Climate change impact on nutrient loading in a water supply watershed

Mukundan, Rajith; Hoang, Linh; Gelda, Rakesh K.; Yeo, Myeong‐Ho; Owens, Emmet M.

doi:10.1016/j.jhydrol.2020.124868

Cited by 21 publications

(11 citation statements)

References 41 publications

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“…S4c, S4d); Warming will likely enhance erosion rates by amplifying wet-dry cycles and flooding events (Goudie 2006;Rodeghiero et al 2011;Swain et al 2018). In relatively humid forests, increases in sediment export of nutrients with warming have also been projected to accompany increases in the frequency and magnitude of large storm events, which transport disproportionate amounts of sediments into streams (e.g., the Catskill Mountains in New York, Mukundan et al 2020).…”

Section: Stream Export Of Particulate and Dissolved Nutrients With Wa...mentioning

confidence: 99%

“…These observations suggest that stream export of dissolved nutrients may decrease with warming in Mediterranean-climate regions mainly because of longer growing seasons and thus greater evapotranspiration and reduced water yield. In contrast, in relatively humid forests, increases in annual stream export of dissolved nutrients are often observed and projected with warming (Morales-Marı ´n et al 2018; Mukundan et al 2020;Shogren et al 2020). This has been attributed to no change or moderate increases in annual water yield associated with marked increases in dissolved nutrient concentrations.…”

Section: Stream Export Of Particulate and Dissolved Nutrients With Wa...mentioning

confidence: 99%

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Impacts of climate and disturbance on nutrient fluxes and stoichiometry in mixed-conifer forests

et al. 2022

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Elucidating climatic impacts on stream nutrient export and stoichiometry will improve the understanding of forest carbon (C) storage in a warmer world. We analyzed C, nitrogen (N), and phosphorus (P) cycles in four watersheds within a rain-snow transition site and another four within a higherelevation, snow-dominated site, in California's mixed-conifer zone. We used these two sites in a space-for-time substitution to assess the potential warming impacts on nutrient cycles in currently snow-dominated areas that will become more raindominated. During a non-drought period (water year (WY) 2004-2011), mean annual stream exports of C and N in particulate forms at the transition site were twice that at the snow-dominated site, suggesting sediment-associated nutrient losses may increase with warming. The transition site had 12% lower N but twice P content in mineral horizons, lower N:P mass ratios in organic horizons, and lower stream export of dissolved inorganic N than the snow-dominated site. These differences suggest montane forests may have lower inputs of available N relative to P with warming.

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Section: Stream Export Of Particulate and Dissolved Nutrients With Wa...mentioning

confidence: 99%

Section: Stream Export Of Particulate and Dissolved Nutrients With Wa...mentioning

confidence: 99%

Impacts of climate and disturbance on nutrient fluxes and stoichiometry in mixed-conifer forests

et al. 2022

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“…Hydrological processes on land are largely controlled by climates which impact the soil P deliveries into the streams (Dudula and Randhir, 2016;Mukundan et al, 2020).…”

Section: Climate Change Scenario and Modelling Evaluationmentioning

confidence: 99%

“…Even small changes in air temperatures could have large impacts on the rainfall events and river runoffs (Pachauri et al, 2014). Intense rainfalls could intensify the mobilisation of nutrients retained in soil and increase input into the receiving waters body through runoff (Fang et al, 2020;Mukundan et al, 2020). Subsequent shift in hydrology (e.g.…”

Section: Introductionmentioning

confidence: 99%

Exploring dynamics of riverine phosphorus exports under future climate change using a process-based catchment model

Tong

Chen

Wen

et al. 2022

Journal of Hydrology

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“…In the future, the nutrient load will exacerbate significantly due to the change of land use, rainfall, and rising temperatures. A variety of studies (Teshager et al, 2016;Wagner et al, 2016;Zuo et al, 2016;Shrestha et al, 2018;Mukundan et al, 2020;Ridwansyah et al, 2020) have investigated the effect of climate or land-use change on hydrology, sediment, and non-point sources. Some findings have suggested that non-point source (NPS) pollution is more sensitive to land-use change (El-Khoury et al, 2015;Gao et al, 2017;Liang et al, 2020); land-use change, a dominant variable, has a considerable impact on the distribution of nutrient loads (Tu, 2009;Tang et al, 2011;Gao et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Exploring and Predicting the Individual, Combined, and Synergistic Impact of Land-Use Change and Climate Change on Streamflow, Sediment, and Total Phosphorus Loads

Xie

Chen

Yun-Feng

et al. 2021

Front. Environ. Sci.

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The present study predicts and assesses the individual, combined, and synergistic effect of land-use change and climate change on streamflow, sediment, and total phosphorus (TP) loads under the present and future scenarios by using the Soil and Water Assessment Tool (SWAT). To predict the impacts of climate and land-use change on streamflow, sediment, and TP loads, there are 46 scenarios composed of historical climate, baseline period climate, eight climate models of Coupled Model Intercomparison Project phase 5 (CMIP5) of two representative emission pathways (RCP4.5 and RCP8.5), after downscaled and bias-corrected, two observed land-use maps (LULC 1995, LULC 2015) and the projected two future land-use maps (LU2055 and LU 2075) with the help of CA-Markov model to be fed into SWAT. The central tendency of streamflow, sediment, and TP loads under future scenarios is represented using the annual average. The intra-/inter-annual variation of streamflow, sediment, and TP loads simulated by SWAT is also analyzed using the coefficient of variation. The results show that future land-use change has a negligible impact on annual streamflow, sediment, TP loads, and intra-annual and inter-annual variation. Climate change is likely to amplify the annual streamflow and sediment and reduce the annual TP loads, which is also expected to reduce its inter-/intra-annual variation of TP loads compared with the baseline period (2000–2019). The combined impact of land-use and climate change on streamflow, sediment, and TP loads is greater than the sum of individual impacts for climate change and land-use change, especially for TP loads. Moreover, the synergistic impact caused by the interaction of climate and land use varies with variables and is more significant for TP loads. Thus, it is necessary to consider the combined climate and land-use change scenarios in future climate change studies due to the non-negligible synergistic impact, especially for TP loads. This research rare integrates the individual/combined/synergistic impact of land-use and climate change on streamflow, sediment, and TP loads and will help to understand the interaction between climate and land-use and take effective climate change mitigation policy and land-use management policy to mitigate the non-point source pollution in the future.

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Climate change impact on nutrient loading in a water supply watershed

Cited by 21 publications

References 41 publications

Impacts of climate and disturbance on nutrient fluxes and stoichiometry in mixed-conifer forests

Impacts of climate and disturbance on nutrient fluxes and stoichiometry in mixed-conifer forests

Exploring dynamics of riverine phosphorus exports under future climate change using a process-based catchment model

Exploring and Predicting the Individual, Combined, and Synergistic Impact of Land-Use Change and Climate Change on Streamflow, Sediment, and Total Phosphorus Loads

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