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    李登峰, 章家恩, 刘自强, 等. 模拟氮沉降对季风常绿阔叶林凋落物碳氮组分的影响[J]. 华南农业大学学报, 2018, 39(6): 70-76. doi: 10.7671/j.issn.1001-411X.2018.06.011
    引用本文: 李登峰, 章家恩, 刘自强, 等. 模拟氮沉降对季风常绿阔叶林凋落物碳氮组分的影响[J]. 华南农业大学学报, 2018, 39(6): 70-76. doi: 10.7671/j.issn.1001-411X.2018.06.011
    shu
    LI Dengfeng, ZHANG Jiaen, LIU Ziqiang, WANG Chi, YUAN Ai, WEI Hui. Effects of simulated nitrogen deposition on litterfall carbon and nitrogen fractions in a monsoon evergreen broad-leaved forest[J]. Journal of South China Agricultural University, 2018, 39(6): 70-76. DOI: 10.7671/j.issn.1001-411X.2018.06.011
    Citation: LI Dengfeng, ZHANG Jiaen, LIU Ziqiang, WANG Chi, YUAN Ai, WEI Hui. Effects of simulated nitrogen deposition on litterfall carbon and nitrogen fractions in a monsoon evergreen broad-leaved forest[J]. Journal of South China Agricultural University, 2018, 39(6): 70-76. DOI: 10.7671/j.issn.1001-411X.2018.06.011
    shu

    模拟氮沉降对季风常绿阔叶林凋落物碳氮组分的影响

    Effects of simulated nitrogen deposition on litterfall carbon and nitrogen fractions in a monsoon evergreen broad-leaved forest

      摘要
    • 摘要:
      目的  探究季风常绿阔叶林凋落物对氮沉降增加的响应规律。
      方法  设置4个氮添加水平：对照、低氮、中氮和高氮，其年添加氮量分别为0、35、70和105 kg·hm–2，分干、湿季收集凋落物样品，并进行碳、氮组分含量分析。
      结果  随氮添加量的上升，凋落物总有机碳(TOC)和水溶性有机碳(WSOC)含量显著增加，且WSOC/TOC质量比具有上升趋势。氮添加未显著改变酸不溶组分碳(AIFC)含量以及AIFC/TOC质量比，但与对照比较均具有下降趋势。不同的氮添加处理均未显著改变凋落物总氮(TN)、水溶性氮(WSN)和酸不溶组分氮(AIFN)含量，以及WSN和AIFN占TN的比例。短期氮添加对凋落物C/N质量比和AIFC/AIFN质量比无显著影响，但显著增加干季的WSOC/WSN质量比。
      结论  氮沉降促进了季风常绿阔叶林凋落物中可溶性有机碳的积累，这可能有利于可溶性有机物转入土壤中，从而影响生态系统中的养分循环。

       

      Abstract:
      Objective  To investigate responses of litterfall carbon (C) and nitrogen (N) fractions to atmospheric N deposition in a monsoon evergreen broad-leaved forest.
      Method  Three levels of N addition, including low N (LN, 35 kg·hm–2), medium N (MN, 70 kg·hm–2) and high N (HN, 105 kg·hm–2), were conducted for two years, with a control without extra N addition (CK). Fresh litterfall samples were collected in the dry and wet seasons, respectively. C and N fraction contents were analyzed.
      Result  N additions significantly increased the contents of total organic carbon (TOC) and water-soluble organic carbon (WSOC) in the wet season, with the WSOC/TOC ratio presenting a rising trend. N additions did not significantly alter acid-insoluble fraction carbon (AIFC) content and its proportion to TOC, although a decreasing trend was observed compared with the control. Different N addition treatments did not significantly change the contents of litterfall total nitrogen (TN), water-soluble nitrogen (WSN) and acid-insoluble fraction nitrogen (AIFN). The proportions of WSN and AIFN to TN were not altered significantly either. The short-term N additions did not significantly affect litterfall C/N ratio and AIFC/AIFN ratio, but significantly increased WSOC/WSN ratio in the dry season.
      Conclusion  The atmospheric N deposition promotes labile C accumulation and therefore is beneficial for litterfall decomposition to transfer nutrients into soil, which will further affect nutrient cycling in the tropical forest.

       

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