Spatial distribution, sources, and human health risk assessment of elevated nitrate levels in groundwater of an agriculture-dominant coastal area in Hainan Island, China

Journal of Hydrology, Journal Year: 2024, Volume and Issue: 634, P. 131088 - 131088

Published: March 22, 2024

Language: Английский

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Measurement and spatio-temporal transfer of greenhouse gas emissions from agricultural sources in China: A food trade perspective

Resources Conservation and Recycling, Journal Year: 2023, Volume and Issue: 197, P. 107100 - 107100

Published: July 3, 2023

Language: Английский

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Mitigating soil degradation in continuous cropping banana fields through long-term organic fertilization: Insights from soil acidification, ammonia oxidation, and microbial communities

Industrial Crops and Products, Journal Year: 2024, Volume and Issue: 213, P. 118385 - 118385

Published: March 23, 2024

Language: Английский

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Satellite and Machine Learning Monitoring of Optically Inactive Water Quality Variability in a Tropical River

Remote Sensing, Journal Year: 2022, Volume and Issue: 14(21), P. 5466 - 5466

Published: Oct. 30, 2022

Large-scale monitoring of water quality parameters (WQPs) is one the most critical issues for protecting and managing resources. However, optically inactive WQPs, such as total nitrogen (TN), ammoniacal (AN), phosphorus (TP) in inland waters, still challenging. This study constructed retrieval models to explore spatiotemporal evolution TN, AN, TP by Landsat 8 images, sampling, five machine learning algorithms (support vector regression, SVR; random forest RFR; artificial neural networks, ANN; regression tree, RT; gradient boosting machine, GBM) Nandu River downstream (NRD), a tropical river China. The results indicated that these can effectively monitor concentrations at situ sites. In particular, TN RFR well AN ANN had better accuracy, which R2 value ranged between 0.44 0.67, RMSE was 0.03–0.33 mg/L testing dataset. spatial distribution seasonal NRD from 2013–2022. should be paid more attention normal wet seasons urban agricultural zones, respectively. TP, however, focus on season zones. Temporally, decreased significantly while others showed little change. These could provide large-scale overview quality, find sensitive areas periods pollution, assist identifying controlling non-point source pollution NRD. demonstrated multispectral remote sensing have great potential WQPs rivers.

Language: Английский

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Performance of lagoon and constructed wetland systems for tertiary wastewater treatment and potential of reclaimed water in agricultural irrigation

Journal of Environmental Management, Journal Year: 2023, Volume and Issue: 348, P. 119278 - 119278

Published: Oct. 11, 2023

Climate change poses challenges to agricultural water resources, both in terms of quantity and quality. As an adaptation measure, the new European Regulation (EU) 2020/741 establishes different quality classes for use reclaimed irrigation. Italy is also working on definition a regulation reuse irrigation (in substitution current one) that will include specific requirements imposed by one. Nature-based Solutions (NBS) can be cost-effective environmentally friendly way facilitate reclamation reuse. The present study reports outcomes long-term monitoring campaign two NBS (e.g., constructed wetland (CW) lagoon system (LS)) comparing influent effluent concentrations contaminants E. coli, BOD5, TSS, TN TP) with threshold values regulations. results showed case studies, coli (about 100 CFU mL-1) BOD5 (lower than 25 mg L-1) mean concentration need further reduced suitable unlimited negative aspect, monitored NBS, increase TSS was observed, up 40 L-1 LS, making unsuitable CW has proven more effective nitrogen removal (the 3.4 L-1), whereas LS better at phosphorus (with 0.4 L-1). Based results, recommendations were made improve performance systems order have adequate quality, even class A. Furthermore, capacity meet crop nutrient needs analyzed, total rate coefficients calculated design future LSs.

Language: Английский

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Differentiating environmental scenarios to establish geochemical baseline values for heavy metals in soil: A case study of Hainan Island, China

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 898, P. 165634 - 165634

Published: July 18, 2023

Language: Английский

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Soil Erosion Characteristics in Tropical Island Watersheds Based on CSLE Model: Discussion of Driving Mechanisms

Land, Journal Year: 2024, Volume and Issue: 13(3), P. 302 - 302

Published: Feb. 28, 2024

Previous research has primarily focused on soil erosion issues in arid and semi-arid regions, with a limited understanding of mechanisms tropical areas. Additionally, there is lack holistic perspective to determine the spatial attribution erosion. The conversion rainforests into economically driven plantations, like rubber pulpwood, resulted distinct characteristics specific regions. To enhance our knowledge patterns it necessary examine three major watersheds Hainan Island from 1991 2021, which encompass significant geographical features such as island water sources rainforest national parks. study employed China Soil Loss Equation (CSLE) model, slope trend analysis, Pearson correlation land-use transfer matrix, analysis under different scenarios. results indicate that scenarios by combination natural human factors have greatest impact changes entire area. Co-driven increases affected 53.56% area, while co-driven decreases 21.74%. 31-year showed an overall increasing trend. Human were identified primary drivers increased Nandu River basin, climate anthropogenic influenced decrease In Changhua activities contributed increase, caused Wanquan intensified erosion, whereas mitigated it. This underscores combined It emphasizes importance considering human-induced when implementing control measures

Language: Английский

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Assessing genetic diversity in critically endangered Chieniodendron hainanense populations within fragmented habitats in Hainan

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: March 24, 2024

Abstract Habitat fragmentation has led to a reduction in the geographic distribution of species, making small populations vulnerable extinction due environmental, demographic, and genetic factors. The wild plant Chieniodendron hainanense , species with extremely populations, is currently facing endangerment thus requires urgent conservation efforts. Understanding its diversity essential for uncovering underlying mechanisms vulnerability developing effective strategies. In our study, we analyzed 35 specimens from six different C. using genotyping-by-sequencing (GBS) single nucleotide polymorphism (SNP) methodologies. Our findings indicate that limited diversity. observed heterozygosity across ranged 10.79 14.55%, an average 13.15%. We categorized into two distinct groups: (1) Diaoluoshan Baishaling, (2) Wuzhishan, Huishan, Bawangling, Jianfengling. differentiation among these was found be relatively weak. loss likely result effects natural selection.

Language: Английский

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Mechanistic insights into mitigating N2O emissions by the nitrification inhibitor dicyandiamide (DCD) in a tropical sandy soil after six years of manure amendment

Pedosphere, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Language: Английский

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Effect of Biochar Types and Rates on SOC and Its Active Fractions in Tropical Farmlands of China

Agronomy, Journal Year: 2024, Volume and Issue: 14(4), P. 676 - 676

Published: March 26, 2024

To date, most studies have shown that biochar has great potential in carbon sequestration and reduction, as well soil quality improvement. However, there is limited knowledge of its effect on organic (SOC) fractions tropical farmland. This study aimed to determine the impact different types rates applied farmlands so SOC active fractions. The SOC, microbial biomass (MBC), dissolved (DOC), mineralizable (SMC) 0–30 cm layers under rice hull (R) peanut shell (P) treatments were measured. results showed application R P increased contents, stocks, cumulative stocks MBC, DOC 0–10 cm, 10–20 20–30 layers. with increasing rates. Compared CK, ranges 10.76–46.36%, 30.04–195.65%, 0.02–17.03%, respectively. R60 P60 had lowest SMC, decreasing by 14.69% 8.05%, treatment more than 20 t ha−1 reduced ratio SMC:SOC fractions:SOC. Therefore, it can be inferred improved levels DOC, could decrease mineralization, thus improving stability farmlands.

Language: Английский

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