Riverine dissolved organic matter (DOM) as affected by urbanization gradient

Zhang, Liuqing; Xu, Y. Jun; Li, Siyue

doi:10.1016/j.envres.2022.113457

Cited by 25 publications

(10 citation statements)

References 49 publications

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“…The Yangtze River Basin, as one of the most developed regions in China, has experienced rapid economic growth and intensive urbanization over the past three decades (Zhong et al, 2017). The expansion of urban areas and impervious surfaces have led to elevated C concentrations in the Yangtze River (Zhang, Xu, & Li, 2022c) (see Table S6; Figure S21), in agreement with findings in other subtropical streams (Chelsea Nagy et al, 2012; das Neves Lopes et al, 2020). Point source pollution, such as wastewater inputs that are enriched in organic C, also largely alter river chemistry (e.g., pH, chemical oxygen demand, see Methods).…”

Section: Discussionsupporting

confidence: 81%

“…The alternative hypothesis of soil organic C content, temperature‐dependent DOC decomposition, and water residence time as drivers of the production and delivery of riverine DOC has also been proposed (Li et al, 2019). Recently, the significance of the impacts of anthropogenic activities on riverine DOC has been demonstrated (He et al, 2019; Liu et al, 2020; Liu, Tian, et al, 2022), especially for headwater streams (Zhang, Xu, & Li, 2022b). For example, Liu et al (2020) estimated changes in the total annual F DOC of mainland China during 1953–2016 with a model forced by precipitation and population density (Liu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Increasing riverine export of dissolved organic carbon from China

Yan

Lauerwald

Wang

et al. 2023

Global Change Biology

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River transport of dissolved organic carbon (DOC) to the ocean is a crucial but poorly quantified regional carbon cycle component. Large uncertainties remaining on the riverine DOC export from China, as well as its trend and drivers of change, have challenged the reconciliation between atmosphere-based and land-based estimates of China's land carbon sink. Here, we harmonized a large database of riverine in-situ measurements and applied a random forest model, to quantify riverine DOC fluxes (F DOC ) and DOC concentrations (C DOC ) in rivers across China. This study proposes the first DOC modeling effort capable of reproducing well the magnitude of riverine C DOC and F DOC , as well as its trends, on a monthly scale and with a much wider spatial distribution over China compared to previous studies that mainly focused on annual-scale estimates and large rivers. Results show that over the period 2001-2015, the average C DOC was 2.25 ± 0.45 mg/L and average F DOC was 4.04 ± 1.02 Tg/year. Simultaneously, we found a significant increase in F DOC (+0.044 Tg/year 2 , p = .01), but little change in C DOC (−0.001 mg/L/year, p > .10). Although the trend in C DOC is not significant at the country scale, it is significantly increasing in the Yangtze River Basin and Huaihe River Basin (0.005 and 0.013 mg/L/year, p < .05) while significantly decreasing in the Yellow River Basin and Southwest Rivers Basin (−0.043 and −0.014 mg/L/year, p = .01). Changes in hydrology, play a stronger role than direct impacts of anthropogenic activities in determining the spatio-temporal variability of F DOC and C DOC across China. However, and in contrast with other basins, the significant increase in C DOC in the Yangtze River Basin and Huaihe River Basin is attributable to direct anthropogenic activities. Given the dominance of hydrology in driving F DOC , the increase in F DOC is likely to continue under the projected increase in river discharge over China resulting from a future wetter climate.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Increasing riverine export of dissolved organic carbon from China

Yan

Lauerwald

Wang

et al. 2023

Global Change Biology

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“…Thus, we suggest the importance of riverbanks in the conservation of water quality, and riverbank restoration strategies to improve water quality. Furthermore, human land uses largely regulate biogeochemical process of dissolved organic carbon (Zhang et al, 2022), and clearly increase aquatic greenhouse gases emission (Tang et al, 2021;Gu et al, 2022). Land use planning and landscape strategy is the core of reduction of pollution and carbon emission.…”

Section: Implication Of Land Use and Landscape Studies For Water Qual...mentioning

confidence: 99%

“…Land use/land cover (including land use compositions, configurations and intensity) has been proved to largely regulate riverine water quality through altering sediment, nutrient loads, and catchment hydrology (e.g., Peterjohn and Correll, 1984;Basnyat et al, 1999;Turner and Rabalais, 2003), because rivers are receivers and integrators of terrestrial materials (Zhou et al, 2012), consequently are reflective to water-land interactions. Current studies also concentrate on land use influences on riverine carbon geochemical process (Gu et al, 2022;Zhang et al, 2022;Zhang et al, 2023). Previous studies relating to influences of land use composition on riverine water quality usually adopted the proportion of land use composition rather than their actual area (i.e., Ye et al, 2009;de Mello et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Linking land use with riverine water quality: A multi-spatial scale analysis relating to various riparian strips

Zhang

Jiang

et al. 2022

Front. Environ. Sci.

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Exploring linkages between riverine water quality and land use is of great importance for catchment management and water quality conservation. Relationships between them are complex and site-specific. Therefore, land-use/landscape effects on water quality remain to be investigated. Multivariate statistics and empirical models are used to examine the influences of seasonality (wet and dry seasons), land use in various riparian strips, on water quality seasonality in the river networks of the Three Gorges Reservoir Area. Redundancy analysis (RDA) shows a comparable effect of land use on overall water quality (OWQ) during the two seasons. The variance of OWQ explained is generally higher in the 50 m riparian zone, whilst, the variance is higher along 200 m riparian in the wet season with land use composition presented as actual area. The explanatory variables of land use indices for the OWQ are quite distinct. Multiple linear regression (MLR) modeling indicates that models of water quality parameters (WQPs) depend on seasonality, riparian zone and representation of land use indices (calculated from percentage and actual area), this results in predictor variables of WQPs are highly variable. Land use within the 50 m riparian zone can predict WQPs well, and land use along the riparian zones predicts WQPs better in the dry season. We firstly compared the impacts of multi-riparian land use indices (presented as percentage and actual area) in combination with land use configuration on water quality. Our study provides critical information for efficiently land-use planning to protect water quality.

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“…With the rapid expansion of urbanization, the number of urban population has increased sharply, and the utilization and consumption of water resources have also rapidly increased. A series of problems such as deterioration of water quality, degradation of aquatic ecology, and deterioration of the surrounding environment of water bodies have emerged, posing a serious threat to water ecology (Khamis et al, 2018;Zhang et al, 2022a;He et al, 2022). Rivers are the important carriers for the transportation and transformation of dissolved organic matter (DOM), playing an important role in global and regional carbon cycles (Ni et al, 2019;Li et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of spatio-temporal distribution and source differences of DOM in urban watersheds of Xi'an during the dry, normal and wet periods

Yang,

Zhao,

et al. 2023

Preprint

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The spatio-temporal distribution characteristics of the fluorescence components, molecular properties, source of DOM in water bodies of Xi'an during dry, normal and wet period were investigated by using three-dimensional fluorescence spectroscopy combined with parallel factor analysis, and UV spectroscopy. The results showed that the order of the mean DOC values of water bodies was: normal period > dry period > wet period, and the mean values of UV254 and α355 of DOM were the highest in wet period, with the mean values of 0.137 ± 0.043 cm− 1 and 7.69 ± 2.62 m− 1, respectively, indicating the content of aromatic compounds and the relative content of CDOM were higher. The DOM in wet and dry periods was humus-like dominant, while the proportion of humus-like and protein-like substances in normal period was close. The sources of DOM were mainly dominated by endogenous sources in dry period, and the proportion of exogenous sources in the DOM increased in normal and wet period. COD, IMn, DOC, UV254, α355, fluorescence intensity of peak D and fluorescence intensity of peak E exhibited significantly positive correlations with each other(r = 0.594–0.975, P < 0.01). The humification degree of the Zaohe River DOM increased along the water flow direction, while the humification degree of the Juehe River DOM decreased and its autogenous characteristics enhanced. The Heihe River was the least biologically active during dry and normal period, and more humified than other water bodies in normal and wet period. The composition, molecular properties and sources of DOM show spatio-temporal heterogeneity. In each period, the DOM contained at least two types of humus-like substances with fulvic acid being dominated. UV254, α355, fluorescence intensity of peak D, fluorescence intensity of peak E could indirectly represent the relative content of DOM, and COD, IMn in the water bodies, which could provide basis for the protection and restoration of the water ecology of urban watersheds.

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Riverine dissolved organic matter (DOM) as affected by urbanization gradient

Cited by 25 publications

References 49 publications

Increasing riverine export of dissolved organic carbon from China

Increasing riverine export of dissolved organic carbon from China

Linking land use with riverine water quality: A multi-spatial scale analysis relating to various riparian strips

Characteristics of spatio-temporal distribution and source differences of DOM in urban watersheds of Xi'an during the dry, normal and wet periods

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