| 中亚热带典型林分不同层次氮硫湿沉降动态变化 |
| 摘要点击 2881 全文点击 1375 投稿时间：2014-05-30 修订日期：2014-07-14 |
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| 中文关键词 氮硫沉降 中亚热带 常绿阔叶林 层次 截留 |
| 英文关键词 deposition of nitrogen and sulfur mid-subtropical region evergreen broad-leaf forest storeys entrapment |
| 作者 | 单位 | E-mail | | 孙涛 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716 | suntao81589@126.com | | 马明 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | | | 王定勇 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | dywang@swu.edu.cn | | 黄礼昕 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716 | |
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| 中文摘要 |
| 基于野外定点监测的方法，于2012年9月~2013年8月对四面山常绿阔叶林大气降水、穿透水、枯透水、土壤渗滤液进行了持续1 a的氮、硫湿沉降动态变化的研究. 结果表明：四面山大气降水全年pH平均值为4.89，最大值为5.14，大气降水明显偏酸性；土壤层和林冠层能使降雨的pH值有所升高，其中土壤层对pH值的调升幅度最大，其次为森林冠层；森林冠层对NO3-、NO2-、SO42-有一定的吸附净化作用，平均截留率分别为56.68%、45.84%、35.51%；研究结果也表明：枯枝落叶的降解是导致各离子质量浓度在枯透水中增加的原因；森林土壤能够吸附中和NO3-、SO42-、NH4+，释放出NO2-. 中亚热带常绿阔叶林生态系统对大气降水中NO3-、NO2-、NH4+、SO42-的总截留率分别为92.86%、57.86%、87.24%、87.25%，对酸性降雨有一定的缓冲作用. |
| 英文摘要 |
| In order to investigate the dynamics of nitrogen and sulfur wet deposition in subtropical forest ecosystem, one typical forest stand, evergreen broad-leaved forest, at Simian Mountain located in Chongqing was selected in this research. Based on field monitoring, effects of precipitation, throughfall, litterfall, and groundwater runoff of the typical forest stand on the quality of water of Simian Mountain were investigated from September 2012 to August 2013. Results showed that the rainfall of Simian Mountain was apparently acidic, with average pH of 4.89 and maximum pH of 5.14. The soil, canopies and trunks could increase pH of precipitation, with soils having the maximum increment, followed by the forest canopy. Forest canopy had the function of adsorption and purification of NO3-, NO2- and SO42-, and the average entrapment rate was 56.68%, 45.84% and 35.51%, respectively. Moreover, the degradation of litter was probably the main reason for the increase of ion concentrations in the surface litter water. Forest soils could absorb and neutralize NO3-, SO42- and NH4+, and release NO2-. The evergreen broad-leaf forest of mid-subtropical region had the function of interception on NO3-, NO2-, NH4+ and SO42-, and the total entrapment rate was 92.86%, 57.86%, 87.24% and 87.25%, respectively, and it had a certain buffering function for the acid rain. |
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