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Phosphorus removal by the multipond system sediments receiving agricultural drainage in a headstream watershed

Journal of Environmental Sciences 2005年第3期17卷 404-408页

作者： FUQiang YINCheng-qing MAYun StateKeyLaboratoryofEnvironmentalAquaticChemistry ResearchCenterforEeo-EnvironmentalSciencesChineseAcademySciencesBeijing100085China DepartmentofWatersourcesandEnvironmentalEngineering ChinaUniversityofGeosciencesBeijing100083China

Wetland systems in headstream watersheds are important to control the nonpoint source pollutant phosphorus. Experiments were conducted using intact sediment-water columns obtained from the multipond system in Liuchahe watershed of Chaohu Lake to determine its capacity to retain P. It was found that pond sediments had strong P retention ability. For the Hill pond, Village pond and Rice pond, their retention coefficient(A) were 288.3, 279.2 and 260.8 L/m2, respectively. The equilibrium P concentration(EPC_w) were 0.016, 0.028 and 0.018 mg/L, respectively. The Hill pond indicated the highest P retention ability. P retained in the pond sediments indicated high stable degree. P removal from the overlying water column into the pond sediments followed a first-order kinetic model. Under the experimental hydrological conditions, the retention time had a positive correlation with the P loading. The multipond system could provide enough retention time to retain P in drainage runoffs. At the P levels evaluated, the sediments of the multipond system are effective sinks to retain P from nonpoint source runoffs.

关键词： phosphorus pond sediment watershed nonpoint source

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Phosphorus sorption capacities in a headstream landscape—The pond chain structure

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Journal of Environmental Sciences 2006年第5期18卷 1004-1011页

作者： FU Qiang YIN Cheng-qing SHAN Bao-qing State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Understanding phosphorus sorption phenomena in different wetland sediments is important in controlling the P output in headstream watersheds. The pond chain structure （PCS） is widespread in the headstream agricultural watersheds in the southeast of China. Phosphorus sorption characteristics were determined for pond surface sediments （0-12 cm） along a pond chain structure in Liuchahe watershed of Chaohu Lake. Results showed that P sorption capacities （expressed by P sorption index （PSI）） varied both with the landscape position of the ponds and sediment depth. From foothill ponds to riverside ponds the P sorption capacities indicated a significant gradient variability. The higher elevation ponds showed greater sorption capacities, and with the pond elevation decline, P sorption capacities gradually decreased. Some physico-chemical properties, such as pH, oxalate-extractable Fe （Feox）, organic matter （TOC） and Mehlich l-extractable Ca, Mg of pond sediments also indicated significant gradient variability from high elevation ponds to low elevation ponds. Feox was the sediment parameters most highly positively correlated with PSI and was the key factor in controlling P sorption capacity in the pond chain structure （r=0.92, p〈0.001）. Long-term hydrologic and sediment inputs can affect the distribution of sediment constituents and further affect the P sorption capacity. Making the best of the spatial difference of sorption capacities of ponds in watersheds to control nonpoint source P pollutant is necessary.

关键词： pond sediment adsorption spatial variability nonpoint source

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维普期刊数据库

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DEVELOPMENT OF A DECISION SUPPORT SYSTEM FOR MANAGING PESTICIDE LOSSES IN AGRICULTURAL WATERSHEDS

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International Journal of Sediment Research 2003年第1期18卷 60-73页

作者： Y.-F.LI,Y.R.LI,G.H.HUANG,J.STRUGER,J.D.FISCHER,B.CHEN,J.B.LI,X.H.NIE University of Regina University of Regina University of Regina University of Regina University of Regina ARQI-Environment Canada 4905 Dufferin Street Downsview Ontario M3H5T4 Canada Faculty of Engineering Sask S4S 0A2 Canada Faculty of Engineering Sask S4S 0A2 Canada EHD-Environment Canada 867 Lakeshore Road Burlington Ontario L7R 4A6 Canada CWS-Environment Canada 867 Lakeshore Road Burlington Ontario L7R 4A6 Canada Faculty of Engineering Sask S4S 0A2 Canada Faculty of Engineering Sask S4S 0A2 Canada Faculty of Engineering Sask S4S 0A2 Canada

In this study, a decision support system for managing pesticides losses in agricultural watersheds, based on a number of simulation, GIS and RS technologies was developed. The system allows acquisition of information through not only on-site survey but also RS technologies. Aerial photographs were used to generate DEM, and a set of terrain analysis methods were employed to calculate hydrological parameters that are needed for the pesticide loss model. The system also facilitates convenient management and presentation of vast amounts of modeling inputs and outputs through user interfaces. A case study in the Kintore Creek Watershed, Ontario, Canada was undertaken to provide bases for environmental management in the watershed and to demonstrate practical applicability of the developed DSS. The modeling outputs were verified through monitoring data, demonstrating reasonable prediction accuracy. The result indicated that the model provides an effective means for forecasting pesticide losses from agriculture lands. Especially, incorporation of GIS and remote sensing with the pesticides losses model provide a powerful tool for system simulation and environmental management. The major contribution of this study is the development of a new integrated modeling system for simulating fate of pesticides in agricultural lands, as well as its application to a real Canadian case study. In detail, a dynamic simulation model was developed, a solution algorithm was implemented, and the modeling results were verified. The developed simulator was also enhanced through incorporation of GIS and RS technologies within its framework to facilitate effective data acquisition and management, as well as input/output presentation. DEVELOPMENT OF A DECISION SUPPORT SYSTEM FOR MANAGING PESTICIDE LOSSES IN AGRICULTURAL WATERSHEDS Y.-F. LI1, Y. R. LI2, G. H. HUANG2, J. STRUGER3, J. D. FISCHER4, Xinzhu WANG5, B. CHEN2, J. B. LI2 and X. H. NIE2 ABSTRACT In this study, a decision support system f

关键词： Agriculture Decision GIS nonpoint source Pesticide Rainfall Remote sensing Runoff Simulation Watershed

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