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| Characteristics of non-point source pollutant discharges from different types of land use in Dongjiang River Basin |
| Received:January 13, 2016 |
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| KeyWord:non-point source pollution;basin;land use type;first flush effect |
| Author Name | Affiliation | E-mail | | HUANG Zhi-wei | School of the Environment, Jinan University, Guangzhou 510632, China
The Key Laboratory of Water and Air Pollution Control of Guangdong Province, South China Institute of Environmental Sciences, MEP, Guangzhou 510535, China | | | ZENG Fan-tang | The Key Laboratory of Water and Air Pollution Control of Guangdong Province, South China Institute of Environmental Sciences, MEP, Guangzhou 510535, China | | | SHI Lei | School of the Environment, Jinan University, Guangzhou 510632, China | shilei9899@163.com | | LIN Shu | The Key Laboratory of Water and Air Pollution Control of Guangdong Province, South China Institute of Environmental Sciences, MEP, Guangzhou 510535, China | linshu@scies.org | | FANG Huai-yang | The Key Laboratory of Water and Air Pollution Control of Guangdong Province, South China Institute of Environmental Sciences, MEP, Guangzhou 510535, China | | | LIU Yue-dan | The Key Laboratory of Water and Air Pollution Control of Guangdong Province, South China Institute of Environmental Sciences, MEP, Guangzhou 510535, China | |
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| Abstract: |
| Field studies were conducted to evaluate the discharge characteristics of nutrient pollutants and typical heavy metals in runoffs due to rainfall under different types of land use in Dongjiang River Basin. Results indicated that the runoff from agricultural land was the main non-point pollution source in Dongjiang River Basin, while the heavy metal emissions from highway could not be ignored. In courtyard, the first flush effect(FFE) was significant for suspended solids(SS) and chemical oxygen demand(COD), but insignificant for the contamination of total nitrogen(TN), total phosphorous(TP) and heavy metals(e.g., As, Cu, Pb and Zn). For traffic roads, vegetable field, paddy field, and woodland, however, FFEs were observed for most of the pollutants. The secondary flush effect was observed at the late stage of raining. Pearson correlation analysis showed that the correlation between pollution load and runoff flow was significant under the courtyards, traffic road and vegetable fields, but insignificant for the cropland and woodland, mainly due to the great difference in the rainfall interval and characteristics. The FFE was in order of SS> COD> Pb> TN> Zn> TP> Cu> As. In general, FFE was more obvious for the nutrient pollutants than for the heavy metals. Land use types greatly influenced heavy metals. Of different types of land use, FEE was the most observed in agricultural land. However, for traffic roads, FFEs were found mainly for heavy metals. In conclusion, rainfall quantity, rainfall intensity and rain interval are main factors influencing FFE. |
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