The effects of N, P and crude oil on the decomposition of Spartina alterniflora belowground biomass

Turner, R. Eugene; Bodker, James E.

doi:10.1007/s11273-015-9457-8

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…The influence of other factors, including: oiling characteristics [ 7 , 22 , 33 , 40 , 75 , 76 , 77 , 78 , 79 , 80 , 81 ] and treatment methods [ 36 , 82 , 83 , 84 , 85 ], environmental stressors (e.g. salinity, flooding, nutrients, predation) [ 2 , 86 , 87 , 88 ], as well as complex and interactive marsh biogeochemical processes [ 89 , 90 , 91 , 92 ] make attributing the landscape-scale progression of marsh deterioration and land loss to oiling difficult [ 43 , 93 , 94 ]. We attempt to control for the influence of these factors on land loss by calculating reach-scale background rates over the three periods between image acquisition dates.…”

Section: Discussionmentioning

confidence: 99%

Oiling accelerates loss of salt marshes, southeastern Louisiana

et al. 2017

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The 2010 BP Deepwater Horizon (DWH) oil spill damaged thousands of km2 of intertidal marsh along shorelines that had been experiencing elevated rates of erosion for decades. Yet, the contribution of marsh oiling to landscape-scale degradation and subsequent land loss has been difficult to quantify. Here, we applied advanced remote sensing techniques to map changes in marsh land cover and open water before and after oiling. We segmented the marsh shorelines into non-oiled and oiled reaches and calculated the land loss rates for each 10% increase in oil cover (e.g. 0% to >70%), to determine if land loss rates for each reach oiling category were significantly different before and after oiling. Finally, we calculated background land-loss rates to separate natural and oil-related erosion and land loss. Oiling caused significant increases in land losses, particularly along reaches of heavy oiling (>20% oil cover). For reaches with ≥20% oiling, land loss rates increased abruptly during the 2010–2013 period, and the loss rates during this period are significantly different from both the pre-oiling (p < 0.0001) and 2013–2016 post-oiling periods (p < 0.0001). The pre-oiling and 2013–2016 post-oiling periods exhibit no significant differences in land loss rates across oiled and non-oiled reaches (p = 0.557). We conclude that oiling increased land loss by more than 50%, but that land loss rates returned to background levels within 3–6 years after oiling, suggesting that oiling results in a large but temporary increase in land loss rates along the shoreline.

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Section: Discussionmentioning

confidence: 99%

Oiling accelerates loss of salt marshes, southeastern Louisiana

et al. 2017

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“…Due to runoff losses, the actual amount of nitrogen retained in the soil is lower than the amount of nitrogen applied, which may cause the amount of nitrogen retained in the soil not to reach its peak, affecting microbial biomass carbon and nitrogen, resulting in the phenomenon observed in the experiment. The response of CAT to nitrogen application is the same as the results of Tu exploring the effects of nitrogen application on the extracellular enzyme activity in bamboo forest soil [60]. According to "resource allocation theory" and the "optimal allocation principle", nitrogen application will change soil extracellular enzyme activity, and soil microorganisms alleviate nutrient limitation by increasing the production of resource-deficient enzymes.…”

Section: Effect Of Nitrogen Application On Soil Microbiota and Soil E...mentioning

confidence: 86%

Enhanced Nitrogen Fertilizer Input Alters Soil Carbon Dynamics in Moso Bamboo Forests, Impacting Particulate Organic and Mineral-Associated Carbon Pools

Chu,

Ni,

et al. 2023

Forests

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The application of nitrogen fertilizer is crucial in the cultivation of bamboo forests, and comprehending the alterations in soil organic carbon (SOC) due to nitrogen application is essential for monitoring soil quality. Predicting the dynamics of soil carbon stock involves analyzing two components: particulate organic carbon (POC) and mineral-associated organic carbon (MAOC). This study aimed to investigate the impact of high nitrogen inputs on SOC stock in Moso bamboo forests located in southwestern China. The research focused on analyzing changes in soil chemical properties, SOC content, and its components (POC and MAOC), as well as microbial biomass in the surface layer (0–10 cm) under different nitrogen applications (0, 242, 484, and 726 kg N ha−1 yr−1). The results indicate that nitrogen application significantly reduced the SOC content, while concurrently causing a significant increase in POC content and a decrease in MAOC content within the Moso bamboo forest (p < 0.05). The HM treatment notably increased the NO3−-N content to 2.15 mg/kg and decreased the NH4+-N content to 11.29 mg/kg, although it did not significantly influence the microbial biomass carbon (MBC) and nitrogen (MBN). The LN and MN treatments significantly reduced the MBC and MBN contents (71.6% and 70.8%, 62.5% and 56.8%). Nitrogen application significantly increased the Na+ concentration, with a peak observed under the LN treatment (135.94 mg/kg, p < 0.05). The MN treatment significantly increased the concentrations of Fe3+ and Al3+ (p < 0.05), whereas nitrogen application did not significantly affect Ca2+, Mg2+ concentration, and cation exchange capacity (p > 0.05). Correlation and redundancy analyses (RDAs) revealed that the increase in annual litterfall did not significantly correlate with the rise in POC, and changes in extractable cations were not significantly correlated with the decrease in MAOC. Soil nitrogen availability, MBC, and MBN were identified as the primary factors affecting POC and MAOC content. In conclusion, the application of nitrogen has a detrimental impact on the soil organic carbon (SOC) of Moso bamboo forests. Consequently, it is imperative to regulate fertilization levels in order to preserve soil quality when managing these forests. Our research offers a theoretical foundation for comprehending and forecasting alterations in soil carbon stocks within bamboo forest ecosystems, thereby bolstering the sustainable management of Moso bamboo forests.

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Mass removal efficiencies in water and consequences after a river diversion into coastal wetlands: second thoughts

et al. 2022

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Salinity control, nutrient additions, and sediment supply were directly or indirectly the rationale for a $220 million coastal wetland restoration project (Davis Pond River Diversion) that began in 2002. We sampled Mississippi River water going in and out of the receiving basin from 1999 to 2018 to understand why wetland loss increased after it began. There was a reduction in inorganic sediments, nitrogen (N), and phosphorus (P) concentrations within the ponding area of 77%, 39% and 34%, respectively, which is similar to that in other wetlands. But the average sediment accumulation of 0.6 mm year−1 inadequately balances the present-day 5.6 mm year−1 sea level rise or the 7.9 ± 0.13 mm year−1 accretion rates in these organic soils. Nutrients added likely reduced live belowground biomass and soil strength, and increased decomposition of the organic matter necessary to sustain elevations. The eutrophication of the downstream aquatic system from the diversion, principally by P additions, increased Chl a concentrations to a category of ‘poor’ water quality. We conclude that this diversion, if continued, will be a negative influence on wetland area and will eutrophy the estuary. It is a case history example for understanding the potential effects arising from proposed river diversions.

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The effects of N, P and crude oil on the decomposition of Spartina alterniflora belowground biomass

Cited by 5 publications

References 32 publications

Oiling accelerates loss of salt marshes, southeastern Louisiana

Oiling accelerates loss of salt marshes, southeastern Louisiana

Enhanced Nitrogen Fertilizer Input Alters Soil Carbon Dynamics in Moso Bamboo Forests, Impacting Particulate Organic and Mineral-Associated Carbon Pools

Mass removal efficiencies in water and consequences after a river diversion into coastal wetlands: second thoughts

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