Phosphorus and nitrogen legacy in a restoration wetland, Upper Klamath Lake, Oregon

Carpenter, Kurt D.; Snyder, Daniel T.; Lee, Karl K.; Avanzino, Ronald J.; Triska, Frank J.

doi:10.1672/08-129.1

Cited by 30 publications

(28 citation statements)

References 22 publications

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“…1, YT as an example), which is similar to findings reported 295 by Duff et al (2009). A t-test of six tested wetlands for each sampling date showed 296 that significant differences in P concentrations of overlying water between warmed 297 and control treatments were mainly found on Jul-16 (p = 0.049 for TP and p = 0.042 298 for DRP) and Nov-16 (p = 0.033 for TP and p = 0.023 for DRP), suggesting a greater 299 influence of experimental warming on P concentrations of overlying water in wetland 300 columns occurred under the extreme temperature conditions.…”

Section: Phosphorus Budgets and Statistical Analysis 241supporting

confidence: 88%

Phosphorus fluxes at the sediment–water interface in subtropical wetlands subjected to experimental warming: A microcosm study

Wang¹,

Holden

Spera

et al. 2013

Chemosphere

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Global warming is increasingly challenging for wetland ecological function. A 22 temperature controlled microcosm system was developed to simulate climate change 23 scenarios of an ambient temperature (control) and an elevated temperature (+5 ℃). 24The effects and associated mechanisms of warming on phosphorus (P) fluxes at the 25 sediment-water interface of six subtropical wetlands were investigated. The results 26 indicated that P fluxes were generally enhanced under the experimental warming as 27 measured by higher P concentrations in the porewater and overlying water as well as 28 higher benthic P fluxes. The release of P from sediment to porewater occurred more 29 strongly and quickly in response to experimental warming compared to the 30 subsequent upward transfer into overlying water. The average accumulative benthic P 31 output from the tested wetlands under the experimental warming was greater by 12.9 32 g cm -2 y -1 (28%) for total P and 8.26 g cm -2 y -1 (25%) for dissolved reactive P, 33 compared to the ambient scenarios. Under warming the redistribution of P fractions in 34 sediments occurred with greater NH 4 Cl-P and lower BD-P (extracted by a bicarbonate 35 buffered dithionite solution) accompanied by greater NaOH-P. The higher temperature 36 enhanced total phospholipid fatty acids. A shift in the microbial community was also 37 observed with a relative dominance of fungi (a 4.7% increase) and a relative decline 38 (by 18%) in bacterial abundance, leading to the higher secretion of phosphatase. 39Comparing between wetlands, the potential P fluxes in the nutrient-enriched wetlands 40 were less impacted by warming than the other wetland types investigated. Thus 41 wetlands characterized by low or medium concentrations of P in sediments were more 42 susceptible to warming compared to P-rich wetlands. 43

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Section: Phosphorus Budgets and Statistical Analysis 241supporting

confidence: 88%

Phosphorus fluxes at the sediment–water interface in subtropical wetlands subjected to experimental warming: A microcosm study

Wang¹,

Holden

Spera

et al. 2013

Chemosphere

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“…The shape of hydrographs suggests that water in the Nabugabo system drains over a broad front from the west to the east towards Lake Victoria and this is supported by the topographic gradient. Water cycle is important for nutrient and mineral cycling in the wetland by creating the wet and dry cycles (Duff et al, 2009;Fennessy et al, 2008;Poulin et al, 2009). …”

Section: Discussionmentioning

confidence: 99%

“…Several studies have demonstrated wetlands as important ecosystems for nutrient cycling (Duff et al, 2009;Fennessy et al, 2008;Parray et al, 2010;Siraj et al, 2010) and also explained their importance in controlling nutrient availability to lakes (Duff et al, 2009;Mitsch and Gossenlink, 2007;Poulin et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Seasonal change that cause dry conditions shifts the redox status resulting in oxidation of complex organic compounds into soluble compounds including organic acids, NH4+,NO3-and soluble reactive Phosphorus (Mitsch and Gossenlink, 2007). The subsequent re-wetting during rainy season ultimately affects nutrient cycling and nutrient status of adjacent receiving waters (Duff et al, 2009;Poulin et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Being in a highly leached catchment this wetland would be important to the adjacent Lake ecosystem for minerals and nutrients. Seasonal events like rainfall and flooding are known to influence nutrient and mineral concentrations in the environment promoting recycling and also in some cases by either dilution or inputs (Agbaire and Obi, 2009;Duff et al, 2009;Poulin et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

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Seasonal physicochemical variation in the Nabugabo wetland

Okot-Okumu¹

2011

International Journal of Biological and Chemical Sciences

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The study determined physicochemical characteristics of Lake Nabugabo wetland during a wet and a dry season to evaluate season variation in water quality. Standard (APHA 1992) and HACH methods were used to determine the physicochemical parameters for a period of one seasonal cycle. Results were pH 3.8 (3.0-4.2); temperature 23.0 (19.4 -26.4) 0 C; conductivity 20. Nitrate-nitrogen and dissolved oxygen varied significantly (P<0.05), while phosphorus variation was weak (P=0.2) and both were higher during the rainy season. Temperature, pH, conductivity and the cations exhibited non-significant (P>0.05) variation with season. The wetland hydroperiods were 0.83 north of Lake Nabugabo and 0.58 south of the Lake. Seasonal variations of nitrogen and phosphorus concentrations were strongly linked to rainfall and hydroperiods. The study showed that the wetland water quality varies with season which is important for designing temporal sampling strategy and the understanding of wetland influence on adjacent open water bodies.

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Changes in benthic nutrient sources within a wetland after hydrologic reconnection

Kuwabara

Topping

Carter

et al. 2012

Enviro Toxic and Chemistry

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Removing dams and levees to restore hydrologic connectivity and enhance ecosystem services such as nutrient removal has been an increasingly common management practice. In the present study, the authors assessed geochemical and biological changes following engineered levee breaches that reconnected eutrophic Upper Klamath Lake and Agency Lake, Oregon, USA, to an adjacent, historic wetland that had been under agricultural use for the last seven decades. Over the three-year study, the reconnected wetland served as a benthic source for both macronutrients (dissolved organic carbon [DOC], soluble reactive phosphorus [SRP], and ammonia) and micronutrients (dissolved iron and manganese). The magnitude of those benthic sources was similar to or greater than that of allochthonous sources. The highest DOC benthic flux to the water column occurred immediately after rewetting occurred. It then decreased during the present study to levels more similar to the adjacent lake. Dissolved ammonia fluxes, initially negative after the levee breaches, became consistently positive through the remainder of the study. Nitrate fluxes, also initially negative, became negligible two years after the levee breaches. In contrast to previous laboratory studies, SRP fluxes remained positive, as did fluxes of dissolved iron and manganese. Our results indicate that the timescales of chemical changes following hydrologic reconnection of wetlands are solute-specific and in some cases extend for multiple years beyond the reconnection event. During the present study, colonization of the reconnected wetlands by aquatic benthic invertebrates gradually generated assemblages similar to those in a nearby wetland refuge and provided further evidence of the multiyear transition of this area to permanent aquatic habitat. Such timescales should be considered when developing water-quality management strategies to achieve wetland-restoration goals.

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Phosphorus and nitrogen legacy in a restoration wetland, Upper Klamath Lake, Oregon

Cited by 30 publications

References 22 publications

Phosphorus fluxes at the sediment–water interface in subtropical wetlands subjected to experimental warming: A microcosm study

Phosphorus fluxes at the sediment–water interface in subtropical wetlands subjected to experimental warming: A microcosm study

Seasonal physicochemical variation in the Nabugabo wetland

Changes in benthic nutrient sources within a wetland after hydrologic reconnection

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