Organic nitrogen uptake is a significant contributor to nitrogen economy of subtropical epiphytic bryophytes.
Organic nitrogen uptake is a significant contributor to nitrogen economy of subtropical epiphytic bryophytes.
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有机氮吸收是亚热带附生苔藓植物氮经济的重要贡献者
DOI：
10.1038/srep30408
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发表时间：
2016-07-27
影响因子：
4.6
通讯作者：
Liu WY
中科院分区：
文献类型：
--
作者：
Song L;Lu HZ;Xu XL;Li S;Shi XM;Chen X;Wu Y;Huang JB;Chen Q;Liu S;Wu CS;Liu WY
没有任何根与土壤接触，附生brabrites必须经历和探索穷人，斑块，和异质性的栖息地，而这些生物体的氮（N）的吸收和使用策略仍然是未知的，这掩盖了他们在N循环中的作用。为了研究氮的来源，氮的偏好，以及对增强的N沉积在附生brabrites的反应，我们进行了原位操作实验，通过15 N标记技术在亚洲云雾林。树附生植物从大气沉降中获得的氮素多于树皮，但树皮的氮素贡献不可忽略。甘氨酸占叶片全氮的28.4%~ 44.5%，表明有机氮是叶片氮素的重要来源。增加氮沉积增加总氮吸收，但没有改变的N偏好的附生brabrites。本研究为附生苔藓植物从树皮和湿沉降中吸收有机态和无机态氮提供了有力的证据。因此，重要的是要考虑有机N和树皮N的来源，这通常被忽视，在估算的作用，附生brabrites在N循环和N沉积的影响，附生brabrites在云雾林。
Without any root contact with the soil, epiphytic bryophytes must experience and explore poor, patchy, and heterogeneous habitats; while, the nitrogen (N) uptake and use strategies of these organisms remain uncharacterized, which obscures their roles in the N cycle. To investigate the N sources, N preferences, and responses to enhanced N deposition in epiphytic bryophytes, we carried out an in situ manipulation experiment via the 15N labelling technique in an Asian cloud forest. Epiphytic bryophytes obtained more N from air deposition than from the bark, but the contribution of N from the bark was non-negligible. Glycine accounted for 28.4% to 44.5% of the total N in bryophyte tissue, which implies that organic N might serve as an important N source. Increased N deposition increased the total N uptake, but did not alter the N preference of the epiphytic bryophytes. This study provides sound evidence that epiphytic bryophytes could take up N from the bark and wet deposition in both organic and inorganic N forms. It is thus important to consider organic N and bark N sources, which were usually neglected, when estimating the role of epiphytic bryophytes in N cycling and the impacts of N deposition on epiphytic bryophytes in cloud forests.