Atmospheric nitrogen deposition in the Loess area of China
Atmospheric nitrogen deposition in the Loess area of China
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DOI：
10.1016/j.apr.2015.11.001
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发表时间：
2016-05-01
影响因子：
4.5
通讯作者：
Liu, Xuejun
中科院分区：
文献类型：
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作者：
Liang, Ting;Tong, Yan'an;Liu, Xuejun
采用长期野外观测（2006-2012）、盆栽试验（2009-2011）和长期定位试验（1991-2008）相结合的方法，对陕西省杨凌黄土区大气氮沉降进行了定量研究。研究结果表明，通过降水（湿沉降）和降尘（干沉降）的溶解性无机氮（NH 4 + - N和NO3- - N）的年沉降通量为12.73 ~ 37.87 kg N ha（-1）yr（-1），平均为21.76 kg N ha（-1）yr（-1），湿沉降的贡献很大。除2007年外，各研究年份铵态氮（NH 4 + - N）与硝态氮（NO3- - N）的年平均沉降量比值均小于1。根据盆栽试验中作物氮素吸收量（约52 kg N ha（-1）yr（-1））估算，干态氮沉降通量（包括气体和颗粒物）约为23.81 kg N ha（-1）yr（-1），占总氮沉降量的45.8%。长期定位试验结果表明，大气氮素输入农田的贡献占环境氮素输入的52.8%。研究结果表明，大气氮沉降是一个重要的氮输入，必须考虑在计算农业生态系统的养分收支。版权所有（C）2015土耳其国家空气污染研究和控制委员会。Elsevier B. V.制作和主持。保留所有权利。
We present the quantification information on atmospheric nitrogen (N) deposition in the Loess area in Yangling District of Shaanxi Province, China using combined methods of a long-term field measurement (2006-2012), a potted experiment (2009-2011) and a long-term site-specific experiment (1991-2008). Our results showed that the annual deposition fluxes of dissolved inorganic N (NH4+ - N and NO3- - N) via both precipitation (wet-deposition) and dustfall (dry-deposition) ranged from 12.73 to 37.87 kg N ha(-1) yr(-1) and averaged 21.76 kg N ha(-1) yr(-1), with large contributions from wet deposition. The annual mean ratios of deposition amounts of ammonium N (NH4+ - N) to nitrate N (NO3- - N) were less than 1 in all the study years with an exception of the year 2007. Based on crop N uptake (approximately 52 kg N ha(-1) yr(-1)) in the pot experiment, it was estimated that the dry N deposition fluxes (including gas and particles) was about 23.81 kg N ha(-1) yr(-1), accounting for 45.8% of the total N deposition. According the long-term site-specific experiment, the contribution of N input to farmland from the atmosphere was estimated to account for 52.8% of the environmental N input. Our results suggested that atmospheric N deposition was an important N input that must be taken into consideration when calculating nutrient budgets in agricultural ecosystems. Copyright (C) 2015 Turkish National Committee for Air Pollution Research and Control. Production and hosting by Elsevier B.V. All rights reserved.