CAS article collection: Urban Environmental Studies
Rapid urbanization in the past decades has resulted in enormous challenges on resources, ecosystem, and the environment.

Introduction:
Rapid urbanization in the past decades has resulted in enormous challenges on resources, ecosystem, and the environment. Urban ecosystem is a human dominated complex system that is continually exchanging mass, energy, and information between its dwellers and the environment (air, water, and soil). This virtual special issue reviewed those urban environmental studies contributed by CAS (Chinese Academy of Sciences) researchers to Elsevier journals in 2016. All selected papers were published in 24 Elsevier journals, covering topics on urban materials metabolism (e.g. metals, PM, or food), urban human health, and various environmental matrices (e.g. air, soil, water, and biome). The Institute of Urban Environment (IUE) was the leading academic body, contributing about 50% publications and more than 30% of scholarly interactions within the international collaborative network.
With thanks to the Article Selection Editors:
Dr. Yong-Guan Zhu is currently a professor and the Director General of the Institute of Urban Environment (IUE), Chinese Academy of Sciences (CAS). His studies focus on urban environment and environmental soil science.

Dr. Shen Yu is currently a professor at the IUE, CAS. His study focuses on watershed ecology and the environment.

Dr. Wei-Qiang Chen is a research professor leading a group on Urban Ecology and Industrial Ecology at the IUE, CAS.

Dr. Yu-Peng Liu is currently an assistant research professor at the IUE, CAS. His studies focus on urban ecology and urban big data.

Article collections
Urban Ecological Environment System
Defining and advancing a systems approach for sustainable cities Bai, X., Surveyer, A., Elmqvist, T., Gatzweiler, F.W., Güneralp, B., Parnell, S., Prieur-Richard, A.-H., Shrivastava, P., Siri, J.G., Stafford-Smith, M., Toussaint, J.-P., Webb, R.
A quantitative method to assess the ecological indicator system's effectiveness: a case study of the Ecological Province Construction Indicators of China Lin, T., Ge, R., Huang, J., Zhao, Q., Lin, J., Huang, N., Zhang, G., Li, X., Ye, H., Yin, K.
Lin, T., Sun, C., Li, X., Zhao, Q., Zhang, G., Ge, R., Ye, H., Huang, N., Yin, K.
International Journal of Applied Earth Observation and Geoinformation
Modeling the optimal ecological security pattern for guiding the urban constructed land expansions
Su, Y., Chen, X., Liao, J., Zhang, H., Wang, C., Ye, Y., Wang, Y.
The spatio-temporal patterns of urban–rural development transformation in China since 1990 Wang, Y., Liu, Y., Li, Y., Li, T.
An integrated approach for assessing the urban ecosystem health of megacities in China Zeng, C., Deng, X., Xu, S., Wang, Y., Cui, J.
Urban Land Use and Cover Change
The rapid and massive urban and industrial land expansions in China between 1990 and 2010: A CLUD-based analysis of their trajectories, patterns, and drivers Kuang, W., Liu, J., Dong, J., Chi, W., Zhang, C.
Liao, J., Tang, L., Shao, G., Su, X., Chen, D., Xu, T.
Land management institution as a key confinement of urbanization in Baotou, China: Application of proposed endogenous urbanization model Wu, Y., Dong, S., Zhai, J., Huang, D., Huang, Z.
Urban Atmospheric Environment and Pollution
Spatial distribution of dust–bound trace elements in Pakistan and their implications for human exposure Eqani, S.A.M.A.S., Kanwal, A., Bhowmik, A.K., Sohail, M., Ullah, R., Ali, S.M., Alamdar, A., Ali, N., Fasola, M., Shen, H.
Human lead (Pb) exposure via dust from different land use settings of Pakistan: A case study from two urban mountainous cities Eqani, S.A.M.A.S., Khalid, R., Bostan, N., Saqib, Z., Mohmand, J., Rehan, M., Ali, N., Katsoyiannis, I.A., Shen, H.
Potential threat of heavy metals and PAHs in PM2.5 in different urban functional areas of Beijing
Gao, Y., Guo, X., Ji, H., Li, C., Ding, H., Briki, M., Tang, L., Zhang, Y.
Variation of airborne quartz in air of Beijing during the Asia-Pacific Economic Cooperation Economic Leaders' Meeting Li, G., Li, Y., Zhang, H., Li, H., Gao, G., Zhou, Q., Gao, Y., Li, W., Sun, H., Wang, X., Zhang, Q. Journal of Environmental Sciences
Identification of chemical compositions and sources of atmospheric aerosols in Xi'an, inland China during two types of haze events Li, J., Wang, G., Ren, Y., Wang, J., Wu, C., Han, Y., Zhang, L., Cheng, C., Meng, J.
Organophosphate esters in total suspended particulates of an urban city in East China
Ren, G., Chen, Z., Feng, J., Ji, W., Zhang, J., Zheng, K., Yu, Z., Zeng, X. Chemosphere
Contribution of regional transport to the black carbon aerosol during winter haze period in Beijing Wang, Q., Huang, R.-J., Cao, J., Tie, X., Shen, Z., Zhao, S., Han, Y., Li, G., Li, Z., Ni, H., Zhou, Y., Wang, M., Chen, Y., Su, X.
Low-level environmental arsenic exposure correlates with unexplained male infertility risk
Wang, X., Zhang, J., Xu, W., Huang, Q., Liu, L., Tian, M., Xia, Y., Zhang, W., Shen, H.
Inter-annual variability of wintertime PM2.5 chemical composition in Xi'an, China: Evidences of changing source emissions Xu, H., Cao, J., Chow, J.C., Huang, R.J., Shen, Z., Chen, L.W.A., Ho, K.F., Watson, J.G.
Aerosol composition and sources during high and low pollution periods in Ningbo, China Xu, J.-S., Xu, H.-H., Xiao, H., Tong, L., Snape, C.E., Wang, C.-J., He, J. Atmospheric Research
Attributing risk burden of PM2.5-bound polycyclic aromatic hydrocarbons to major emission sources: Case study in Guangzhou, south China Yu, Q., Gao, B., Li, G., Zhang, Y., He, Q., Deng, W., Huang, Z., Ding, X., Hu, Q., Huang, Z., Wang, Y., Bi, X., Wang, X.
Response of aerosol composition to different emission scenarios in Beijing, China Zhang, Y., Sun, Y., Du, W., Wang, Q., Chen, C., Han, T., Lin, J., Zhao, J., Xu, W., Gao, J., Li, J., Fu, P., Wang, Z., Han, Y.
Urban Soil Environment
China's soil and groundwater management challenges: Lessons from the UK's experience and opportunities for China Coulon, F., Jones, K., Li, H., Hu, Q., Gao, J., Li, F., Chen, M., Zhu, Y.-G., Liu, R., Liu, M., Canning, K., Harries, N., Bardos, P., Nathanail, P., Sweeney, R., Middleton, D., Charnley, M., Randall, J., Richell, M., Howard, T., Martin, I., Spooner, S., Weeks, J., Cave, M., Yu, F., Zhang, F., Jiang, Y., Longhurst, P., Prpich, G., Bewley, R., Abra, J., Pollard, S.
National pattern for heavy metal contamination of topsoil in remote farmland impacted by haze pollution in China Luo, Z., Gao, M., Luo, X., Yan, C.
Urban Water Environment
Coulon, F., Jones, K., Li, H., Hu, Q., Gao, J., Li, F., Chen, M., Zhu, Y.-G., Liu, R., Li, W., Gao, L., Shi, Y., Wang, Y., Liu, J., Cai, Y.
The effects of mariculture on heavy metal distribution in sediments and cultured fish around the Pearl River Delta region, south China Liang, P., Wu, S.-C., Zhang, J., Cao, Y., Yu, S., Wong, M.-H.
Temporal dynamics of urbanization-driven environmental changes explored by metal contamination in surface sediments in a restoring urban wetland park Ma, J., Liu, Y., Yu, G., Li, H., Yu, S., Jiang, Y., Li, G., Lin, J.
Urban Material and Energy Metabolism
Anthropogenic arsenic cycles: A research framework and features Chen, W.-Q., Shi, Y.-L., Wu, S.-L., Zhu, Y.-G.
A hybrid method for quantifying China's nitrogen footprint during urbanisation from 1990 to 2009 Cui, S., Shi, Y., Malik, A., Lenzen, M., Gao, B., Huang, W.
Triclosan: A review on systematic risk assessment and control from the perspective of substance flow analysis Huang, C.-L., Abass, O.K., Yu, C.-P.
Water conservation significance of municipal solid waste management: a case of Xiamen in China Huang, C.-L., Yu, C.-P., Lin, T., Ye, Z.
Mass, energy, and emergy analysis of the metabolism of Macao Lei, K., Liu, L., Hu, D., Lou, I.
Quantifying and managing food-sourced nutrient metabolism in Chinese cities Lin, T., Wang, J., Bai, X., Zhang, G., Li, X., Ge, R., Ye, H.
The life cycle rebound effect of air-conditioner consumption in China Liu, J., Sun, X., Lu, B., Zhang, Y., Sun, R.
Efficiency evaluation of material and energy flows, a case study of Chinese cities Song, T., Yang, Z., Chahine, T.
Characterization of anthropogenic impacts in a large urban center by examining the spatial distribution of halogenated flame retardants Wei, Y.-L., Bao, L.-J., Wu, C.-C., Zeng, E.Y.
Does food demand and rapid urbanization growth accelerate regional nitrogen inputs? Zhang, W., Li, X., Swaney, D.P., Du, X.
Urban Green Infrastructure
Wang, H.-F., Qureshi, S., Qureshi, B.A., Qiu, J.-X., Friedman, C.R., Breuste, J., Wang, X.-K.
Elevated soil CO2 efflux at the boundaries between impervious surfaces and urban greenspaces
Wu, X., Hu, D., Ma, S., Zhang, X., Guo, Z., Gaston, K.J.
Ozone effects on photosynthesis of ornamental species suitable for urban green spaces of China
Yang, N., Wang, X., Cotrozzi, L., Chen, Y., Zheng, F.
Urban Heat Island Effect
Application of a new integrated landscape index to predict potential urban heat islands Chen, A., Zhao, X., Yao, L., Chen, L.
Quantifying the influences of various ecological factors on land surface temperature of urban forests Ren, Y., Deng, L.-Y., Zuo, S.-D., Song, X.-D., Liao, Y.-L., Xu, C.-D., Chen, Q., Hua, L.-Z., Li, Z.-W.
Urban Environmental Management and other aspects
Analysis of urban environmental problems based on big data from the urban municipal supervision and management information system Dong, R., Li, S., Zhang, Y., Zhang, N., Wang, T., Tan, X., Fu, X.
Harbin: A rust belt city revival from its strategic position Xie, L., Yang, Z., Cai, J., Cheng, Z., Wen, T., Song, T.
Multi-criteria location model of earthquake evacuation shelters to aid in urban planning
Xu, J., Yin, X., Chen, D., An, J., Nie, G.
Peri-urban agricultural development in Beijing: Varied forms, innovative practices and policy implications Yang, Z., Hao, P., Liu, W., Cai, J.
Spatial representations and policy implications of industrial co-agglomerations, a case study of Beijing Yang, Z., Song, T., Chahine, T. Habitat International
Nanjing-an ancient city rising in transitional China
Yuan, F., Gao, J., Wu, J. Cities
Subways near the subway: Rail transit and neighborhood catering businesses in Beijing Zheng, S., Hu, X., Wang, J., Wang, R.
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