Risk Assessment of Nitrogen Discharge from a Coastal Watershed

CHEN Neng-Wang; HONG Hua-Sheng; ZHANG Luo-Ping; CAO Wen-Zhi

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Risk Assessment of Nitrogen Discharge from a Coastal Watershed

机译：沿海流域氮排放的风险评估

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Probabilistic risk assessment (PRA) uses probability theory to quantify the probability of occurrence of an event. In this study, PRA was conducted for the discharge of excess nitrogen (N) from an agricultural (Jiulong River) watershed in Southeast China. Using fault tree analysis, a type of PRA, the probability of occurrence of excess N discharge into the river during a runoff event was evaluated both qualitatively and quantitatively. Land use maps, soil maps, fertilizer use records, and expert opinions were used to determine probabilities of individual events within the fault tree and to calculate the overall probability of excess N discharge during a runoff event. Qualitative analysis showed that the risk of excess N discharge was mainly related to crop and livestock practices in the watershed. Proper management of tillage, fertilizer, and manure was necessary to control N releases. Quantitative assessment results indicated that alternative practices including reduction of fertilization, installation of vegetative strip buffer around the pig farms, and installation of more riparian buffers along the Jiulong River could reduce the likelihood of N discharge through runoff.

机译：概率风险评估（PRA）使用概率论来量化事件发生的概率。在这项研究中，PRA用于从中国东南部的一个农业（九龙河）流域排放过量的氮（N）。通过使用故障树分析（一种PRA），从定性和定量方面评估了径流事件中过量N排入河流的可能性。土地使用图，土壤图，肥料使用记录和专家意见被用来确定断层树内单个事件的概率，并计算径流事件中过量氮排放的总体概率。定性分析表明，过量排放氮的风险主要与流域的农作物和牲畜耕作有关。为了控制氮的释放，必须对耕作，肥料和肥料进行适当管理。定量评估结果表明，包括减少施肥，在养猪场周围安装植物性带状缓冲带以及在九龙河沿岸安装更多河岸缓冲带等替代措施可以减少氮素通过径流排放的可能性。

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《土壤圈（英文版）》 |2007年第4期|467-474|共8页
作者
CHEN Neng-Wang; HONG Hua-Sheng; ZHANG Luo-Ping; CAO Wen-Zhi;
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作者单位

Department of Environmental Science, Zhejiang University, Hangzhou 310028, China;

State Key Laboratory of Marine Environmental Science, Environmental Science Research Center, Xiamen University, Xiamen 361005 China;

State Key Laboratory of Marine Environmental Science, Environmental Science Research Center, Xiamen University, Xiamen 361005 China;

State Key Laboratory of Marine Environmental Science, Environmental Science Research Center, Xiamen University, Xiamen 361005 China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
N discharge; probabilistic risk assessment; runoff; watershed;

机译：氮素排放;概率风险评估;径流;分水岭;
入库时间 2022-08-19 04:04:15

Risk Assessment of Nitrogen Discharge from a Coastal Watershed

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