Estimation of critical nutrient amounts based on input-output analysis in an agriculture watershed of eastern China
Estimation of critical nutrient amounts based on input-output analysis in an agriculture watershed of eastern China
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DOI：
10.1016/j.agee.2009.06.011
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发表时间：
2009-12
期刊：
影响因子：
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通讯作者：
Dingjiang Chen;Jun Lu;Ye-na Shen;R. Dahlgren;Shu-quan Jin
中科院分区：
文献类型：
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作者：
Dingjiang Chen;Jun Lu;Ye-na Shen;R. Dahlgren;Shu-quan Jin
提出了流域临界营养盐量（CNA）的概念，以解决地表水沃茨因面源污染而引起的富营养化问题。CNA的定义是来自自然和人类来源的营养素的最大允许应用或产生量（阿加），该营养素可以排放，并且仍然允许符合水质标准。CNA计算方法基于扩散源污染的特性，包括（i）陆地和河流系统中营养物输入-输出平衡的估计和分析;（ii）使用河流负荷预测陆地营养物输出负荷和阿加;以及（iii）计算临界阿加以满足不同的法规合规位置（例如，一个河段的末端或整个河段）。以中国东部昌乐流域（864 km ~ 2/27.8km河段）为例，对流域总氮（TN）和总磷（TP）的CNA概念进行了发展、验证和应用。结果表明，末端控制法的CNA为7174 tNy − 1和5004 tPy − 1，全河段控制法的CNA为8290 tNy − 1和4425 tPy − 1。2004 ~ 2006年，全河段和末端控制法的总氮阿加年平均值分别超过总氮年平均值53.2-61.3%和46.0-55.2%。相比之下，TP阿加值分别为90.3-95.9%和68.3-73.2%，低于CNA值的达到端和整个达到控制方法。这些计算提供了一个目标或允许的营养量，可用于制定管理措施，使水质目标的实现在流域规模。
The concept of critical nutrient amounts (CNA) for a watershed was developed to address eutrophication in surface waters from diffuse (non-point) source pollution. CNA is defined as the maximum allowable applied or generated amount (AGA) of a nutrient from natural and human sources that can be emitted and still allow compliance with water quality standards. The CNA calculation method is based on properties of diffuse source pollution, including (i) estimation and analysis of nutrient input–output balances in terrestrial and riverine systems; (ii) prediction of terrestrial nutrient export loads and AGA using riverine loads; and (iii) calculation of critical AGA to meet different regulatory compliance locations (e.g., end of a reach or for the whole reach). The CNA concept was developed, validated and applied for total nitrogen (TN) and phosphorus (TP) in the ChangLe agriculture-dominated watershed (864km2/27.8km reach) of eastern China. Results indicated that CNA was 7174tNy−1and 5004tPy−1for the reach-end control method and 8290tNy−1and 4425tPy−1for the whole-reach control method. Annual TN AGA exceeded CNA by 53.2–61.3% and 46.0–55.2% for reach-end and whole-reach control methods in 2004–06, respectively. In contrast, TP AGA values were 90.3–95.9% and 68.3–73.2% below CNA values for reach-end and whole-reach control methods, respectively. These calculations provide a target or permissible nutrient amount that can be used to develop management practices that allow attainment of water quality objectives at the watershed scale.