Abstract
The 21st century is the era of rapid global urbanization. Urbanization can have severe ecological consequences because of the perturbation of the cycles of water (H2O), carbon (C), nitrogen (N) and other elements, and contamination/pollution of soil and the environment. Drastic reduction in the forest vegetation cover and soil compaction, truncation, mixing and perturbation aggravate disruption of soil functions and the attendant ecosystem disservices. Most soils of urban ecosystems are severely depleted of their soil organic carbon (SOC) reserves, and the total magnitude of the terrestrial C pool (soil plus vegetation) is drastically reduced. There are also shortages of fresh supply of vegetables, fruits and other food commodities in densely populated urban centers. These problems may be aggravated by climate change, increase in frequency and intensity of extreme events, and increase in risks of contamination of soil and eutrophication of water resources. Urban ecosystems are also a major source of greenhouse gases through consumption of energy-based services (e.g., transport, heating, cooling, infrastructure development and management). Despite numerous challenges in restoration and sustainable management of soil, water, vegetation and other natural resources, judicious management of urban soils and landscapes also provides opportunities of sequestering C in soil and vegetation, improving the environment, recycling nutrients in biowaste and gray/black water to grow food and biofuel feedstock, and developing industries focused on production of food and energy, purification of water, and production of amendments.
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Lal, R. (2019). Managing Urban Soils for Food Security and Adaptation to Climate Change. In: Vasenev, V., Dovletyarova, E., Cheng, Z., Prokof’eva, T., Morel, J., Ananyeva, N. (eds) Urbanization: Challenge and Opportunity for Soil Functions and Ecosystem Services. SUITMA 2017. Springer Geography. Springer, Cham. https://doi.org/10.1007/978-3-319-89602-1_35
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