Urban Ecological Risk Analysis Based on Anthropogenic Nitrogen Inputs in Shenzhen (2000–2014)

SU Yu1,2, CHANG Hsiaofei3,4, XIE Miaomiao2,†, WANG Yanglin4, SONG Zhiqing4

1. Urban Construction School, Beijing City University, Beijing 100083; 2. School of Land Science and Technology, China University of Geosciences (Beijing), Beijing 100083; 3. The Key Laboratory for Environmental and Urban Sciences, School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen 518055; 4. Laboratory for Earth Surface Processes, Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing 100871; † Corresponding author, E-mail: xiemiaomiao@cugb.edu.cn

Abstract This study proposed a framework involving the amount and change trend of anthropogenic nitrogen inputs to analyze the ecological risk of human activities. Shenzhen, the typical rapid urbanized city of China, has been chosen as the case study. Within the context of urban social and economic development, and using official statistical data, therefore resident living, agricultural and industrial production were evaluated. The land use classification and human activities had been corresponded and merged, and the temporal and spatial differences of anthropogenic nitrogen inputs in Shenzhen were obtained. The results indicate that the anthropogenic nitrogen input in Shenzhen showed a trend of first increase and then decrease. As the process of urbanization in Shenzhen stabilized, the nitrogen input from resident living decreased. From 2000 to 2014, the dominated factors of the ecological risk in Shenzhen has changed, and the influence of transportation has been increasing and needs to be paid attention. In terms of spatial distribution, the regions with relatively high ecological risks are distributed in Nanshan District, Futian District and Luohu District. In order to reduce the influence of human activities, it is suggested that industrial upgrading and green travel should be optimized at present. Key words human activities; ecological risk; nitrogen input; Shenzhen city