Green Roofs - Living Architecture Monitor Winter 2020 - 18
THE NITROGEN CYCLE ON GREEN ROOFS
N-Fix
Inputs
Denitrification
Plant Uptake
Plant Nutrients
Litterfall
Physicochemical Immobilization
Available Nutrients
Physicochemical Mobilization
Soil Nutrients
Microbial Uptake
Microbial Nutrients
Microbial Uptake
Mineralization
Outputs
Figure 1. Major compartments of nitrogen retention (blue boxes) and flows (black arrows) that move nitrogen between compartments and out of the roof (Outputs). By reducing fertilizer inputs (Inputs), encouraging nitrogen-fixation (N-fix), and improving the design and management of green roofs to reduce losses
of nitrogen from the roof (Outputs), we can make green roofs more sustainable. Adapted from Buffam and
Mitchell 2015 and Vitousek et al. 1998.
LIVING ARCHITECTURE MONITOR / WINTER 2020 / 18
ful in improving the fertility of
your green roof substrate while
saving you money and reducing
the potential for nitrogen pollution.
For further information,
contact Dr. Mark E. Mitchell at
mitcheme55@gmail.com.
References
Buffam I, Mitchell ME (2015)
Nutrient cycling in green roof
ecosystems. In: Sutton R (ed)
Green roof ecosystems. Springer,
New York, pp 107-138
Vitousek P, Hedin L, Matson
P, Fownes J, Neff J (1998)
Within-system element cycles,
input- output budgets, and nutrient limitation. In: Pace M, Groffman P (eds) Successes, limitations,
and frontiers in ecosystem science.
Springer, New York, pp 432-451
LIVINGARCHITECTUREMONITOR.COM
https://www.soprema.ca/
Green Roofs - Living Architecture Monitor Winter 2020
Table of Contents for the Digital Edition of Green Roofs - Living Architecture Monitor Winter 2020
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Green Roofs - Living Architecture Monitor Winter 2020 - IP
Green Roofs - Living Architecture Monitor Winter 2020 - Cover1
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Green Roofs - Living Architecture Monitor Winter 2020 - Table of Contents
Green Roofs - Living Architecture Monitor Winter 2020 - AD1
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