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- W2364136229 abstract "Based on Material Flow Analysis,the phosphorus cycle in the watershed of the primary source water area for Beijing-the watershed of the Miyun Reservoir-was studied.Phosphorus(P) input and output of four sub-systems(planting,animal husbandry,population and a simple sub-system representing all other inputs and outputs),the metabolic efficiency of the whole system,and the factors affecting pollution load are discussed.The main conclusions are as follows:①Chemical products,mainly fertilizers,feed additives,and pesticides,are the main sources of P input to the watershed,accounting for 52.9% of total imported P.The P input of the system to the environment is 2868.44 t,among which 76.5% of system phosphorus enters the water body directly.②The animal husbandry sub-system is the largest contributor of P load in water,which exports 82% of the total P load in water.The planting sub-system contributes 9.4% of the total P load in water.③The overall structure of the system is open,monodirectional and unharmonious.The P cycle in the planting system is deficient,but the animal husbandry system has a P surplus with uneven regional characteristics.Excreta from livestock and humans has not been effectively reused and recycled,so 40.9% excreta went directly into the water,resulting in P accumulation in water and further serious waste of resources and extensive environmental impact.④The water pollution loads of different counties are related closely with urbanization rates." @default.
- W2364136229 created "2016-06-24" @default.
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- W2364136229 date "2009-01-01" @default.
- W2364136229 modified "2023-09-23" @default.
- W2364136229 title "Material flow analysis of the phosphorus cycle in the upper watershed of the Miyun Reservoir in Beijing" @default.
- W2364136229 hasPublicationYear "2009" @default.
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