| Research Articles |
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| Estimating total nitrogen deposition in agroecosystems in northern China during the wheat cropping season |
| ChunE HE, XueJun LIU, Christie PETER, Fangmeier ANDREAS, FuSuo ZHANG |
| 1 College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; 2 Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100193, China; 3 Xinjiang Institute of Ecology and Geology, Chinese Academy of Sciences, Urumqi 830011, China; 4 Agri-Environment Branch, Agri-Food and Biosciences Institute, Belfast BT9 5PX, UK; 5 Institute of Plant Ecology and Landscape, University of Hohenheim, Stuttgart, Germany |
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Abstract Atmospheric nitrogen (N) deposition has been poorly documented in northern China, an intensive agricultural and industrial region with large emissions of NHx and NOy. To quantify N deposition, total airborne N deposition was determined at three agricultural sites using a manual integrated total nitrogen input (ITNI) system during growth of winter wheat (Triticum aestivum L.) and Italian ryegrass (Lolium multiflorum Lam.) from September 2005 to May 2006. Total estimated N deposition averaged 54.9 and 43.2 kg N/hm2 across the three sites when wheat was grown to flowering and maturing, respectively. The average value was 50.2 kg N/hm2 when ryegrass was the indicator plant. Both indicator species gave similar total airborne N input results. The intermediate level of N supplied resulted in the highest N deposition, and the ratio of N acquired from deposition to total N content of the whole system decreased with increasing N supply to the roots. The contribution of atmospheric N to the total N content of the wheat and ryegrass sand culture systems ranged from 10% to 24%.
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Received: 12 December 2009
Published: 07 March 2010
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Corresponding Authors:
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