Nitrogen mass balance and uptake velocity for eutrophic reservoirs in the Brazilian semiarid region

Environmental Science and Pollution Research, Год журнала: 2023, Номер 30(42), С. 95621 - 95633

Опубликована: Авг. 9, 2023

Язык: Английский

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The Characteristics of Net Anthropogenic Nitrogen and Phosphorus Inputs (NANI/NAPI) and TN/TP Export Fluxes in the Guangdong Section of the Pearl River (Zhujiang) Basin

Sustainability, Год журнала: 2022, Номер 14(23), С. 16166 - 16166

Опубликована: Дек. 3, 2022

Human activities have greatly influenced the inputs and cycling pathways of nitrogen (N) phosphorus (P), causing dramatic environmental problems in Pearl River Basin. In this study, characteristics net anthropogenic (NANI/NAPI) were analyzed Guangdong section Basin from 2016 to 2020. NANI showed a very slight decrease trend (1.51 ± 0.09) × 104 (1.36 0.08) kg·N·km−2·yr−1, while average intensity NAPI was 3.8 103 kg·P·km−2·yr−1. Both intensities at high levels, resulting serious deterioration water quality Fertilizer input most important component for NAPI, accounting 38–42% 53–56%. However, Delta, major components human animal consumption (food/feed) non-food input. The should be controlled different areas, based on differing driving forces, alleviate quality. This study is one prerequisites clarifying quality, providing support further effective control pollution River.

Язык: Английский

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Dynamic changes of net anthropogenic nitrogen/phosphorus input and its riverine export in the Beijing's subcenter

CLEAN - Soil Air Water, Год журнала: 2024, Номер 52(3)

Опубликована: Фев. 2, 2024

Abstract Due to human activities, the overabundance of regional nitrogen/phosphorus (N/P) has a huge impact on ecological environment worldwide. It is necessary comprehensively understand human‐induced N/P input and spatiotemporal variations nutrients in river. As adjustment spatial structure Beijing, Beijing's subcenter an important strategic position promoting coordinated development Beijing–Tianjin–Hebei. In this study, dynamic changes ammonia nitrogen (NH 3 ‐N) total phosphorus (TP) from 2012 2022 were analyzed, then net anthropogenic N (NANI) P (NAPI) was estimated subcenter. The results showed that both NH ‐N TP had overall downward trend with three‐stage pattern. NANI NAPI declined 5.68 × 10 4 0.95 0.78 0.15 kg km −2 per year, respectively. chemical fertilizers accounted for largest part at 53–81% 49–80% NAPI. There high values southeast Tongzhou, fluxes positively correlated Chaobai River Basin (Tongzhou District) Beiyun District). This study would provide foundation setting priorities enacting more targeted management strategies

Язык: Английский

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Unraveling the Influence of Precipitation and Temperature Variability on Anthropogenic Nutrient Inputs in a River Basin: Implications for Environmental Management

Опубликована: Янв. 1, 2024

Since the Industrial Revolution, anthropogenic activities have substantially increased input of nitrogen (N) and phosphorus (P) into river basins, complexity by interplay with climate. This study analyzed characteristics N P inputs within Dawen River Basin from 2000 to 2021 using Net Anthropogenic Nitrogen Input (NANI) Phosphorus (NAPI) methods, explored how those variables respond precipitation temperature variability. We found a generally decreasing trend in NANI over time, an average 17,882.34 kg km-2 yr-1. In contrast, NAPI showed initially increasing then 2021, value 5,151.79 Fertilizer usage emerged as primary source nutrient inputs, accounting for approximately 63.42% 61.88% inputs. Precipitation positively impacted while exerted more influential but opposing effect. Time-lag effects were evident, demonstrated stronger influences preceding year on NAPI. Moreover, climate not only quantity also highly correlated their changes, well dynamics components. Through quantitative analyses, we unveiled key thresholds correlation between variables, cutoffs 14.1℃ 820 mm precipitation. These insights highlight complex relationship variability, underscoring importance sustainable management practices mitigate negative environmental impacts.

Язык: Английский

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

Land, Год журнала: 2024, Номер 13(10), С. 1557 - 1557

Опубликована: Сен. 25, 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. We here compare key processes occurring sediments ditch artificially planted with mix species (Phragmites australis, Typha orientalis, Nymphaea tetragon) occupied by naturally vegetation, dominated either P. australis or T. orientalis. Our results revealed effect, an increased denitrification rate (DR) dissimilatory nitrate reduction ammonium (DNRAR) cultivated compared orientalis vegetation. The fixation (NFR) artificial setting comparison natural richness bacterial relative abundances Bacteroidota, Firmicutes, Geobacter were significantly greater due availability organic carbon. In ditch, dominant functional genes affecting DRNARs nrfC nrfA, whereas DRs driven mainly norB napA, which influenced carbon levels. NFRs nifD, nifK, nifH. provide scientific basis use excess levels drainage.

Язык: Английский

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Spatio-Temporal Analysis of Net Anthropogenic Phosphorus Inputs (NAPIs) and Their Impacts in Ningxia Hui Autonomous Region Using Monte Carlo Simulations and Sensitivity Analysis

Water, Год журнала: 2024, Номер 16(22), С. 3160 - 3160

Опубликована: Ноя. 5, 2024

This study employed the Net Anthropogenic Phosphorus Inputs (NAPI) model to assess impact of human activities on phosphorus input in a watershed, analyzing county-level statistical data and NAPI parameters from 1991 2020. The Monte Carlo method was used for quantitative analysis parameters’ effects each component overall simulation results. sensitivity index identified component’s sensitive parameters. found that lowest value 454 kg/(km2·a) highest 1336 2003. Ningxia showed an upward trend 1999, slight decrease 1999 2003, increase 2003 2020, with fertilizer being main contributing factor, accounting 77.4% total input. On spatial scale, significantly correlated land use patterns, showing higher values northern southern regions compared central part. derived simulations appropriate ranged −24.83% 31.49%. highlighted net food feed imports as having uncertainty, impacting results within range −23.89% 53.98%. It observed larger proportion model, more its parameters, (Pfer) notably than those food/feed non-food (Pnf) components. These findings can inform pollution control policies Northwest China, while selection provides useful reference future research other regions.

Язык: Английский

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Nitrogen mass balance and uptake velocity for eutrophic reservoirs in the Brazilian semiarid region

Research Square (Research Square), Год журнала: 2023, Номер unknown

Опубликована: Апрель 18, 2023

Abstract The nitrogen (N) cycle from the catchment to downstream reservoir is complex, particularly quantification of N losses. However, in order assess impact a ecosystem, simplified models may be applicable regarding TN load production and magnitude lake removal. This study presented methodology perform validate mass balance further calibrate coefficient for losses ( v f .) 29 tropical semiarid reservoirs. reservoirs were highly productive ecosystems with an average total (TN) concentration, accounting all measurements reservoirs, ranging 0.59 mg L − 1 3.84 . Regarding load, median values ranged 4.35 2,499.43 t yr 80.34 loads estimated through annual over twenty-four-year period. estimates was compared reference obtained by using export modelling coefficient. correlation between resulted satisfactory agreement (r² 0.88) reinforced reliability alternative. From validated loads, uptake velocity ) (44.9 ± 20.1 m could described as general function water residence time. region have demonstrated higher than temperate lakes similar Latin America/Caribbean ones. As expected, warmer climates tend present intensified loss processes regions. proposed can used potentially improve quality management

Язык: Английский

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Hierarchical Spatially Varying Coefficient Process Regression for Modeling Net Anthropogenic Nitrogen Inputs (NANI) from the Watershed of the Yangtze River, China

Sustainability, Год журнала: 2023, Номер 15(16), С. 12567 - 12567

Опубликована: Авг. 18, 2023

The increasing discharge of nitrogen nutrients into watersheds calls for assessing and predicting inputs, as an important basis formulating management strategies. traditional net anthropogenic inputs (NANI) budgeting model relies on 45 predictor variables, which data are sourced from local or national statistical yearbooks. large number variables involved makes NANI accounting difficult, the missingness reduces its accuracy. This study aimed to build a prediction based few possible. We built last 30 years watershed Yangtze River in China, with readily available complete socio-economic (per gross domestic product, population density) through hierarchical spatially varying coefficient process (HSVC), exploits underlying spatial associations within 11 sub-basins impacts improve accuracy prediction. results showed that performed better than Gaussian (GP) spatio-temporal dynamic linear (DLM). predicted NANIs entire catchment 2025 2030 were 11,522.87 kg N km−2 12,760.65 km−2, respectively, showing obvious trend. Nitrogen fertilizer application was be 5755.1 2025, most significant source NANI. In addition, point 95% interval also provided. Our approach provides simple easy-to-use method

Язык: Английский

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Evaluating Effects of Nitrogen and Phosphorus Discharges under Different Reduction Scenarios: A Case of Chaohu Lake Basin, China

Agronomy, Год журнала: 2023, Номер 13(12), С. 3079 - 3079

Опубликована: Дек. 18, 2023

Determining the amount of nitrogen (N) and phosphorus (P) discharged into lakes assessing effectiveness reduction measures in a basin that involve interaction multiple factors are still daunting challenges. In this study, random forest (RF) model was employed to simulate impact controlling on N P 2025 under seven specific scenarios. Discharged decreased by 23.38% 31.69% from 2011 2020, respectively. The nutrient discharge intensities were significantly higher western part (13.31 kg·ha−1·a−1 1.34 kg·ha−1·a−1) than those eastern region (10.24 0.74 kg·ha−1·a−1). Fertilizer runoff (N: 34.72%, 5934.49 t; P: 13.60%, 199.76 t), domestic sewage 29.14%, 4009.27 34.84%, 496.59 livestock farming 15.11%, 2657.50 40.05%, 616.05 t) key sources P. RF shows (R2 > 0.994, p < 0.01) multi-factor effect is best, effect, expected decrease 13.79% 19.42%, respectively, compared with 2020. addition, different sub-basins might lead regional differences effects various measures. Ultimately, we recommend synergistic treatment point non-point sources, using treatments measures, should be implemented regions reduce Chaohu Lake Basin.

Язык: Английский

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