| With the expediting process of urbanization, the problem of urban river ecological increasingly prominent, Activities in riparian zone are the important factors that affect urban river water ecological environment. Taking the Huangpu River in Shanghai as an example in this paper. Based on analysis of interpretation on the changes of landuse and landscape structure in Huangpu River riparian zone. RDA regression analysis was used to explore the landscape structure of Huangpu River riparian zone response relationship with water quality. Finally use the field investigation and interpretation of GIS analysis method to study the feature of the Huangpu River downstream riparian zone and its relationship with water and put forward some proposals for the future planning of riparian zone. The main work and conclusions of this paper are as follows:(1) By calculating the land use degree of dynamic, the transfer matrix and importance of the Huangpu River within the scope of 5000 m buffer and analyzing the chance of land use, calculate the landscape index on the landscape level and patch type level and explore the landscape pattern dynamic changes. The results show that: ① Since the urbanization, the urban construction land, industrial land and traffic land, urban green land and forest land in the Huangpu river riparian zone is in a growing while the upstream agricultural land is rapidly reduced and the water area also shrunk. Agricultural land transfers to construction land, industrial land and traffic land use.② On land use change of time and space in the Huangpu river middle and lower reaches of riparian zone within the scope of 2000 m (1965-2010), agricultural land, water area shrink while the industrial land, construction land increase. Upstream is given priority to the agricultural land and forest land, middle is given priority to the construction land and the downstream is given priority to the industrial land and construction land in 2010; ③ Human activity continuously strengthening lead to the phenomenon that the land use type continuous enrichment, spatial heterogeneity increases and kinds of landscape patches scattered distribution and aggregation in the Huangpu river riparian zone. Through nearly fifty years development, industrial land and traffic land has been the main land use types instead of the agricultural land in the middle and lower reaches of the Huangpu River riparian zone.(2) Redundancy analysis (RDA) method is used to study the relation between landscape and river water quality. In the 500 m and 1000 m,2000 m and 5000 m four scales compute 10 water quality monitoring stations in 2013-2014(DO、NH3-N、CODmn and so on) and the land use landscape variables in 2010 (PLAND、LPI、ED and PD), a total of 25 water quality monitoring stations for five years in. annual report and each year’s land use landscape variables and the explanation of regression coefficients and so on.1) Water quality in 2013-2014 (flood and non-flood season) and 2010 land use variables RDA analysis results show:① Landscape variables as the dominant factors of the Huangpu river water quality change.There are landscape parameters in each research scale have Significant effect on the water quality. ② With the increase of research scale, landscape variables also gradually increased significantly. This suggests that the landscape variables contribute more to the water quality at the regional scale than riparian scale. Industrial land, land for construction purposes in regional scale is more significant influence on water quality. Landscape variables in flood season are significantly more than in non-flood season which means that river water quality is affected by factors such as rainfall runoff. ③ Water land has significant negative effects on the Huangpu river water quality for all the research scale in flood season and non-flood season. Industrial land, construction land in the 5000 m scale relate to water quality in flood season. Industrial land in the 5000 m scale relates to water quality in non-flood season.2) Water quality of each year and the RDA analysis of land use structure variable shows: ① Landscape space variable is the dominant factor on change of the Huangpu river water quality. In 1000-2000 m scale, the interpretation of the variable of water quality spatial differentiation rate is 60-70% and 80.1% in 5000 m scale;②With the increase of research scale, landscape variables also showed a trend of increasing. In the 500 m scale, only agricultural land and water for landscape variables significantly. After the 1000 m, the road traffic land, construction land and urban green space added to the significant variables. . Landscape variable of water quality in the interpretation of the regional scale degrees than riparian zone scale; ③ In the 500 m scale, agricultural land and waters have significant positive correlation to DO with significantly negative correlation to other water quality parameters(except for TP). When the scale is larger than 1000 m, road traffic land and construction land have significant positive correlation to the main water quality parameters (TN, NH3-N, BOD5, and CODmn). The significant positive correlation that urban green space showed is still a spurious correlation. On 5000 m scale, boundary density (ED) showed a significant positive correlation to the main water quality parameters(except for DO,TP);④ Water quality data from 2013 to 2014 and the annual report data of water quality on the RDA analysis results are basically identical:Landscape variable’s contribution to the water quality change plays a main role. Effect of area to the change of water quality is larger than the riparian zone. Landscape variables and the correlation to water quality change are basically identical. For example, agricultural land and water area was positively correlated to DO, industrial land and construction land on water quality parameters such as TN, NH3-N, and CODmn are negatively correlated.(3)Taking The Huangpu River downstream as a study, through field investigation, GIS analysis and other research methods, summarizes and analyze the feature of the Huangpu River downstream riparian zone and the main existing problems, and planning for future riparian zone is also proposed.1) Through summarizing the downstream feature of riparian zone, conclusions are as follows:① A large number of industrial, municipal and other land use occupy public resources of downstream riparian zone, which leads to the weakness of the public openness. Hard of riparian zone increase the migration of pollutants into rivers; ② Because of the state that the vegetation buffer is invaded, the riparian zone lacks a continuous strip of vegetation which can filter pollutants and protect the ecological; ③ The utilization level of downstream riparian zone with predominantly industrial, wharf and warehouse is low. The function transformation is the development direction of the future.2) Suggestions for future planning:① In the planning of downstream riparian zone for the future, leave room for the flood channels, viewing platform, vegetation buffer to format the riparian zone of flood control and safety, environment friendly, function optimization; ② After planning implementation, replacement of space outside the flood channel dedicate construction horizontal continuous vegetation buffer(longitudinal dimension:50-200m); ③ In the industrial structure adjustment, industrial enterprise transfer except the necessary municipal facilities and industrial. Transfer the original riparian zone which gives priority to the transportation, warehouse wharf, and industrial enterprises to the comprehensive service functions including the finance trade, modern industry and ecological living. |
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