scholarly journals Comparison of spatiotemporal carbon, nitrogen and phosphorus burial in two plateau lacustrine sediments: Implication for N and P control

2021 ◽  
Author(s):  
Xiaolei Wang ◽  
Hao Yang ◽  
Bin Xue ◽  
Mingli Zhang ◽  
Benjun Yang ◽  
...  
Keyword(s):  
Trophic Level ◽  
Lacustrine Sediments ◽  
Evolutionary Process ◽  
Carbon Accumulation ◽  
Maximum Depth ◽  
Molar Ratio ◽  
Nitrogen Accumulation ◽  
Accumulation Rates ◽  
Nitrogen And Phosphorus ◽  
Limit Transition

Abstract The long-term accumulation, burial and release of nutrients, such as carbon (C), nitrogen (N) and phosphorus (P) in lacustrine sediments are responsible for the global lake eutrophication. Interpretation of the spatiotemporal sedimentary record of nutrients (C, N and P) in contrasting trophic level of lakes is helpful for understanding the evolutionary process of water eutrophication. Based on the radiochronology of 210Pbex and 137Cs, a comparative study of spatial and temporal concentrations, burial of total organic carbon (TOC), total nitrogen (TN) and total phosphorus (TP), the sources of organic matter were conducted using sediment cores from two plateau lakes Dianchi (DC) and Fuxian (FX) of SW China. Results showed that concentrations and burial of C, N and P in sediments of DC, a shallow hypertrophic lake with the maximum depth of 5.8 m, were both higher than those in FX, an oligotrophic deep lake with the maximum depth of 155.0 m. For both lakes the molar ratio of TOC/TN increased in the sediments moving from north to south. The values of TOC/TN molar ratios increased over time in DC and was higher than in FX. The extremely high values of TOC/TN appeared in the central and southern parts of FX, indicating the impacts of accumulation effect and sediment focusing in the deeper region and indirect supplement from the Lake Xingyun (XY), an adjoining lake connected with FX via the Gehe River. Time-integrated sources identification in DC indicated the contribution of allochthonous sources was dominant over the past few decades, which contributed to the increased trophic level of the lake. The comparison of relationships of carbon accumulation rates (CAR), nitrogen accumulation rates (NAR) and phosphorous accumulation rates (PAR), the ratios of N/P and the utilizations of N and P fertilizer between DC and FX implied that both of N and P inputs should be limited for reducing the trophic level, but N control was predominant in comparison with P for both lakes. The results indicated that caution is required in plateau lakes to limit transition from oligotrophic to eutrophic in these lakes.

Carbon accumulation rates recorded in the last 150 years in tropical high mountain peatlands of the Atlantic Rainforest, SE - Brazil

2017 ◽  
Vol 579 ◽  
pp. 439-446 ◽  
Author(s):  
Lúcio F. Lourençato ◽  
Pedro P. Caldeira ◽  
Marcelo C. Bernardes ◽  
Andressa C. Buch ◽  
Daniel C. Teixeira ◽  
...  
Keyword(s):  
Carbon Accumulation ◽  
Atlantic Rainforest ◽  
High Mountain ◽  
Accumulation Rates ◽  
Se Brazil ◽  
Carbon Accumulation Rates ◽  
Mountain Peatlands

scholarly journals Sediment and carbon accumulation in a glacial lake in Chukotka (Arctic Siberia) during the Late Pleistocene and Holocene: combining hydroacoustic profiling and down-core analyses

2021 ◽  
Vol 18 (16) ◽  
pp. 4791-4816
Author(s):  
Stuart A. Vyse ◽  
Ulrike Herzschuh ◽  
Gregor Pfalz ◽  
Lyudmila A. Pestryakova ◽  
Bernhard Diekmann ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Sediment Core ◽  
Boreal Lakes ◽  
Carbon Accumulation ◽  
Carbon Budgets ◽  
Accumulation Rates ◽  
Glacial Lakes ◽  
Organic Carbon Pool ◽  
Arctic Siberia

Abstract. Lakes act as important sinks for inorganic and organic sediment components. However, investigations of sedimentary carbon budgets within glacial lakes are currently absent from Arctic Siberia. The aim of this paper is to provide the first reconstruction of accumulation rates, sediment and carbon budgets from a lacustrine sediment core from Lake Rauchuagytgyn, Chukotka (Arctic Siberia). We combined multiple sediment biogeochemical and sedimentological parameters from a radiocarbon-dated 6.5 m sediment core with lake basin hydroacoustic data to derive sediment stratigraphy, sediment volumes and infill budgets. Our results distinguished three principal sediment and carbon accumulation regimes that could be identified across all measured environmental proxies including early Marine Isotope Stage 2 (MIS2) (ca. 29–23.4 ka cal BP), mid-MIS2–early MIS1 (ca. 23.4–11.69 ka cal BP) and the Holocene (ca. 11.69–present). Estimated organic carbon accumulation rates (OCARs) were higher within Holocene sediments (average 3.53 g OC m−2 a−1) than Pleistocene sediments (average 1.08 g OC m−2 a−1) and are similar to those calculated for boreal lakes from Quebec and Finland and Lake Baikal but significantly lower than Siberian thermokarst lakes and Alberta glacial lakes. Using a bootstrapping approach, we estimated the total organic carbon pool to be 0.26 ± 0.02 Mt and a total sediment pool of 25.7 ± 1.71 Mt within a hydroacoustically derived sediment volume of ca. 32 990 557 m3. The total organic carbon pool is substantially smaller than Alaskan yedoma, thermokarst lake sediments and Alberta glacial lakes but shares similarities with Finnish boreal lakes. Temporal variability in sediment and carbon accumulation dynamics at Lake Rauchuagytgyn is controlled predominantly by palaeoclimate variation that regulates lake ice-cover dynamics and catchment glacial, fluvial and permafrost processes through time. These processes, in turn, affect catchment and within-lake primary productivity as well as catchment soil development. Spatial differences compared to other lake systems at a trans-regional scale likely relate to the high-latitude, mountainous location of Lake Rauchuagytgyn.

scholarly journals Factors Influencing Carbon Stocks and Accumulation Rates in Eelgrass Meadows Across New England, USA

2020 ◽  
Vol 43 (8) ◽  
pp. 2076-2091 ◽  
Author(s):  
A. B. Novak ◽  
M. C. Pelletier ◽  
P. Colarusso ◽  
J. Simpson ◽  
M. N. Gutierrez ◽  
...  
Keyword(s):  
Grain Size ◽  
New England ◽  
Structural Characteristics ◽  
Sediment Cores ◽  
Carbon Stocks ◽  
Carbon Accumulation ◽  
Accumulation Rates ◽  
Seagrass Meadows ◽  
Terrestrial Habitats ◽  
C And N

Abstract Increasing the protection of coastal vegetated ecosystems has been suggested as one strategy to compensate for increasing carbon dioxide (CO2) in the atmosphere as the capacity of these habitats to sequester and store carbon exceeds that of terrestrial habitats. Seagrasses are a group of foundation species that grow in shallow coastal and estuarine systems and have an exceptional ability to sequester and store large quantities of carbon in biomass and, particularly, in sediments. However, carbon stocks (Corg stocks) and carbon accumulation rates (Corg accumulation) in seagrass meadows are highly variable both spatially and temporally, making it difficult to extrapolate this strategy to areas where information is lacking. In this study, Corg stocks and Corg accumulation were determined at 11 eelgrass meadows across New England, representing a range of eutrophication and exposure conditions. In addition, the environmental factors and structural characteristics of meadows related to variation in Corg stocks were identified. The objectives were accomplished by assessing stable isotopes of δ13C and δ15N as well as %C and %N in plant tissues and sediments, measuring grain size and 210Pb of sediment cores, and through assessing site exposure. Variability in Corg stocks in seagrass meadows is well predicted using commonly measured environmental variables such as grain size distribution. This study allows incorporation of data and insights for the northwest Atlantic, where few studies on carbon sequestration by seagrasses have been conducted.

scholarly journals Modeling Organic Carbon Accumulation Rates and Residence Times in Coastal Vegetated Ecosystems

2019 ◽  
Vol 124 (11) ◽  
pp. 3652-3671 ◽  
Author(s):  
E. Fay Belshe ◽  
Jose Sanjuan ◽  
Carmen Leiva‐Dueñas ◽  
Nerea Piñeiro‐Juncal ◽  
Oscar Serrano ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Accumulation ◽  
Residence Times ◽  
Accumulation Rates ◽  
Carbon Accumulation Rates

scholarly journals Soil organic carbon accumulation rates on Mediterranean abandoned agricultural lands

2021 ◽  
Vol 759 ◽  
pp. 143535
Author(s):  
Stephen M. Bell ◽  
César Terrer ◽  
Carles Barriocanal ◽  
Robert B. Jackson ◽  
Antoni Rosell-Melé
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Carbon Accumulation ◽  
Accumulation Rates ◽  
Agricultural Lands ◽  
Carbon Accumulation Rates

scholarly journals Struvite Precipitation for Sustainable Recovery of Nitrogen and Phosphorus from Anaerobic Digestion Effluents of Swine Manure

2020 ◽  
Vol 12 (20) ◽  
pp. 8574 ◽  
Author(s):  
Hong-Duck Ryu ◽  
Do Young Lim ◽  
Sun-Jung Kim ◽  
Un-Il Baek ◽  
Eu Gene Chung ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Biological Treatment ◽  
Swine Manure ◽  
Molar Ratio ◽  
Optimal Conditions ◽  
Nitrogen And Phosphorus ◽  
Treatment Facilities ◽  
Struvite Precipitation ◽  
Major Factors ◽  
Sustainable Recovery

In this study, we propose the application of struvite precipitation for the sustainable recovery of nitrogen (N) and phosphorus (P) from anaerobic digestion (AD) effluents derived from swine manure. The optimal conditions for four major factors that affect the recovery of N and P were derived by conducting batch experiments on AD effluents obtained from four AD facilities. The optimal conditions were a pH of 10.0, NH4-N:Mg:PO4-P molar ratio of 1:1.4:1, mixing intensity of 240 s−1, and mixing duration of 2 min. Under these optimal conditions, the removal efficiencies of NH4-N and PO4-P were approximately 74% and 83%, respectively, whereas those of Cu and Zn were approximately 74% and 79%, respectively. Herein, a model for swine manure treatment that incorporates AD, struvite precipitation, and biological treatment processes is proposed. We applied this model to 85 public biological treatment facilities in South Korea and recovered 4722 and 51 tons/yr of NH4-N and PO4-P, respectively. The economic analysis of the proposed model’s performance predicts a lack of profitability due to the high cost of chemicals; however, this analysis does not consider the resulting protection of the hydrological environment. Field-scale studies should be conducted in future to prove the effectiveness of the model.

Sign in / Sign up

Export Citation Format

Share Document