Atmospheric deposition as an important nitrogen load to a typical agroecosystem in the Huang-Huai-Hai Plain. 1. Measurement and preliminary results

详细信息    查看全文

• 作者：Ping Huang^a ; ^b ; Jiabao Zhang^a ; ^{jbzhang@mail.issas.ac.cn"" rel=""nofollow} ; Anning Zhu^a ; Xiuli Xin^a ; Congzhi Zhang^a ; ^b ; Donghao Ma^a
• 关键词：Atmospheric nitrogen (N) deposition ; Water surface sampler ; Agroecosystem ; Huang-Huai-Hai Plain
• 刊名：Atmospheric Environment
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：45
• 期：20
• 页码：3400-3405
• 全文大小：427 K

文摘

Atmospheric nitrogen (N) deposition has been widely considered as an important N input into agroecosystems, but its measurement involves considerable uncertainties with various methods. In this study, a field sampler with distilled water as a surrogate surface was developed and trialed for the collection of dry and wet N deposition. The direct measuring results were compared with the value calculated by the N mass balance method (crop N uptake from plots receiving no N fertilizers of the long-term fertilization experiment in the monitoring station). The results indicated that exposure durations of 3–5 days and water volumes of 2000–2800 ml were tested to be suitable to collect dry N deposition, while water volumes of less than 1000 ml and sampling conducted immediately after rain event were found to be appropriate for wet N collection under the present experimental conditions. The monitoring work was conducted from June 2008 to May 2009, and annual N deposition totaled up to 40.32 kg N ha⁻¹, of which dry deposition accounted for 62.45 % . NH₄–N was the dominant species in N deposition and contributed 62.68 % and 66.00 % to wet and dry deposition, respectively. Organic N (O-N) was found to make greater contributions than NO₃–N in both dry and wet depositions. Total N deposition was parallel to the results estimated by the method of mass N balance from the long-term experiment, as 45.6 kg N ha⁻¹. These results provide helpful knowledge to elucidate the N deposition scenario of a typical agroecosystem and can be of great importance for the calculation of fertilizer recommendations in the Huang-Huai-Hai Plain.