin.The aim is to enrich the planning research related to rural revitalisation and provide references for the planning and design of the basin,as well as work related to the protection of the landscape.This paper examines the elements of the polder landscape in the Chaohu Lake Basin using landscape ecology research methods.The distribution of the polder landscape pattern in the basin as a whole is obtained.Texture analysis of the polder landscape was carried out on 34 village samples.From the perspective of typology research,three prototypes and six types of polder landscapes were identified and their distribution characteristics in the watershed space were explored.The results indicate that polders in the Chaohu Lake basin are primarily located in the plain water network and hill areas.Only a few polders are dispersed around the rivers in the mountainous area due to the high terrain,sparse river channels,and lack of environmental factors that constitute polders.Prototype 1's polder landscape has the smallest volume and is generally fragmented and distributed far from the town centre or bodies of water.The mountain and water potential form a smaller unit,resulting in a less regular boundary.Prototype 2's polder landscape has the largest volume and is continuously distributed around Chaohu Lake and along the river in most areas,with good continuity.Prototype 3's polder landscape is less voluminous and generally distributed in the area of neighbouring water bodies and towns.It is closely connected with prototype 2 and has a more regular geometric boundary.The polderscape in the Chaohu Lake Basin reflects the development possibilities of the polderscape in different periods and states.It also reveals the attributes of the distribution of the landscape pattern in the basin.By combining the succession history and distribution results of the polder landscape,the succession characteristics of the three main archetypes are obtained.Prototype 1 links natural elements and exhibits slow succession.Prototype 2 is based on settlements and watercourses,and exhibits polymorphism with varying rates of succession based on boundary elements.Prototype 3 is partially linked to natural elements and exhibits a relatively high rate of succession.Finally,this study identifies the three main factors that contribute to the stability of natural elements,the progress of agronomic production,and the pursuit of high performance in production management.Suggestions for planning and developing ecological,recreational,and composite polder landscapes are provided based on these archetypal succession factors.
polder landscapetypologylandscape patternChaohu Lake Basin
万方数据
维普
