| 我国南方两个典型森林生态系统的硫、氮和汞沉降量 |
| 摘要点击 1945 全文点击 683 投稿时间：2017-05-11 修订日期：2017-06-28 |
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| 中文关键词 酸沉降 汞沉降 干沉降 湿沉降 穿透水 |
| 英文关键词 acid deposition mercury deposition dry deposition wet deposition throughfall |
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| 中文摘要 |
| 利用混合降水采样器，对江西千烟洲和湖南会同两个森林生态站的大气硫、氮和汞的湿沉降和穿透水沉降进行了为期1 a的观测.在2013-12~2014-11的观测期间，千烟洲站降水中的SO42--S、NO3--N、NH4+-N和Hg的体积加权平均质量浓度分别为1.89 mg·L-1、0.957 mg·L-1、0.401 mg·L-1和12.5 ng·L-1，而穿透水中的平均浓度分别为2.39 mg·L-1、1.18 mg·L-1、0.897 mg·L-1和22.2 ng·L-1，穿透水浓度较降水有不同比例的增加.会同站穿透水中的元素平均浓度则分别为2.93 mg·L-1、1.60 mg·L-1、0.502 mg·L-1和22.0 ng·L-1.基于穿透水的千烟洲站大气硫、氮和汞的沉降量分别为3.56 g·（m2·a）-1、3.02 g·（m2·a）-1和30.6 μg·（m2·a）-1，会同站分别为6.18 g·（m2·a）-1、4.48g·（m2·a）-1和37.3μg·（m2·a）-1，三者均在夏季达到最高.汞的干湿沉降量相当，而硫和氮的湿沉降量在总沉降量中占主导地位.与硫沉降和氮沉降主要来自人为源不同，自然源对汞沉降的贡献较明显，特别是在会同站. |
| 英文摘要 |
| Bulk precipitation collectors and canopy throughfall collectors were applied to measure the deposition of sulfur, nitrogen, and mercury at two forest ecology stations, Qianyanzhou (QYZ) in Jiangxi Province and Huitong (HT) in Hunan Province, from December 2013 to November 2014. During the observation period, the volume weighted average concentrations of SO42--S, NO3--N, NH4+-N, and Hg at QYZ station were 1.89 mg·L-1, 0.957 mg·L-1, 0.401 mg·L-1, and 12.5 ng·L-1 in the bulk precipitation, respectively, and 2.39 mg·L-1, 1.18 mg·L-1, 0.897 mg·L-1, and 22.2 ng·L-1 in the throughfall, respectively. The concentrations of these components increased by different proportions for the bulk precipitation compared to the throughfall. At HT station, the average concentrations of SO42--S, NO3--N, NH4+-N, and Hg in the throughfall were 2.93 mg·L-1, 1.60 mg·L-1, 0.502 mg·L-1, and 22.0 ng·L-1, respectively. In addition, atmospheric deposition fluxes based on the throughfall were 3.56 g·(m2·a)-1 for sulfur, 3.02 g·(m2·a)-1 for nitrogen, and 30.6 μg·(m2·a)-1 for mercury at QYZ station, while the corresponding fluxes were 6.18 g·(m2·a)-1, 4.48 g·(m2·a)-1, and 37.3 μg·(m2·a)-1 at HT station. The deposition rates of all three elements were the highest in summer. The contribution of dry deposition to the total deposition of mercury was similar to that of wet deposition, while wet deposition contributed more to the total deposition of sulfur and nitrogen than did dry deposition. Unlike sulfur and nitrogen depositions, which were mainly derived from anthropogenic sources, mercury deposition might have a greater contribution from natural sources, especially at HT station. |
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