Snowpack enhanced dissolved organic carbon export during a variety of hydrologic of events in an agricultural landscape, Midwestern USA

Qiao, Huijiao; Tian, Yong Q.; Yu, Qian; Carrick, Hunter J.; Francek, Mark; Li, Jiwei

doi:10.1016/j.agrformet.2017.06.002

Cited by 19 publications

(16 citation statements)

References 56 publications

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“…Some earlier studies report larger DOC concentrations for spring than autumn, since the freshet Q magnitude is larger than that of autumn (e.g. Guo et al, 2012;Qiao et al, 2017). It has been suggested that agricultural residues breakdown under the snowpack and intensify DOC flushing during snowmelt (Qiao et al, 2017).…”

Section: Interannual and Seasonal Water Quality Variationmentioning

confidence: 98%

High-frequency monitoring reveals seasonal and event-scale water quality variation in a temporally frozen river

Kämäri

Tattari

Lotsari

et al. 2018

Journal of Hydrology

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Potential influences of climate change on water quality, riverine suspended sediments, nitrogen and organic matter loads in temporally frozen rivers, which have ice-covered flow and snow-affected basins, are poorly understood. However, before being able to understand potential future changes, the impact of ice and snow needs to be investigated more thoroughly for years which were hydrologically different. We investigated seasonal and event scale concentration-discharge (C-Q) dynamics of total suspended solids/turbidity, nitrate-N (NO 3-N) and chemical oxygen demand (COD), which is indicative of the amount of organic matter in river water. In particular, the influence of ice cover, contrasting spring thaw, and soil frost conditions on intra-annual fluxes and the C-Q response of the three solutes are detected based on over four years of hourly data. Seasonally flow-weighted suspended solids and NO 3-N concentrations were at their highest in either the autumn or spring thaw, but COD concentrations were the highest each year in autumn. NO 3-N and COD levels typically decreased during winter. The ice-covered river water was less turbid compared to open-channel water at an equivalent river discharge likely due to in-stream factors. Storms during the freshet period introduced flushing of organic matter and suspended solids. The ratio of organic matter yield to water yield was similar each freshet and was independent of the amount of precipitation as snow or soil frost status. The freshet NO 3-N yield per water yield was higher during the years with a thick snowpack and the consequent thawed soil compared to a year with soil frost and minor snowpack. 91 storm events studied revealed differences and similarities in storm 2 dynamics in between the three variables. Anticlockwise hysteresis was most common for the variables, with turbidity peaking faster than the COD or NO 3-N concentration in most of the storms. Snowmelt storms showed highly variable C-Q responses inbetween the variables. However, spring thaw-related COD concentration peaks abated more slowly compared to turbidity or NO 3-N. NO 3-N showed a strong dilution pattern during several autumn storms during an extremely wet year, indicating limited N sources for flushing from the catchment. As a result, the flow-weighted mean NO 3-N concentration was not the largest during the year of largest water yield instead which was true for suspended solids and COD. We found no evidence that warmer winters with precipitation as rain instead of snow would increase suspended sediment, organic matter and NO 3-N load at entire winter-spring season or annual timescales.

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Section: Interannual and Seasonal Water Quality Variationmentioning

confidence: 98%

High-frequency monitoring reveals seasonal and event-scale water quality variation in a temporally frozen river

Kämäri

Tattari

Lotsari

et al. 2018

Journal of Hydrology

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“…Moreover, significant correlations between the a CDOM (440) and DOC concentration were obtained in the AP and NP, with r values of 0.68 and 0.44, respectively. Linear relationships between DOC and CDOM are usually observed during short periods or single seasons without significant temperature variations (Li, Yu, Tian, & Boutt, ; Qiao et al, ). DOC and CDOM would have a strong relationship only if the CDOM and uncoloured dissolved organic matter (UDOM) covaried.…”

Section: Results and Analysismentioning

confidence: 99%

“…The amounts of precipitation and runoff inordinately increased the exogenous inputs and changed the CDOM and UDOM ratio. This change resulted in a weaker relationship in the AP than in the NP, which also indicated that hydrological changes significantly affected the relationship between CDOM and DOC (Li et al, ; Qiao et al, ).…”

Section: Results and Analysismentioning

confidence: 99%

Seasonal dynamics of light absorption by suspended particulate matter and CDOM in highly turbid inland rivers on the Loess Plateau, China

Shao

Wang

Liang

et al. 2019

River Research & Apps

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The spectral characteristics of optically active constituents in water are key parameters in bio-optical modelling. Light absorption by phytoplankton [a ph (λ)], nonalgal particles (NAPs) [a NAP (λ)], and chromophoric dissolved organic matter (CDOM)[a CDOM (λ)] was investigated at 28 sites in the Wuding River (WDR) during the abundant river flow period (AP) in July 2017 and the normal river flow period (NP) in May 2018. The water quality parameters in the WDR substantially differed between the AP and NP. The dissolved organic carbon and turbidity were high in the NP, and chlorophyll a (Chl-a), total suspended matter (TSM), dissolved oxygen concentrations and electrical conductivity were low in the AP. a p (675) and Chl-a were more strongly correlated in the NP (r=0.96) than in the AP (r=0.41). a NAP (440) and a NAP (675) were strongly correlated with TSM (r=0.98 and 0.97) in the AP but weakly correlated in the NP. Moreover, a ph (λ) was positively correlated with Chl-a in both the AP and NP. In addition, a CDOM (440) was significantly correlated with Chl-a (r=0.62, p<.001) in the NP but not the AP. TSM was weakly correlated with a CDOM (440) in both the AP and NP. The S 275-295 values in the NP (0.0147-0.020 nm -1 ) were lower than those in the AP, demonstrating that the molecular weights were higher in the AP than in the NP. The photosynthetically active radiation absorption of most samples was dominated by the NAPs and CDOM, implying a crucial role in light attenuation in highly turbid inland rivers on the Loess Plateau.

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“…This extended model was shown to effectively model DOC concentration dynamics in the Chippewa River watershed, USA (Qiao et al, 2017). We considered it also effective in describing POC/DOC concentration dynamics in Riganqiao peatland.…”

Section: The Weibull Distribution and Statistical Approachesmentioning

confidence: 99%

Organic Carbon Flux in Ditches during the Growing Season in a Drained Alpine Peatland

Wang

et al. 2019

Ecohydrology

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The carbon budget dynamics of peatlands plays a crucial role in both the response of peatland ecosystems to environmental change and the effect of environmental change on peatlands. Studies on northern peatlands have suggested that the reliable assessment of the carbon budget must include the carbon flux at the land-stream interface. But this argument has not been proved in the Qinghai-Tibet Plateau, the world's largest alpine system. To address the knowledge gap, in the growing season (May to October) of 2016, we chose Riganqiao peatland, a typical peatland in the Zoige Basin of the Qinghai-Tibet Plateau which has been intensely drained via ditches since the 1960s. The objective of this study was to measure the organic carbon export from ditches, and to estimate what proportion of the carbon budget can be attributed to this export. Results showed that, during the growing season in 2016, total organic carbon flux in ditches was 2,345 t (8.6 g m −2 ), of which particulate organic carbon accounted for 12% and dissolved organic carbon for 88%. This flux decreased the carbon budget of Riganqiao peatland by 11.2% (from +76.8 g m −2 to +68.2 g m −2 ), making it a weakened carbon sink. This result revealed that organic carbon export from ditches plays an important role in the carbon balance in peatland of the Qinghai-Tibet Plateau.

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Snowpack enhanced dissolved organic carbon export during a variety of hydrologic of events in an agricultural landscape, Midwestern USA

Cited by 19 publications

References 56 publications

High-frequency monitoring reveals seasonal and event-scale water quality variation in a temporally frozen river

High-frequency monitoring reveals seasonal and event-scale water quality variation in a temporally frozen river

Seasonal dynamics of light absorption by suspended particulate matter and CDOM in highly turbid inland rivers on the Loess Plateau, China

Organic Carbon Flux in Ditches during the Growing Season in a Drained Alpine Peatland

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