| 李如忠,曹竟成,张瑞钢,金菊良,陈广洲.芦苇占优势农田溪流营养盐滞留能力分析与评估[J].水利学报,2016,47(1):28-37 |
| 芦苇占优势农田溪流营养盐滞留能力分析与评估 |
| Analysis and evaluation of nutrient retention efficiency in an agricultural headwater stream predominated by Phragmites australis |
| 投稿时间：2015-05-29 |
| DOI：10.13243/j.cnki.slxb.20150608 |
| 中文关键词: 农田源头溪流 大型水生植物 营养盐滞留 营养螺旋原理 OTIS 模型 |
| 英文关键词: agricultural headwater stream aquatic macrophyte nutrient retention nutrient spiraling theory OTIS model |
| 基金项目:国家自然科学基金项目(51179042,41471422,51579061) |
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| 中文摘要: |
| 2014年9 月—2015年4月,在合肥地区二十埠河流域的某一典型农田源头溪流段,选择以 NaCl为保守示踪剂,NH4Cl和 KH2PO4为添加营养盐,采用恒速连续投加的方式,开展了7次野外现场示踪试验。在此基础上,利用OTIS模型和营养螺旋原理,从机制层面分析和评估芦苇占优势农田源头溪流氮磷营养盐滞留能力和滞留特征。结果表明,该芦苇占优势渠段的比值 As/A 明显超过一般源头溪流水体,暂态存储对于营养盐滞留有较大影响;NH4+ 和 SRP 的暂态存储区营养盐一阶吸收系数都较主流区高一个数量级,且所有吸收系数均为正值,表明芦苇占优势渠段具有氮、磷“汇”的功能;NH4+吸收长度明显低于 SRP,特别是冬季和初春,意味着溪流对于NH4+的滞留能力超过 SRP; NH4+和SRP的总滞留率分别为 14.46%和10.73%, 生物滞留率平均值分别为 9.17%和3.67%;主流区流动水体和暂态存储区对于 NH4+滞留的平均贡献率分别为 43.12%、56.88%;对于SRP滞留的平均贡献率分别50.13%、49.87%。 |
| 英文摘要: |
| From September 2014 to April 2015,seven field tracer experiments,in which a solution of biologically active (NH4Cl and KH2PO4) and conservative (NaCl) tracers was added to the stream at a constant rate, were conducted in a typical agricultural headwater stream of Ershibu River in Hefei District. Based on the data sets of tracer experiments,retention efficiency and characteristics of ammonium and phosphorus were interpreted by using OTIS model code and nutrient spiraling theory. Study results show that the ratio of As/A in the steam predominated by Phragmites australis surpass other ordinary headwater streams, implying a great effect of the transient storage on nutrients retention. The values of first-order uptake rate coefficients for NH4+ and SRP in transient storage zone were all higher by an order of magnitude than that of main channel, and the positive of uptake rate coefficients suggested that the study reach even acted as a nutrient sink. The uptake lengths of Sw-NH4 was smaller than Sw-SRP, especially in winter and early spring, suggesting that the retention capacity for ammonium was better than that of SRP in the study reach. The total retention efficiency for NH4+ and SRP were 14.46% and 10.73%,respectively,and their biological retention efficiency were 9.17% and 3.67%, respectively. Estimates of mass loss indicated that the main channel and transient storage zone accounted for 43.12% and 56.88% of the NH4+ uptake, and 50.13% and 49.87% for SRP,respectively. |
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