雨强和坡度对裸地径流颗粒物及磷素流失的影响

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Abstract Artificial simulated rainfall experiments were conducted in this study to investigate the effects of rainfall intensity (30~100mm/h) and slope gradient (0~10°) on suspended substance (SS), total phosphorus (TP) and particulate phosphorus (PP) losses in runoff from bare land in north China. The relationships between SS, TP and PP losses were also studied. The results showed that SS and TP losses increased greatly with the increase of rainfall intensity and slope gradient. There was a significant linear relationship between SS and TP losses, as well as TP and PP losses (R²> 0.946). Rainfall intensity had more intensive influence on SS and P losses than slope gradient in the range of our experimental conditions. There were clear linear relationships between SS, P losses and the rainfall intensity, slope gradient and the total amount of runoff (R²> 0.911). The linear equations of SS, P losses from bare land with and without an incline should be separately simulated because the rainwater infiltration and the runoff generation pathway on 0degree and other slopes were distinctly different. The results provided a calculation method for estimating SS and P losses in runoff from sandy loam soil in north China.

Key words： rainfall intensity slope gradient bare land suspended substance phosphorus

Received: 16 February 2016

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	Articles by authors
	YUAN Xi
	PAN Zhong-cheng
	LI Min
	LIU Feng

Cite this article:

YUAN Xi,PAN Zhong-cheng,LI Min等. Influence of rainfall intensity and slope gradient on suspended substance and phosphorus losses in runoff[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(10): 3099-3106.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2016/V36/I10/3099

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