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Agricultural non-point nitrogen pollution control function of dierent vegetation types in riparian wetlands: A case study in the Yellow River wetland in China

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Journal of Environmental Sciences 2009年第7期21卷 933-939页

作者： ZHAO Tongqian XU Huashan HE Yuxiao TAI Chao MENG Hongqi ZENG Fanfu XING Menglin Institute of Resources and Environment Henan Polytechnic University Jiaozuo 454003 China Henan Province Environmental Monitoring Center Zhengzhou 450004 China

Riparian wetland is the major transition zone of matter, energy and information transfer between aquatic and terrestrial ecosystems and has important functions of water purification and non-point pollution control. Using the field experiment method and an isotope tracing technique, the agricultural non-point nitrogen pollution control function of different vegetation types in riparian wetland was studied in the Kouma Section of the Yellow River. The results showed that the retention of agricultural non-point nitrogen pollution by riparian wetland soil occurs mainly in top 0-10 cm layer. The amount of nitrogen retained by surface soils associated with three types of vegetation are 0.045 mg/g for Phragmites communis Trin Linn, 0.036 mg/g for Scirpus triqueter Linn, and 0.032 mg/g for Typha angustifolia Linn, which account for 59.21%, 56.25%, and 56.14% of the total nitrogen interception, respectively. Exogenous nitrogen in 0-10 cm soil layer changes more quickly than in other layers. One month after adding KISNO3 to the tested vegetation, nitrogen content was 77.78% for P communis Trin, 68.75% for T. angustifolia, and 8.33% for S. triqueter in the surface soil. After three months, nitrogen content was 93.33% for P. communis Trin, 72.22% for S. triqueter, and 37.50% for T. Angustifolia. There are large differences among vegetation communities respecting to purification of agricultural non-point nitrogen pollution. The nitrogen uptake amount decreases in the sequence： new shoots ofP. communis Trin （9.731 nag/g）〉 old P. communis Trin （4.939 mg/g）〉 S. triqueter （0.620 mg/g）〉 T. angustifolia （0.186 mg/g）. Observations indicated that the presence of riparian wetlands as buffers on and adjacent to stream banks could be recommended to control agricultural non-point pollution.

关键词： riparian wetland vegetation community agricultural non-point source nitrogen pollution

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Sensitivity analysis for the total nitrogen pollution of the Danjiangkou Reservoir based on a 3-D water quality model

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Frontiers of Structural and Civil Engineering 2017年第4期11卷 609-619页

作者： Libin CHEN Zhifeng YANG Haifei LIU State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China Key Laboratory of Ministry of Water Resources for Ecological Impacts of Hydraulic-projects and Restoration of Aquatic Ecosystem Institute of Hydroecology Ministry of Water Resources & Chinese Academy of Sciences Wuhan 430079 China

Inter-basin water deal of nitrogen are great transfers containing a great threats to human health, biodiversity, and air and water quality in the recipient area. Danjiangkou Reservoir, the source reservoir for China＇s South-to-North Water Diversion Middle Route Project, suffers from total nitrogen pollution and threatens the water transfer to a number of metropolises including the capital, Beijing. To locate the main source of nitrogen pollution into the reservoir, especially near the Taocha canal head, where the intake of water transfer begins, we constructed a 3-D water quality model. We then used an inflow sensitivity analysis method to analyze the sig- nificance of inflows from each tributary that may contribute to the total nitrogen pollution and affect water quality. The results indicated that the Han River was the most significant river with a sensitivity index of 0.340, followed by the Dan River with a sensitivity index of 0.089, while the Guanshan River and the Lang River were not significant, with the sensitivity indices of 0.002 and 0.001, respectively. This result implies that the concentration and amount of nitrogen inflow outweighs the geographical position of the tributary for sources of total nitrogen pollution to the Taocha canal head of the Danjiangkou Reservoir.

关键词： nitrogen pollution 3-D water quality model sensitivity analysis Danjiangkou Reservoir South-to-North Water Diversion Project

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Shifts in the bacterial community caused by combined pollutant loads in the North Canal River, China

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Journal of Environmental Sciences 2023年第5期127卷 541-551页

作者： Shengguang Yuan Wenqiang Zhang Wenye Li Zhenhan Li Minshan Wu Baoqing Shan State Key Laboratory of Environmental Aquatic Chemistry Research Centre for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Beijing Forestry University Beijing 100083China Hebei University of Engineering Handan 056038China

A typical anthropogenically disturbed urban river polluted by a combination of conventional pollutants(nitrogen and phosphorus pollution)and heavy metals was investigated along a 238 km *** in the bacterial community were evaluated using high-throughput sequencing,and the relationships between bacteria,heavy metals,and conventional pollutants were *** was large spatial heterogeneity in the bacterial community along the river,and bacterial diversity in the upstream and midstream sections was much higher than in the downstream *** metals and conventional pollutants both exhibited close correlations with bacterial diversity and *** instance,potential fecal indicator bacteria,sewage indicator bacteria and pathogenic bacteria,such as Ruminococcus and Pseudomonas,were closely associated with Cu,Zn,and NH_(4)^(+)-*** than conventional pollutants,heavy metals were the main driving factors of the microbial community *** results confirm that bacterial communities play a crucial role in biogeochemical ***,heavymetals could be used as biomarkers of complex pollution to indicate the pollution status of riverine ecosystems and contribute to the restoration of habitats in anthropogenically disturbed urban rivers.

关键词： Bacterial community Heavy metal nitrogen pollution Bioindicator

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Anammox bacterial abundance and biodiversity in greenhouse vegetable soil are influenced by high nitrate content

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Pedosphere 2020年第3期30卷 343-351页

作者： Hongyi QIN Huan DENG Cheng HAN Wenhui ZHONG School of Geography Science Nanjing Normal UniversityNanjing 210023China School of Environment Nanjing Normal UniversityNanjing 210023China Jiangsu Provincial Key Laboratory of Materials Cycling and pollution Control Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and ApplicationNanjing 210023China

The anaerobic ammonium oxidizing(anammox) process has been found to play an important role in terrestrial ecosystems in recent years. However,the diversity and abundance of anammox bacteria in nitrogen(N)-rich agricultural soils under high fertilizer greenhouse conditions are still unclear. Two greenhouse fields with different N fertilizer input levels were chosen, and their soil profiles were studied with molecular technologies, including quantitative polymerase chain reaction assay, a clone library, and phylogenetic analysis based on hzsB(encoding anammox hydrazine synthase β-subunit) gene. Molecular analyses suggested that anammox bacteria were at their highest density at 10–20 cm soil depth, and that the anammox bacterial abundance was significantly lower at high N than at low N. Candidatus Brocadia was the sole anammox bacterial genus throughout the soil depth profiles. The highest diversity of anammox bacteria was found at 30–40 cm soil depth, and different phylotypic clusters of Candidatus Brocadia were associated with specific soil environmental factors, such as nitrates, soil depth, and total N. Correlation analyses and redundancy analyses confirmed that high nitrate content associated with high N fertilizer input had a significant negative influence on the abundance and biodiversity of anammox bacteria. These results imply that excessive use of N fertilizer would affect arid land soil N loss to the atmosphere by the anammox pathway.

关键词： anammox pathway community structure fertilizer input level greenhouse soil hydrazine gene nitrogen fertilizer nitrogen pollution soil degradation

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PARAMETER ESTIMATION OF MULTI-CONSTITUENT WATER QUALITY MODEL FOR THE LIANGXI RIVER BY MARQUARDT METHOD

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Journal of Geographical Sciences 1994年第Z1期4卷 110-118页

作者： Liu Shuxia(Institute of Geography, CAS, Beijing 100101People’s Republic of China)

A multi-constituent water quality model is presented,Which relates carbonaceous biochemical oxygen demand (CBOD),amonia (NH3-N), nitrite(NO2-N), nitrate(NO3-N) and dissolvedoxygen(DO). The parameters are solved by Marquardt Method (i. e.,Dampled Least Square Method) while initial values inoptimization are produced by Monte-Carlo Method. The Potential ofthe method as a parameter estimation aid is demonstrated for theapplication to the Liangyi Rver, JiangSu Province of China and by aspecial comparison with Gauss Method.

关键词： nitrogen pollution water quality model parameter estimation Marquardt Method Monte-Carlo Method

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