Estimation of non-point source pollution loads by improvising export coefficient model in watershed with a modified planting pattern

Export coefficient model was improved to calculate and compare non-point source pollution loads in an agricultural watershed before and after implanting new cropping pattern. The modification was done by introducing the reduction coefficient in consumption amount and loss load as well as the proport...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2017-08, Vol.82 (1), p.12068
Main Authors: Dong, F, Liu, X B, Peng, W Q, Wang, L
Format: Article
Language:English
Subjects:
Agricultural watersheds
Coefficients
Cropping systems
Emission analysis
Emissions control
Loads (forces)
Mathematical models
Nonpoint source pollution
Pesticides
Point source pollution
Pollutants
Pollution control
Pollution load
Pollution sources
Water conservation
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Summary:Export coefficient model was improved to calculate and compare non-point source pollution loads in an agricultural watershed before and after implanting new cropping pattern. The modification was done by introducing the reduction coefficient in consumption amount and loss load as well as the proportion of bioactive ingredients of fertilizer and pesticide to the export coefficient model developed by Johnes in 1996. The modified export coefficient model was then applied to estimate non-point source pollution load in Gaoxi community, Yunnan Province, China where a water-saving and emission reduction technology was implemented by changing cropping pattern. Study results showed that the improved export coefficient model had a favorable flexibility in calculating the non-point source pollution loads and well applicable to the watersheds where various input data is in short. Moreover, the findings will provide scientific basis to understand the variability of non-point source pollutants in agricultural watersheds and their load estimation in order to optimize the efficiency of pollutants reduction plan implemented through agricultural adjustment.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/82/1/012068