doi:

DOI: 10.3724/SP.J.1011.2010.01295

Chinese Journal of Eco-Agriculture (中国生态农业学报) 2010/18:6 PP.1295-1301

Analysis on current situation of water pollution and pollutant sources in Ningxia Yellow River irrigation region


Abstract:
With the control of point source pollution, the agricultural non-point source pollution is becoming the major factor affecting water quality. In Ningxia Yellow River irrigation region, one of China’s important commodity grain production areas, high-input in agriculture exacerbates the local water quality. This article analyzed water quality of the Yellow River flowing over several monitoring sections and of main drainage ditches in Ningxia. The results show that water quality of the Yellow River in Ningxia is mainly affected by agricultural irrigation return flow, industrial wastewater and domestic sewage. The water quality becomes worse after flowing through Ningxia with one class decreasing of comprehensive pollution index illustrating a certain degree of pollution. The main pollutants in Ningxia Yellow River irrigation region are Ar-OH, NH4+-N, CODMn and BOD5, which are decreasing generally from 2002 to 2007 in company with the reducing comprehensive pollution index. Water quality of main drainage ditches of the region is inferior class Ⅴ with 100% overproof monitor-ing sections. Its main pollutants are NH4+-N, CODCr, BOD5. The analy-sis on non-point pollution source shows that TN and NH4+-N mainly come from farming, followed by breeding industry and the Yellow River water. Farming and livestock breeding are the main resources of TP. Most COD is from live-stock breeding. The large amount of pollutants in farmland irrigation return flow is one of the major factors leading to deterioration of water quality in Ningxia.

Key words:Ningxia, Yellow River irrigation region, Water quality of the Yellow River, Non-point pollution, Pollution source, Farmland irrigation return flow

ReleaseDate:2014-07-21 15:35:10



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