Effect of landscape pattern on river water quality under different regional delineation methods: A case study of Northwest Section of the Yellow River in China

Journal of Hydrology Regional Studies, Год журнала: 2023, Номер 50, С. 101536 - 101536

Опубликована: Сен. 23, 2023

A typical arid irrigation area of the Yellow River, Ningxia, Northwest China. At present, few studies have evaluated effects nested watershed and runoff process on relationships between landscape patterns water quality. In this study, we aimed to quantify pattern river quality using two delineation methods. One method involved a monitoring site only corresponding its own sub-watershed, while other all upstream sub-watersheds. We collected data, including DO, CODMn, NH3-N, TP, TN, pH for period (May, 2021 – August, 2021) non-irrigation (December, March, 2022) seven Our results revealed that when corresponded sub-basins in process, correlations composition parameters were stronger. Additionally, degree which configuration explained overall was greater such cases. also found buffer zone scale accounted more than 97.3% variation. These highlight importance aligning sites with sub-watersheds emphasize significance land-use management riparian near River protection.

Язык: Английский

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Optimization of the N footprint model and analysis of nitrogen pollution in irrigation areas: A case study of Ningxia Hui Autonomous Region, China

Journal of Environmental Management, Год журнала: 2023, Номер 340, С. 118002 - 118002

Опубликована: Апрель 27, 2023

Язык: Английский

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Rapid urbanization decelerates regional net anthropogenic phosphorus input: Evidence from the Chengdu-Chongqing urban agglomeration in China

Journal of Environmental Management, Год журнала: 2025, Номер 374, С. 124171 - 124171

Опубликована: Янв. 19, 2025

Язык: Английский

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Microbial Metabolic Limitation in Response to Phosphorus Enrichment: Implications for Carbon Sequestration in a Nitrogen‐Enriched Desert Steppe

Land Degradation and Development, Год журнала: 2025, Номер unknown

Опубликована: Март 11, 2025

ABSTRACT The availability of nitrogen (N) and phosphorus (P) significantly influences microbial metabolism, thereby affecting soil carbon (C) sequestration. However, it remains unclear how resource limitation C turnover dynamics respond to P under elevated N loads in dryland ecosystems. To address this, we conducted a 7‐year experiment desert steppe northern China, applying gradient additions (0–16 g m −2 year −1 ) conditions loading (atmospheric deposition +5 ). Our aim was investigate nutrient limitations their impact on use efficiency (CUE) based stoichiometry theory. findings revealed that, loading, metabolism both the surface (0–10 cm) subsurface (10–20 layers topsoil limited by P. Interestingly, with increasing addition, initially increased then decreased at but remained unchanged subsurface. Under limitation, enrichment did not alleviate either layer. Surprisingly, communities maintained plastic stoichiometric homeostasis despite aggravated C:P N:P imbalances. Furthermore, CUE layers, experiencing most significant decline. Further analysis showed that factors driving varied between enrichment, enhanced strongly inhibiting CUE. study indicates due can reduce exacerbate This could potentially lead greater loss N‐enriched soils.

Язык: Английский

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Influence of long-term anthropogenic nitrogen inputs and its legacy on riverine output

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Апрель 28, 2025

The accelerated accumulation of anthropogenic nitrogen inputs and legacies (NL) is a primary driver for persistently high loads in rivers. Understanding the impact NL on river export (RNE) critical improving water quality. This study employs net input (NANI) approach coefficient model (ECM), coupled with remote sensing data, to analyze dynamics, total (TNE), from 1949 2021 China’s Dongjiang River watershed. Results indicate that NANI peaked 2017 while TNE continued grow, results show over 73 years, grew rapidly 1992, exhibited fluctuating growth 1993 2021, reached its maximum value (6743 kg·km⁻²·yr⁻¹) 2017. Meanwhile, TN output maintained continuous trend, contributing approximately 46.5% RNE 1986 2021. Despite reduced NANI, recent remain major factor TNE. Spatial analysis reveals management should prioritize agricultural practices upstream urban pollution control downstream.

Язык: Английский

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Influence of long-term anthropogenic nitrogen input and its legacy on riverine output

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Апрель 30, 2025

Язык: Английский

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Emergent Plants Improve Nitrogen Uptake Rates by Regulating the Activity of Nitrogen Assimilation Enzymes

Plants, Год журнала: 2025, Номер 14(10), С. 1484 - 1484

Опубликована: Май 15, 2025

Effectively utilizing aquatic plants to absorb nitrogen from water bodies and convert it into organic via assimilation enzyme activity reduces concentrations. This serves as a critical strategy for mitigating agricultural non-point source pollution in the Yellow River Basin However, emergent plants' rate mechanism of uptake different forms remain unclear. study determined rates, activities, root properties, photosynthetic parameters four plants, Phragmites australis, Typha orientalis, Scirpus validus, Lythrum salicaria, under five NH4+/NO3- ratios (9:1, 7:3, 5:5, 3:7, 1:9) using 15N hydroponic simulations. The results demonstrated that both form plant species significantly influenced rates plants. In with varying ratios, P. australis T. orientalis exhibited higher inorganic than S. validus L. increasing by 11.83-114.69% 14.07-130.46%, respectively. When ratio body was 9:1, reached its peak, which 729.20 μg·N·g-1·h-1 DW (Dry Weight). highest, reaching 763.71 DW. preferences significant environmental plasticity. At an preferred NO3--N, whereas salicaria favored NH4+-N. NH4+-N positively correlated glutamine synthetase glutamate synthase while NO3--N NR activity. These findings indicate processes these involve synergistic mechanisms adaptation physiological regulation, enabling more effective utilization water. Additionally, dehydrogenase (GDH), suggesting they are better adapted eutrophication GDH pathway. specific surface area plays crucial role regulating amount exerted greatest total impact on rate, followed traits enzymes. Therefore, there were interspecific differences response various forms. It is recommended prioritize use highly adaptable such irrigation area.

Язык: Английский

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Optimization of ammonia nitrogen benchmarks and ecological risk assessment in monsoon freezing lakes based on species sensitivity distribution with Lake Chagan in northeastern China as an example

Ecological Indicators, Год журнала: 2024, Номер 166, С. 112346 - 112346

Опубликована: Июль 13, 2024

Язык: Английский

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Artificial Cultivation of Aquatic Plants Promotes Nitrogen Transformation and Key Functional Genes in Agricultural Drainage Ditch Sediments in the Yellow River Irrigation Area, China

Опубликована: Авг. 12, 2024

Excess nitrogen in agricultural drainage poses a serious threat to the water quality safety of Yellow River basin. Utilizing aquatic plants modify rhizosphere microbial community structure and facilitate transformation is crucial strategy for mitigating regional eutrophication. Our results revealed that denitrification rate (DR), dissimilatory nitrate reduction ammonium (DNRAR) fixation (NFR) sediments exhibited significant increase artificially cultivated ditch. Compared with those natural ditches, richness bacterial relative abundances Bacteroidota, Verrucomicrobiota, Firmicutes, Anaeromyxobacter Geobacter, which are involved mainly cycle, ditch were significantly greater due improvements environmental conditions. In ditch, dominant functional genes affecting DRNARs P. australis nrfC nrfA, while DRs driven by norB napA, influenced carbon levels; NFRs T. orientalis nifD, nifK nifH. provide scientific basis use excess levels drainage.

Язык: Английский

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Effect of Agricultural Structure Adjustment on Spatio-Temporal Patterns of Net Anthropogenic Nitrogen Inputs in the Pearl River Basin from 1990 to 2019

Land, Год журнала: 2023, Номер 12(2), С. 311 - 311

Опубликована: Янв. 22, 2023

Worldwide urbanization has brought dramatic changes in agricultural structures, as well serious non-point source pollutions of nitrogen and phosphorus. However, understanding the effect structure adjustment on net anthropogenic inputs (NANI) been still limited. In this paper, statistical data from Yearbook, National Economic Social Development Statistical Bulletin were collected 1990 to 2019 Pearl River Basin, China, used analyze spatial temporal patterns NANI its influencing factors. The results indicated that significantly influenced last 30 years Basin. decreased 2019, had a pattern higher values upstream areas lower downstream areas. terms input sources NANI, economically developed regions downstream, are dominated by food/feed nitrogen, which accounted for an average 49.6% total inputs. with relatively low economic development, fertilizer 54.9% A novel index namely ratio non-agricultural NANI(ASNA), was also proposed characterize impact industry restructuring over time. Similar characteristics ASNA showed decreasing trend study area. Moreover, variables (agricultural land area, consumption livestock farming density) tended contribute less explained variances, while contributions factors (population density GDP) increased 2019. This contribution increased, shifts sectors secondary tertiary Our findings suggest differently regional targeting should be considered pollution management focuses areas, but highlights

Язык: Английский

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