期刊
ATMOSPHERIC RESEARCH
卷 101, 期 1-2, 页码 460-468出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.atmosres.2011.04.011
关键词
N deposition; NH4+/NO3- ratio; Precipitation; Agroecosystems; Ecological disturbance; Critical loads; Lower Liaohe River Plain, Northeast China
资金
- National Natural Science Foundation of China [31070547, 31000206]
- National Key Technology R D Program [2007BAD89B02]
Little information about the nitrogen (N) deposition in the lower Liaohe River Plain (LRP) of Northeast China was available. A continuous 5-year observation (from 2004 to 2008) was conducted to determine the nitrogen deposition in precipitation collected by a standard rain gage, and then we assessed its ecological consequences. The mean inorganic nitrogen concentrations were 1.82 mg N L-1 for NH4+-N and 0.89 mg N L-1 for NO3--N. On an annual basis, the averaged amounts of N deposition were 14.5 kg N ha(-1) year(-1), which were much lower than that of hotspots in China. However, the amount of deposited N should still be taken account into the N fertilizer management of the agroecosystems. Compared with the critical loads (CL) of N deposition, the deposited N would likely threaten the natural ecosystems in LRP. The N concentrations in rainwater and the amount of N deposition showed a clear seasonal pattern, and precipitation played an important role in regulating the N concentration. Furthermore, the seasonal fluctuation of NH4+/NO3- ratio reflected that the deposited N originated from both fertilizer application and fossil fuel combustion, and environmental factor (soil temperature, lightning and sunshine) might also contribute to the seasonal cycles of NH4+/NO3- ratio. The high annual NH4+/NO3- ratio (2.05) compared with the more developed region suggested that N deposition in this region was mostly affected by agricultural activities rather than industrial activities. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
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