Estimation of nitrogen and phosphorus pollution loads from non-point sources in farmland of Hetao Irrigation District, Inner Mongolia

WANG Yan; JIAO Yan; YANG Wen-zhu; YAN Ying-chao; WU Hong; LING Ling; SHI Yue-chao

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (12) : 6551-6560.

Estimation of nitrogen and phosphorus pollution loads from non-point sources in farmland of Hetao Irrigation District, Inner Mongolia

WANG Yan, JIAO Yan, YANG Wen-zhu, YAN Ying-chao, WU Hong, LING Ling, SHI Yue-chao

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Abstract

To understand the current situation of farmland non-point source pollution in the Hetao irrigation district of Inner Mongolia, the traditional export coefficient model (ECM) was improved, and the farmland non-point source nitrogen and phosphorus pollution load was quantified by precipitation impact factor (α) and terrain impact factor (β) in the area. The farmland non-point source nitrogen and phosphorus discharged into the river (Wuliangsuhai) was estimated, and the critical source areas of pollution was identified by the pollution river influx coefficient (γ). The total export load of non-point source total nitrogen (TN) and total phosphorus (TP) from farmland were 3520.998 and 407.125t in the Hetao irrigation district in 2021, accounting for 79.674% and 89.201% of the total pollution load from different land use types, respectively. The spatial distribution of the export loads for TN and TP of farmland non-point sources was consistent, and the contribution in towns near drainage was the highest. The export loads of TN and TP pollution were 316.658, 236.725, 199.344t/a and 36.615, 27.371, 23.050t/a in Xinhua, Xin'an and Talhu township, respectively. The amount of TN and TP discharged into the river were 387.310 and 16.285t/a from non-point sources of farmland. The towns of Xinhua, Xin'an, Talhu, Longxingchang, Tuanjie and Manhui were key areas for pollution prevention and control in the Hetao irrigation district. The rationality of the improved export coefficient model with relative errors of -4.743% and 19.037% had been verified by comparing with measured values.

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farmland non-point source pollution / Hetao irrigation district / improved export coefficient model / TN / TP

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WANG Yan, JIAO Yan, YANG Wen-zhu, YAN Ying-chao, WU Hong, LING Ling, SHI Yue-chao. Estimation of nitrogen and phosphorus pollution loads from non-point sources in farmland of Hetao Irrigation District, Inner Mongolia[J]. China Environmental Science. 2023, 43(12): 6551-6560

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