Quantification of nitrogen load in a regulated river system in Vietnam by material flow analysis
Quantification of nitrogen load in a regulated river system in Vietnam by material flow analysis
复制标题
通过物质流分析量化越南调节河流系统中的氮负荷
DOI：
10.1007/s10163-019-00855-z
复制
发表时间：
2019
影响因子：
3.1
通讯作者：
K. Nishida
中科院分区：
文献类型：
--
作者：
T. Do;Viet;A. Trinh;K. Nishida
在这项研究中，通过现场观察和物质流分析 (MFA) 的应用，对越南 Day-Nhue 河流域 (DNRB) 的氮 (N) 负荷进行了量化（在流域和省级范围内）。通过绘制 L(Q) 曲线，根据水位数据和河流的氮含量估算测得的氮负荷。 MFA 对从 DNRB 到北部湾的氮负荷进行了量化。对应于2008年至2010年的累计降雨量，MFA结果与实测值之间的差距从4.48%增加到21.47%。结果表明，MFA可以估算流域对地表水的潜在氮负荷。观测到的上游和下游河流荷载范围分别为 55-84% 和 5-20%，与 MFA 的估计值吻合较好。 MFA 可有效量化下游地区地表水的氮负荷，这些地区主要用于水稻农业。通过 MFA 追踪了原始氮源，发现减少化肥施用量和在排放到地表水之前对排水进行预处理可以减少从 DNRB 到地表水的氮负荷。此外，MFA 还发现 DNRB 上游部分存在隐藏流，这意味着测量数据被低估。
In this study, nitrogen (N) loads in Day-Nhue River Basin (DNRB) in Vietnam were quantified (at river basin and province scale) via field observation and application of material flow analysis (MFA). By developing L(Q) curves, measured N loads were estimated from water level data and N content of rivers. N loads from DNRB to Tonkin Gulf were quantified by MFA. The gaps between MFA results and measurements were increased from 4.48 to 21.47% corresponding to the accumulative rainfall from year 2008 to 2010. Results illustrate that MFA can estimate potential N load across the river basin to surface water. Observed ranges in upstream and downstream river loads were different at 55–84% and 5–20% respectively, corresponding well with those estimated by MFA. MFA is effective at quantifying N load to surface water the downstream regions, which are mainly used for paddy agriculture. Original N sources were traced via MFA, identifying that decreasing chemical fertilizer application rates and pretreatment of drainage water before discharging to the surface water reduce N load from the DNRB to the surface water. Additionally, MFA identified a hidden flow in the upstream portion of the DNRB, which meant that measurement data were under-estimated.