KMS Chongqing Institute of Green and Intelligent Technology, CAS
Atmospheric deposition as an important nitrogen load to a typical agro-ecosystem in the Huang-Huai-Hai Plain. 2. Seasonal and inter-annual variations and their implications (2008-2012) | |
Huang, Ping1,2,3; Zhang, Jiabao1; Ma, Donghao1; Wen, Zhaofei2; Wu, Shengjun2; Garland, Gina3; Pereira, Engil Isadora Pujol3; Zhu, Anning1; Xin, Xiuli1; Zhang, Congzhi1 | |
2016-03-01 | |
摘要 | Atmospheric nitrogen (N) deposition, an important N source to agro-ecosystems, has increased intensively in China during recent decades. However, knowledge on temporal variations of total N deposition and their influencing factors is limited due to lack of systematic monitoring data. In this study, total N deposition, including dry and wet components, was monitored using the water surrogate surface method for a typical agro-ecosystem with a winter wheat (Triticum aestivum L.) and summer maize (Zea mays L) rotation system in the Huang-Huai-Hai Plain from May 2008 to April 2012. The results indicated that annual total N deposition ranged from 23.8 kg N ha(-1) (2009-2010) to 40.3 kg N ha(-1) (2008-2009) and averaged 31.8 kg N ha(-1). Great inter-annual variations were observed during the sampling period, due to differences in annual rainfall and gaseous N losses from farmlands. Monthly total N deposition varied greatly, from less than 0.6 kg N ha(-1) (January, 2010) to over 8.0 kg N ha(-1) (August, 2008), with a mean value of 2.6 kg N ha(-1). In contrast to wet deposition, dry portions generally contributed more to the total, except in the precipitation-intensive months, accounting for 65% in average. NH4+N was the dominant species in N deposition and its contribution to total deposition varied from 6% (December, 2009) to 79% (July, 2008), averaging 53%. The role of organic N (O-N) in both dry and wet deposition was equal to or even greater than that of NO3--N. Influencing factors such as precipitation and its seasonal distribution, reactive N sources, vegetation status, field management practices, and weather conditions were responsible for the temporal variations of atmospheric N deposition and its components. These results are helpful for reducing the knowledge gaps in the temporal variations of atmospheric N deposition and their influencing factors in different ecosystems, to improve the understandings on N budget in the typical agro-ecosystem, and to provide references and recommendations for field nutrient management in this region. (C) 2016 Elsevier Ltd. All rights reserved. |
关键词 | Nitrogen Dry Deposition Nitrogen Wet Deposition Water Surrogate Surface Inter-annual Variations Agro-ecosystem Huang-huai-hai Plain |
DOI | 10.1016/j.atmosenv.2016.01.015 |
发表期刊 | ATMOSPHERIC ENVIRONMENT |
ISSN | 1352-2310 |
卷号 | 129页码:1-8 |
收录类别 | SCI |
WOS记录号 | WOS:000370886000001 |
语种 | 英语 |