农田溪流深潭营养盐滞留及对人为干扰的响应

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Abstract From November 2015 to April 2016, nine field tracer experiments including four human disturbance scenarios were conducted in an agricultural headwater stream of Nanfei River, located in Chaohu Lake basin. To explore the nutrient retention efficiencies and its response to human disturbance for multi-pool morphological pattern in streams, conservative (NaCl) and non-conservative (NH₄Cl and KH₂PO₄) solutes were co-injected at a constant rate. Based on the tracer experiments, hydraulic parameters and nutrient spiraling metrics were calculated. Test stream reach displayed striking turbulence characteristics through the nine tracer experiments and its flow belonged to subcritical flow. The decrease of S_w-NH₄ (NH₄⁺ uptake lengths) in the deep pool under human disturbances was significant with a drop from 331~3₃0₄m to 232~609m, while the PO₄^3- uptake lengths S_w-PO₄ increased slightly with a raise from 232~609m to 301~1100m.The S_w-NH₄ decreased sharply from 4812~58895m to 2463~13955m, and the S_w-PO₄ also dropped markedly from 6242~75285m to 1792~11432m, in the straight sub-reach in the case of human disturbances. The falling ranges of S_w-NH₄ and S_w-PO₄ in the straight sub-reach greatly exceeded that in the pool sub-reach under human disturbances, suggesting that the straight sub-reach was highly affected by the human disturbance. Compared with the natural situation, the values of V_f-NH₄ and V_f-PO₄ both in straight and pool sub-reaches under human disturbances had an increase, which would be helpful to nutrient retention. From the point of the whole test stream, the effectiveness of human disturbance was feasible and effective for the improvement of nutrient retention efficiency.

Key words： pool agricultural headwater stream nutrient retention human disturbance nutrient spiraling metrics

Received: 03 June 2016

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X52

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	Articles by authors
	LI Ru-zhong
	GENG Ruo-nan
	HUANG Qing-fei
	QIAN Jing
	YANG Ji-wei
	QIN Ru-bin

Cite this article:

LI Ru-zhong,GENG Ruo-nan,HUANG Qing-fei等. Nutrient retention and responses to human disturbance in multi-pool morphological pattern in an agricultural headwater stream[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(2): 720-729.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I2/720

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