AI Article Synopsis
- Experiments were conducted in hilly areas around Taihu Lake to study how different rainfall intensities affect nutrient concentrations in surface runoff from agricultural lands.
- Rainfall intensity was found to significantly influence the concentrations of total phosphorous (TP), phosphate (PO4(3-) -P), ammonium (NH4+ -N), total nitrogen (TN), and nitrate (NO3- -N), showing different relationships based on the intensity of rain.
- Results indicated that mass losses of TN and TP in runoff were positively correlated with rainfall amount and intensity, with shifts in dominant nutrient forms occurring based on varying rainfall conditions, such as light rain favoring dissolved forms and heavy rain favoring particulate forms.
Article Abstract
To investigate the effect of rainfall on agricultural nonpoint source pollution, watershed scale experiments were conducted to study the characteristics of nutrients in surface runoff under different rainfall intensities from farmlands in gentle slope hilly areas around Taihu Lake. Rainfall intensity significantly affected N and P concentrations in runoff. Rainfall intensity was positively related to TP, PO4(3-) -P and NH4+ -N event mean concentrations(EMC). However, this study have found the EMC of TN and NO3- -N to be positively related to rainfall intensity under light rain and negatively related to rainfall intensity under heavy rain. TN and TP site mean amounts (SMA) in runoff were positively related to rainfall intensity and were 1.91, 311.83, 127.65, 731.69 g/hm2 and 0.04, 7.77, 2.99, 32.02 g/hm2 with rainfall applied under light rain, moderate rain, heavy rain and rainstorm respectively. N in runoff was mainly NO3- -N and NH4+ -N and was primarily in dissolved form from Meilin soils. Dissolved P (DP) was the dominant form of TP under light rain, but particulate P (PP) mass loss increased with the increase of rainfall intensity and to be the dominant form when the rainfall intensity reaches rainstorm. Single relationships were used to describe the dependence of TN and TP mass losses in runoff on rainfall, maximum rainfall intensity, average rainfall intensity and rainfall duration respectively. The results showed a significant positive correlation between TN mass loss and rainfall, maximum rainfall intensity respectively (p < 0.01) and also TP mass loss and rainfall, maximum rainfall intensity respectively (p < 0.01).
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Predicted Potential for Aquatic Exposure Effects of Per- and Polyfluorinated Alkyl Substances (PFAS) in Pennsylvania's Statewide Network of Streams.
Toxics
December 2024
Pennsylvania Water Science Center, U.S. Geological Survey, New Cumberland, PA 17070, USA.
Per- and polyfluoroalkyl substances (PFAS) are contaminants that can lead to adverse health effects in aquatic organisms, including reproductive toxicity and developmental abnormalities. To assess the ecological health risk of PFAS in Pennsylvania stream surface water, we conducted a comprehensive analysis that included both measured and predicted estimates. The potential combined exposure effects of 14 individual PFAS to aquatic biota were estimated using the sum of exposure-activity ratios (ΣEARs) in 280 streams.
View Article and Find Full Text PDFStability analysis of an expansive soil slope under heavy rainfall conditions with different anchor reinforcements.
Sci Rep
January 2025
Department of Geotechnical Engineering, School of Civil Engineering, Tongji University, Shanghai, 200000, China.
This study investigates the vulnerability of expansive soil slopes to destabilization and damage, particularly under intense rainfall, due to their heightened sensitivity to moisture. Focusing on a project in Yunnan Province, numerical simulation software is employed to address slope stability challenges. Meanwhile, the soil mechanical parameters of this study were acquired through experimentation.
View Article and Find Full Text PDFDynamic transformation and leaching processes of nitrogen in a karst agricultural soil under simulated rainfall conditions.
J Contam Hydrol
December 2024
Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China.
Frequent exchange of surface water and groundwater in karst agricultural areas results in soil nutrient loss during rainfall and consequent deterioration of the aquatic environment. To understand nitrogen (N) transformation and leaching processes from karst soil during rainfall events, two typical N fertilizers were added to karst soil and consequently investigated the nitrogenous species using soil column experiments system. The contents of various N forms in the soil and leachate were analyzed, and the net nitrification and the N leaching rates were calculated.
View Article and Find Full Text PDFProjected changes in climate extremes over Tanzania.
Sci Rep
January 2025
Department of Documentation and Publication, Directorate of Knowledge Management, Commission for Science and Technology, Dar Es Salaam, Tanzania.
Understanding projected changes in climate extremes at local and regional scales is critical for reducing society's vulnerability to such extremes, as it helps to devise informed adaptation strategies and contributes to informed decision-making processes. In this paper, we analysed projected changes in climate extremes across regions in Tanzania using outputs of high-resolution regional climate models from the Coordinated Regional Climate Downscaling Experiment program (CORDEX-Africa). The indices analysed here are those recommended by the Expert Team on Climate Change Detection and Indices (ETCCDI) to characterise climate extremes over different regions.
View Article and Find Full Text PDFControls on nitrogen export to an ephemeral stream network of St. Croix, US Virgin Islands.
J Environ Qual
January 2025
Agricultural Experiment Station, University of the Virgin Islands, Kingshill, Virgin Islands, USA.
Ephemeral streams are important pollutant conduits, but the mechanisms that control nutrient transport to these systems remain unclear. In the US Virgin Islands (USVI), where most streams flow ephemerally, a lack of continuous hydrologic and water quality data limits our understanding of streamflow behavior and its influence on water quality. We therefore assessed the impact of soil moisture and hydrometeorological conditions on nitrogen (N) concentrations within an ephemeral stream on St.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!