| 王俊,黄洁钰,李方圆,王晓燕.潮河流域人类活动氮输入对河流硝态氮通量的影响[J].农业环境科学学报,2023,42(1):142-154. |
| 潮河流域人类活动氮输入对河流硝态氮通量的影响 |
| Influence of anthropogenic nitrogen input on river nitrate nitrogen flux in the Chaohe River watershed |
| 投稿时间：2022-03-31 |
| DOI：10.11654/jaes.2022-0315 |
| 中文关键词: 净人类活动氮输入 硝态氮通量 滞留氮 潮河流域 |
| 英文关键词: net anthropogenic nitrogen input nitrate nitrogen flux detained nitrogen Chaohe River watershed |
| 基金项目:北京市自然科学基金委员会－北京市教育委员会联合资助项目（KZ201810028047）；国家自然科学基金项目（41271495） |
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| 中文摘要: |
| 为了有效评估流域内人类活动氮输入量，并确定其对河流硝态氮通量的影响，本研究将净人类活动氮输入分为人为点源和非点源输入两部分，估算了1995-2014年人为点源和非点源氮输入量变化，构建了其与河流硝态氮通量的多元回归模型（R2=0.73），分析了该流域氮素输出及滞留的影响因素。结果显示，20年间潮河流域净人类活动氮平均输入量为5 569.27kg·km-2·a-1，其中非点源输入约占净人类活动氮输入量的76.87%，点源输入占23.13%。在非点源输入中化肥氮输入占净人类活动氮输入总量的比重最大，约为35.92%，其次是食品饲料氮输入，占21.12%，大气氮沉降占15.05%，种子氮输入和农业固氮分别占4.35%和0.43%。潮河流域河流平均硝态氮通量为115.94 kg·km-2·a-1，由人类活动导致的氮输入量约占潮河流域硝态氮通量的96.65%。流域内人类活动氮输入对河流氮通量影响较大，点源氮输入、化肥氮输入和种子氮输入是河流氮通量的主要来源。受水文气象及下垫面等因素影响，该流域滞留氮素对河流硝态氮通量的贡献率较大，多年平均占比为11.01%。 |
| 英文摘要: |
| In order to effectively evaluate the nitrogen input of human activities in the catchment and determine their effects on the fluxex of stream nitrate nitrogen. In this paper, the net nitrogen input from human activities was divided into two parts：anthropogenic point source and non-point source. By estimating the variation of anthropogenic nitrogen input from point sources and non-point sources from 1995 to 2014, a multivariate regression model of nitrate flux between them and the river（R2=0.73）was established. The influencing factors of nitrogen export and retention in the watershed were analyzed. The results showed that the average net nitrogen input of human activities in the Chaohe River watershed during the past 20 years was 5 569.27 kg · km-2 · a-1. The non-point and point source inputs accounted for 76.87% and 23.13% of the net nitrogen inputs, respectively, from human activities. Among non-point source inputs, fertilizer nitrogen input accounted for the largest proportion of the total net nitrogen input from human activities（35.92%）, followed by food and feed nitrogen input（21.12%）, atmospheric nitrogen deposition（15.05%）, seed nitrogen input（4.35%）, and agricultural nitrogen fixation（0.43%）. The average nitrate input to the Chaohe River watershed was 115.94 kg · km-2 · a-1 during the 20-year period. The nitrogen input caused by human activities accounted for 96.65% of nitrate flux in the river basin. Human input significantly influences the river nitrogen flux. Point source N input, fertilizer N input, and seed N input were the main sources of river flux. Affected by hydrometeorology and underlying surface factors, the contribution rate of retained nitrogen to nitrate flux was 11.01%. |
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