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→Nutrient sources
==Nutrient sources==
==Nutrient sources==
[[File:Sources of nitrogen.PNG|thumb|450px|A simplified diagram showing the many sources of nitrogen here, which comes in the environment.(YSI Inc./Xylem Inc. 2022).<ref>YSI Inc./Xylem Inc. 2022. How to Get Your Lab Ready for Harmful Algal Blooms. Authored by: Laboratory Team. Aug 18, 2022. Accessed 26 September 2022.https://www.ysi.com/ysi-blog/water-blogged-blog/2022/08/how-to-get-your-lab-ready-for-harmful-algal-blooms</ref>]]
The extreme amounts of nutrients are both due to the general increase of their availability and the decreased removal capacity of natural systems. Following the important technological advancements in early 20th century (Haber-Bosch process), nitrogen in the form of ammonia has increased significantly due to the ongoing production of fertilizers. While the increase in agricultural production has been a beneficial effect of this finding, it has also led to excessive amounts of nutrient source loading. The decrease in nutrient retention capacity is due to the modification of natural systems such as the increased impervious surfaces along with reduction of [[vegetation]], stream channelization and modification and degradation of riparian zones (Collins et al, 2010<ref>Collins, K.A., Lawrence, T.J., Stander, E.K., Jontos, R.J., Kaushal, S.S., Newcomer, T.A., Grimm, N.B. and Ekberg, M.L.C., 2010. Opportunities and challenges for managing nitrogen in urban stormwater: A review and synthesis. Ecological Engineering, 36(11), pp.1507-1519.</ref>).
The extreme amounts of nutrients are both due to the general increase of their availability and the decreased removal capacity of natural systems. Following the important technological advancements in early 20th century (Haber-Bosch process), nitrogen in the form of ammonia has increased significantly due to the ongoing production of fertilizers. While the increase in agricultural production has been a beneficial effect of this finding, it has also led to excessive amounts of nutrient source loading. The decrease in nutrient retention capacity is due to the modification of natural systems such as the increased impervious surfaces along with reduction of [[vegetation]], stream channelization and modification and degradation of riparian zones (Collins et al, 2010<ref>Collins, K.A., Lawrence, T.J., Stander, E.K., Jontos, R.J., Kaushal, S.S., Newcomer, T.A., Grimm, N.B. and Ekberg, M.L.C., 2010. Opportunities and challenges for managing nitrogen in urban stormwater: A review and synthesis. Ecological Engineering, 36(11), pp.1507-1519.</ref>).