Influence of water-level fluctuation duration and magnitude on sediment–water nutrient exchange in coastal wetlands

Steinman, Alan D.; Ogdahl, Mary E.; Weinert, Maggie E.; Uzarski, Donald G

doi:10.1007/s10452-014-9472-5

Cited by 30 publications

(13 citation statements)

References 51 publications

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“…The TN concentration was consistent with the mean TN for the whole of China, whereas TP concentration was marginally larger than the mean TP for China. Seasonal flooding in Dongting Lake might promote mineral accumulation (such as Fe) in the saturated zone, which might in turn inhibit the release of soil P, which accords with previous studies (Bai et al, 2017;Steinman, Ogdahl, Weinert, & Uzarski, 2014). The C:N, C:P and N:P ratios recorded in this study were larger than those obtained in the Yellow River Delta (Zhang, Song, Lu, & Xue, 2013).…”

Section: Discussionsupporting

confidence: 91%

Spatial distribution and stoichiometry of soil carbon, nitrogen and phosphorus along an elevation gradient in a wetland in China

Feng

Xie

et al. 2019

European J Soil Science

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Despite extensive studies on how environmental factors influence plant nutrient distribution and stoichiometry, it remains unclear how elevation affects soil distribution and stoichiometry. Here, patterns of the spatial distribution and stoichiometry of soil carbon (C), nitrogen (N) and phosphorus (P) were studied (with 123 soil samples) along a small‐scale elevation gradient in the wetland of East Dongting Lake, China. Plant nutrient concentrations (C, N and P), soil stoichiometry (C:N, C:P and N:P ratios) and their relations with other soil properties were analysed. In addition, the spatial distributions of plant nutrient concentrations and stoichiometry were evaluated geostatistically with regression kriging, entailing estimation of regression parameters by generalized least squares and ordinary kriging of the residuals. Soil C, N and P concentrations and stoichiometry had moderate to strong spatial dependence, and the ratios of C:P and N:P had similar patterns of distribution to soil organic carbon (SOC) and total nitrogen (TN). The SOC, TN, C:N, C:P and N:P ratios increased with increasing elevation, whereas total phosphorus (TP) showed no marked change. Furthermore, SOC, TN, C:N, C:P and N:P decreased considerably with increasing duration of submergence, soil moisture and pH. Therefore, elevation appeared to influence the distribution of plant nutrients and stoichiometry as a result of changing soil moisture and duration of submergence. Highlights Study showed how elevation influences plant nutrient distribution and stoichiometry. Regression kriging was used to map soil properties. Plant nutrients and stoichiometry decreased with increasing duration of submergence. Elevation affected nutrient distribution because of soil moisture and water regime.

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Section: Discussionsupporting

confidence: 91%

Spatial distribution and stoichiometry of soil carbon, nitrogen and phosphorus along an elevation gradient in a wetland in China

Feng

Xie

et al. 2019

European J Soil Science

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“…In addition, our study site is oligotrophic, but if we investigate a nutrient-enriched aquatic ecosystem, it is likely that the amount of nitrogen and phosphorus released may be even higher [61]. Beyond the quantity of nutrients in the sediments, other factors may influence these nutrient releases, such as the history of drying and rewetting events, the exposure time to air during the dry period, sediment properties and microbial community metabolism [41,54,56,57,62].…”

Section: Rewetting-related Release Of Nitrogen and Phosphorusmentioning

confidence: 99%

Sediment drying-rewetting cycles enhance greenhouse gas emissions, nutrient and trace element release, and promote water cytogenotoxicity

et al. 2020

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“…The "Birch effect" describes a rapid release of inorganic nitrogen and carbon dioxide after rewetting dried sediments (Birch, 1958;Wilson & Baldwin, 2008). Previous studies have shown that most of the nutrient release occurs in the littoral zone, where there is higher organic matter content in sediments (Steinman, Ogdahl, Weinert, & Uzarski, 2014). Submerged macrophytes represent an important pool of organic matter and nutrients in the littoral zone.…”

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confidence: 99%

Macrophyte beds in a subtropical reservoir shifted from a nutrient sink to a source after drying then rewetting

et al. 2017

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Macrophytes play a key role in assimilating and storing nutrients in shallow aquatic ecosystems, but their capacity to act as a long‐term nutrient sink can be affected by water level fluctuations. Water level drawdown in reservoirs followed by rewetting may mobilise a significant nutrient pool. These nutrients can be stored in the littoral zone in dead or dormant macrophytes, and in the desiccated sediments within the macrophyte beds. However, the contribution of desiccated macrophyte beds to nutrient release upon rewetting has not been well quantified. Our study examined the effect of rewetting the previously desiccated waterlily Nymphoides indica (Menyanthaceae) in treatments (1) without sediments (N.i.−Sed), and (2) with sediments in N. indica beds (N.i.+Sed) on water quality. We found that longer drying duration increased dissolved nutrients (nitrate/nitrite, ammonium and total dissolved organic nitrogen/phosphorus) and organic carbon release from N.i.+Sed and N.i.−Sed treatments after rewetting. In the N.i.+Sed treatment with <4 weeks of desiccation, all N. indica plants regenerated from roots after subsequent rewetting. In addition, the resulting nutrient/carbon release was not significantly different to the control treatment which did not have desiccation. A significant increase in dissolved nutrient and carbon concentrations in the water column was found in treatments with more than 10 weeks of desiccation followed by rewetting. This coincided with the sediment reaching its minimum moisture content. Furthermore, chlorophyll a (Chl‐a) concentrations in the overlying water also increased with more than 10 weeks of desiccation, presumably in response to the increased nutrient availability and the removal of competition for nutrients from macrophytes. On the basis of our laboratory experiments, we calculated the potential effect of desiccated and rewetted N. indica beds on water quality in a local N. indica‐dominated reservoir after water level drawdown. We also separated the contribution of N. indica plants from their macrophyte beds on water quality changes. Fourteen days after rewetting, the total dissolved nutrients released from N. indica alone (N.i.−Sed) could contribute 0.5% of the total nitrogen and 29% of total phosphorus to the water column concentrations in the whole reservoir. In contrast, N. indica beds (N.i.+Sed) contributed more total dissolved nitrogen (4.3%) but less total dissolved phosphorus (0.3%) release into the water column. The higher nitrogen release for the N.i.+Sed treatment was likely due to the organic matter decomposition in the sediment in macrophyte beds. In contrast, the less dissolved phosphorus release, compared with the N. indica alone, was likely the result of phosphate adsorption by previously desiccated soil particles and/or assimilation by phytoplankton, since the phytoplankton biomass (as measured by Chl‐a concentrations) was significantly higher in the N.i.+Sed treatment. This study highlights the importance of managing both the duration and rate of water l...

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Influence of water-level fluctuation duration and magnitude on sediment–water nutrient exchange in coastal wetlands

Cited by 30 publications

References 51 publications

Spatial distribution and stoichiometry of soil carbon, nitrogen and phosphorus along an elevation gradient in a wetland in China

Spatial distribution and stoichiometry of soil carbon, nitrogen and phosphorus along an elevation gradient in a wetland in China

Sediment drying-rewetting cycles enhance greenhouse gas emissions, nutrient and trace element release, and promote water cytogenotoxicity

Macrophyte beds in a subtropical reservoir shifted from a nutrient sink to a source after drying then rewetting

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