We investigated the spatial distribution （horizontal and vertical concentrations） of copper （Cu）, lead （Pb）, zinc （Zn）, and cadmium （Cd） in five wetland types （mudflat, aquaculture wetland, water area, farm...We investigated the spatial distribution （horizontal and vertical concentrations） of copper （Cu）, lead （Pb）, zinc （Zn）, and cadmium （Cd） in five wetland types （mudflat, aquaculture wetland, water area, farmland wetland and mangrove） from three areas （Ningde, Fuding, and Xiapu）, China. Cu concentrations in five wetland types descended in the order： farm wetland, mudflat, aquaculture, water area and mangrove. Pb concentrations decreased in the order： aquaculture, mangrove, farm wetland, mudflat, and water area. Zn content decreased in the order： farm wetland, water area, aquaculture, mudflat and mangrove, and Cd content decreased as follows： mangrove, aquacul- ture, water area, rnudflat, and farm wetland. Comparison of the concentrations of the same heavy metals in different areas showed that the highest Cu （63.75 mg kg-1） and Zn （152.32mgkg-1） concentrations occurred in Ningdecoastal wetlands; Pb （110.58 mg kg-1） and Cd （2.81 mg kg-1） contents were highest in Fuding wetlands, and the average contents of all heavy metals were very low in Xiapu wetlands. Examination of the vertical distribution showed that the Cu content was high in all mudflat layers; Pb and Cd concentrations were highest in aquaculture and mangrove wetlands, respectively, and Zn content was highest in farm wetlands. The spatial distribution of Cu and Zn contents for different areas decreased as follows： Ningde 〉 Fuding 〉 Xiapu, for Pb and Cd were most concentrated in Fuding coastal wetlands. Concentrations of Zn and Cu were highly correlated, while Zn and Cu were not significantly correlated with Pb.展开更多
Based on the analysis on the current situation of marine fishery resources and development in Ningde City,this paper plans a spatial pattern for the integration of marine fishery and tourism of the“one belt,three zon...Based on the analysis on the current situation of marine fishery resources and development in Ningde City,this paper plans a spatial pattern for the integration of marine fishery and tourism of the“one belt,three zones,and multiple points”,designs key projects,analyzes the existing problems in the integrated development of fishery and tourism,and proposes relevant countermeasures and suggestions.展开更多
The agglomeration of the rural e-commerce industry represented by Taobao villages has reshaped the existing urban and rural spatial organization and proposed a new urbanization model.This study identified the spatiote...The agglomeration of the rural e-commerce industry represented by Taobao villages has reshaped the existing urban and rural spatial organization and proposed a new urbanization model.This study identified the spatiotemporal characteristics of Taobao villages in Quanzhou city and built panel regression models to examine the impact of these villages on urbanization level,which is measured via nighttime light(NTL).The results show that(1)while the number of Taobao villages in Quanzhou city has increased rapidly,it has also experienced sporadic growth and monocentric agglomeration,finally forming a polycentric agglomeration pattern;(2) Taobao villages display a significant near-city tendency,and the urbanization level of towns with Taobao villages is higher than that of towns without Taobao villages;(3) the panel regression model highlights that Taobao villages have a significant positive impact on urbanization level.Taobao villages near the city exhibit a greater effect;meanwhile,those that are far away from the city cannot improve their urbanization level unless they reach a considerable degree of agglomeration.Rural e-commerce will become an important direction for the transformation of urban fringe areas,which provides a certain reference for the development of new urbanization in China.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.31370624)Key Financing Project of Fujian Provincial Department of Science and Technology(2009N0009)
文摘We investigated the spatial distribution （horizontal and vertical concentrations） of copper （Cu）, lead （Pb）, zinc （Zn）, and cadmium （Cd） in five wetland types （mudflat, aquaculture wetland, water area, farmland wetland and mangrove） from three areas （Ningde, Fuding, and Xiapu）, China. Cu concentrations in five wetland types descended in the order： farm wetland, mudflat, aquaculture, water area and mangrove. Pb concentrations decreased in the order： aquaculture, mangrove, farm wetland, mudflat, and water area. Zn content decreased in the order： farm wetland, water area, aquaculture, mudflat and mangrove, and Cd content decreased as follows： mangrove, aquacul- ture, water area, rnudflat, and farm wetland. Comparison of the concentrations of the same heavy metals in different areas showed that the highest Cu （63.75 mg kg-1） and Zn （152.32mgkg-1） concentrations occurred in Ningdecoastal wetlands; Pb （110.58 mg kg-1） and Cd （2.81 mg kg-1） contents were highest in Fuding wetlands, and the average contents of all heavy metals were very low in Xiapu wetlands. Examination of the vertical distribution showed that the Cu content was high in all mudflat layers; Pb and Cd concentrations were highest in aquaculture and mangrove wetlands, respectively, and Zn content was highest in farm wetlands. The spatial distribution of Cu and Zn contents for different areas decreased as follows： Ningde 〉 Fuding 〉 Xiapu, for Pb and Cd were most concentrated in Fuding coastal wetlands. Concentrations of Zn and Cu were highly correlated, while Zn and Cu were not significantly correlated with Pb.
基金Sponsored by Innovation Strategy Research Project of Fujian Provincial Department of Science and Technology(2023R0068)“East Fujian Tourism Poverty Alleviation Research Center”Project of Humanities and Social Sciences Research Base of Fujian Provincial Department of Education(Minjiaoke[2019]32)Survey and Research on the Construction Resources of Beautiful Countryside in East Fujian under the Guidance of“the Spirit of the 20th National Congress of the Communist Party of China”at Ningde Normal University(2022DZX08)。
文摘Based on the analysis on the current situation of marine fishery resources and development in Ningde City,this paper plans a spatial pattern for the integration of marine fishery and tourism of the“one belt,three zones,and multiple points”,designs key projects,analyzes the existing problems in the integrated development of fishery and tourism,and proposes relevant countermeasures and suggestions.
基金National Natural Science Foundation of China,No.41901146, No.42171207, No.42271254。
文摘The agglomeration of the rural e-commerce industry represented by Taobao villages has reshaped the existing urban and rural spatial organization and proposed a new urbanization model.This study identified the spatiotemporal characteristics of Taobao villages in Quanzhou city and built panel regression models to examine the impact of these villages on urbanization level,which is measured via nighttime light(NTL).The results show that(1)while the number of Taobao villages in Quanzhou city has increased rapidly,it has also experienced sporadic growth and monocentric agglomeration,finally forming a polycentric agglomeration pattern;(2) Taobao villages display a significant near-city tendency,and the urbanization level of towns with Taobao villages is higher than that of towns without Taobao villages;(3) the panel regression model highlights that Taobao villages have a significant positive impact on urbanization level.Taobao villages near the city exhibit a greater effect;meanwhile,those that are far away from the city cannot improve their urbanization level unless they reach a considerable degree of agglomeration.Rural e-commerce will become an important direction for the transformation of urban fringe areas,which provides a certain reference for the development of new urbanization in China.
