Nutrient retention and responses to human disturbance in multi-pool morphological pattern in an agricultural headwater stream
LI Ru-zhong1, GENG Ruo-nan1, HUANG Qing-fei1, QIAN Jing2, YANG Ji-wei3, QIN Ru-bin1
1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; 2. Anhui Institute of Environmental Science, Hefei 230071, China; 3. Anhui and Huaihe River Institute of Hydraulic Research, Bengbu 233000, China
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 Sw-NH4 (NH4+ uptake lengths) in the deep pool under human disturbances was significant with a drop from 331~3304m to 232~609m, while the PO43- uptake lengths Sw-PO4 increased slightly with a raise from 232~609m to 301~1100m.The Sw-NH4 decreased sharply from 4812~58895m to 2463~13955m, and the Sw-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 Sw-NH4 and Sw-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 Vf-NH4 and Vf-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.
李如忠, 耿若楠, 黄青飞, 钱靖, 杨继伟, 秦如彬. 农田溪流深潭营养盐滞留及对人为干扰的响应[J]. 中国环境科学, 2017, 37(2): 720-729.
LI Ru-zhong, GENG Ruo-nan, HUANG Qing-fei, QIAN Jing, YANG Ji-wei, QIN Ru-bin. Nutrient retention and responses to human disturbance in multi-pool morphological pattern in an agricultural headwater stream. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(2): 720-729.
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