川中丘陵区不同下垫面集水区氮磷流失特征

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Abstract To investigate the effects of different underlying surfaces on nitrogen (N) and phosphorus (P) losses via surface flow at a catchment scale, continuous daily monitoring of the surface flow and the concentrations of N and P was conducted in an agricultural catchment (AC) and a compound catchment (CC) in a hilly area of central Sichuan from 2019 to 2020. Results demonstrated a significant difference in the runoff process between the two catchments. The peak value of the surface flow was larger, the response speed was12 to 25min faster, and the annual runoff depth was 28.1% greater in CC than in AC. These results highlighted the effects of the contrasting underlying surfaces on the speed of runoff process, with the process being slowed down by the paddy fields and ponds in AC but speeded up by the impervious surfaces of the residential areas and roads in CC. During each rainfall event, the P concentration in runoff dropped more drastically, particularly in the late stage of the event, and the timing of peak P concentration was about 1.2hours earlier than those of N, respectively. Both the event mean concentration (EMC) and peak concentration of P or N were higher in CC than in AC. Nitrate-N was the main form of N losses in both catchments, accounting for 65.9% of the total N loss; while particulate P was the primary P form in the runoff, contributing to 67.5% of the total P loss. The N and P loads in CC were 3.01 and 4.03 times larger than those in AC, respectively, and the loss intensity of N and P in CC were 1.88 and 2.51times greater than those in AC, respectively. Therefore, the control of N and P losses from the compound catchments could be critical for the non-point source pollution control in hilly areas of central Sichuan in the future.

Key words： nitrogen phosphorus loss intensity underlying surface catchment

Received: 02 December 2021

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	XU Guang-zhi
	SHAO Zhi-jiang
	WANG Tao
	HUANG Mei-yu
	LI Ming-ming

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XU Guang-zhi,SHAO Zhi-jiang,WANG Tao等. Patterns of nitrogen and phosphorus losses in two catchments with contrasting underlying surfaces[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3334-3342.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3334

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