2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 3:15 PM - 3:30 PM | THE TRADE-OFF BETWEEN NUTRIENT RELEASE AND UPTAKE OF NATIVE AND EXOTIC SUBMERGED MACROPHYTES DURING WATER LEVEL FLUCTUATIONS | 306B
THE TRADE-OFF BETWEEN NUTRIENT RELEASE AND UPTAKE OF NATIVE AND EXOTIC SUBMERGED MACROPHYTES DURING WATER LEVEL FLUCTUATIONS
Water level drawdown followed by rewetting can shift macrophytes from a nutrient sink to a source thus changing nutrient dynamics and/or causing water quality problems in shallow lakes or reservoirs. This could be a particular issue under global climate change with more frequent droughts or floods. However, there is limited research about the role of macrophytes on nutrient dynamics during water level fluctuations (WLFs). This study examined the trade-off between nutrient release and uptake of two native and exotic submerged macrophytes during WLFs. Our results showed that the nitrogen release from macrophyte decomposition could be balanced out by nitrogen uptake from the same biomass of living macrophytes, but only 40% would be balanced out for phosphorus. Cabomba caroliniana, as an invasive species in Australia, resulted in higher nutrient release and lower water column N:P ratios compared with native Hydrilla verticillata, coinciding with higher water column chlorophyll a concentrations. Desiccated sediments increased the nutrient availability after rewetting, but also the nutrient uptake ability of living macrophytes. The results of this study will provide new insights into the role of macrophytes on nutrient dynamics during WLFs, especially for the P-deficient lentic ecosystems.
- C10 Biogeochemistry
- C26 Invasive Species
- C01 Algae & C24 Eutrophication
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Presenters/Authors
Jing Lu
(), Australian Rivers Institute, jing.lu3@griffithuni.edu.au;
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Michele Burford
(), Australian Rivers Institute, Griffith University, Queensland, Australi, m.burford@griffith.edu.au;
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Stuart Bunn
(), Australian Rivers Institute, Griffith University, Australia, s.bunn@griffith.edu.au;
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