EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/20/2019 | 9:30 AM - 9:45 AM | VARIABLE INUNDATION PATTERNS, WETLAND PLANT COMMUNITIES, AND NITROGEN UPTAKE IN THE SALT RIVER WETLANDS | 253 AB
VARIABLE INUNDATION PATTERNS, WETLAND PLANT COMMUNITIES, AND NITROGEN UPTAKE IN THE SALT RIVER WETLANDS
Arid urban wetlands remove nitrogen from runoff through denitrification and plant uptake. Wetland nitrogen removal efficiency is influenced by environmental conditions and plant community composition, processes, and interactions, which all fluctuate significantly within and between years in arid urban systems. Therefore, nitrogen removal may depend on complex interactions between community composition and environmental conditions. Recent work found species-specific differences in nitrogen retention and biomass accumulation that varied over time and as a function of species interactions. We asked, how do plant community interactions vary as a function of water conditions in an arid urban wetland, and how does this variation affect nitrogen uptake? We approached these complex interactions between environmental context, plant community, and nitrogen removal using a combination of plant tissue chemistry and vegetation and water surveys of accidental urban wetlands in Phoenix, Arizona. We found significant intra-annual variation in hydrology that were unrelated to storm events but correlated with change in the wetland plant community composition and abundance, including shifts in dominance between Ludwigia peploides and Typha domingensis in perennial sites following sustained wetness, and the sudden death of substantial Typha domingensis stands following drying of intermittent sites.
- Biogeochemistry
- Macrophyte
- Nitrogen
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Presenters/Authors
Marina Lauck
(), Arizona State University, mlauck1@asu.edu;
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Nancy Grimm
(), Arizona State University, nbgrimm@asu.edu;
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