Atmospheric nitrogen deposition to forest and estuary environments in the Pearl River Delta region, southern China
Atmospheric nitrogen deposition to forest and estuary environments in the Pearl River Delta region, southern China
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DOI：
10.3402/tellusb.v65i0.20480
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发表时间：
2013-09
期刊：
影响因子：
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通讯作者：
Xuemei Wang;Zhiyong Wu;M. Shao;Yunting Fang;Leiming Zhang;Fei Chen;Pak-wai Chan;Q. Fan;Qian Wang;Shengjie Zhu;Ruoyu Bao
中科院分区：
文献类型：
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作者：
Xuemei Wang;Zhiyong Wu;M. Shao;Yunting Fang;Leiming Zhang;Fei Chen;Pak-wai Chan;Q. Fan;Qian Wang;Shengjie Zhu;Ruoyu Bao
由于其严重的生态和气候后果，大气氮沉降日益受到全球的关注，特别是在氮污染严重的地区，如中国南部的珠江三角洲地区。2006-2007年在珠江三角洲西北部天然林场鼎湖山(DHS)和珠江三角洲南部河口横门(HM)，利用自动干湿采样器和DDAS(水面干沉降物)采样装置，对珠江三角洲西北部天然林地鼎湖山(DHS)和珠江三角洲南部河口(HM)进行了为期一年的干、湿沉降中活性氮(-N)、硝态氮(-N)和总有机氮(ON)的测定。N的总沉积通量在DHS和HM分别高达48.2kha−和37.8kgha−1yr 1，大部分沉积发生在雨季。以湿沉降为主，占总沉降量的65-70%。-由于农业排放的显著影响，氮是国土安全部总氮沉降量的最大贡献者(47%)。On是HM中最重要的N组分(41%)，这可能归因于海洋来源。然而，-N沉降量最近正在迅速增加，预计在不久的将来将更加重要。目前珠江三角洲的氮沉降水平远高于欧洲和北美。在减少该地区的反应性氮排放方面存在巨大的挑战。因此，不能排除在不久的将来珠江三角洲氮沉降上升的可能性。因此，未来应更多地关注氮沉降增加所造成的环境后果。
Due to its significant ecological and climate consequences, atmospheric nitrogen (N) deposition is a growing global concern, especially in the severely N-polluted regions such as the Pearl River Delta (PRD) region of southern China. One-year measurements of reactive N species, including ammonium nitrogen ( -N), nitrate nitrogen ( -N) and total organic nitrogen (ON) in dry and wet deposition, were conducted using an automated wet–dry sampler incorporated with a DDAS (dry deposition on aqueous surface) sampling device at Dinghushan (DHS), a natural forest site in the northwest of PRD and at Hengmen (HM), an estuary site in the south of PRD during 2006–2007. Total deposition fluxes of N at DHS and HM were up to 48.2 and 37.8 kg ha−1 yr−1, respectively, with most of the deposition occurring in the rainy season. Wet deposition was the dominant form, contributing 65–70% to the total deposition. -N was the largest contributor to the total N deposition at DHS (47%) due to significant influence of agriculture emissions. ON was the most important N component at HM (41%), which is probably attributed to the marine sources. However, -N deposition is increasing rapidly recently and is expected to be more important in the near future. The current N deposition level in PRD is much higher than those in Europe and North America. Great challenges exist in reducing reactive N emission in this region. Thus, a scenario of rising N deposition in PRD in the near future cannot be ruled out. The environmental consequences due to elevated N deposition should therefore be paid more attention in the future.