Organic nitrogen uptake is a significant contributor to nitrogen economy of subtropical epiphytic bryophytes
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作者: | Song L; Lu HZ | ||||||||
刊物名称: | Scientific Reports | ||||||||
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论文题目英文: | Organic nitrogen uptake is a significant contributor to nitrogen economy of subtropical epiphytic bryophytes | ||||||||
年: | Jul 2016 | ||||||||
卷: | 6 | ||||||||
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页: | 30408 | ||||||||
联系作者: | Song L; Liu WY | ||||||||
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影响因子: | 5.228 | ||||||||
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摘要: | 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. | ||||||||
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