| 高强度农业种植区不同景观池塘氧化亚氮排放特征 |
| 摘要点击 2248 全文点击 593 投稿时间：2023-04-25 修订日期：2023-06-26 |
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| 中文关键词 农业活动 池塘水体 N2O排放 时空变化 影响因素 |
| 英文关键词 agricultural activity pond water N2O emissions spatial-temporal variability influencing factors |
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| 中文摘要 |
| 农业流域水体氮循环过程与农业活动有着十分紧密联系,会随着农业活动的持续进行而成为大气N2O的重要排放源.小型池塘具有灌溉、蓄水和纳污等多种功能,是农业种植区和农村景观的重要组成部分.以巢湖北岸典型农业流域烔炀河流域为研究对象,选取3种不同类型（村塘、农塘和水塘）,共计6个池塘,于2020年9月至2021年9月连续采样观测,探究了农业流域不同景观池塘N2O排放特征及其影响因素.结果表明,用于生活污水承纳的村塘N2O排放最高,其次为用于农业灌溉的农塘,其N2O排放通量分别为流域自然水塘排放量[（1.33±2.50） μmol·（m2·d）-1]的8倍和4倍.连续观测表明不同景观池塘N2O排放表现出明显的时间变化特征,但其N2O排放时间变化的调控因子有所不同.其中,村塘与农塘N2O排放主要受氮负荷和降雨影响,而远离村庄农田的水塘N2O排放变化主要受水温驱动.烔炀河流域池塘是大气N2O显著排放源,年均N2O排放通量为（5.73±10.61） μmol·（m2·d）-1,农业氮负荷输入是其N2O高排放的主要原因,明晰池塘用途和类型对估算农业流域小型水体N2O排放十分重要. |
| 英文摘要 |
| The nitrogen cycle of water bodies in agricultural watersheds is closely related to the farmland ecosystem, which will become a significant emission source of atmospheric N2O with increasing agricultural activity. Ponds are an important component of agricultural catchment due to their functions as water storage, domestic sewage receiving, and irrigation. In this study, Tongyang River Catchment, a typical agricultural catchment on the northern part of Chaohu Lake, was selected as the research object. Three different types of landscape ponds （sewage pond, irrigation pond, and storage pond） with a total number of six ponds were selected to investigate the N2O emissions based on continuous field sampling from September 2020 to September 2021. The results showed that the highest N2O emission flux occurred in sewage ponds, followed by the irrigation pond, and the N2O emissions fluxes in the sewage pond and irrigation pond were eight times and four times higher than that in storage ponds [（1.33±2.50） μmol·（m2·d）-1], respectively. Continuous observation showed that N2O emissions in different landscape ponds showed obvious temporal variation, but the factors influencing the N2O emissions varied among ponds. The N2O emissions from sewage ponds and irrigation pond were mainly affected by nitrogen load and precipitation, whereas N2O emissions from ponds away from villages and farms were mainly affected by water temperature. In summary, the ponds acted as significant emission sources of atmospheric N2O emissions, with an annual mean N2O emissions flux of （5.73 ± 10.61） μmol·（m2·d）-1. Large exogenous nitrogen load input from the catchment contributed to significant N2O emissions. Clarifying the use and type of ponds is important for estimating N2O emissions from small-scale water bodies in agricultural watersheds. |
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