Direct uptake and rapid decrease of organic nitrogen by Wollemia nobilis |
| |
Authors: | Lili Wei Chengrong Chen Zhihong Xu Torgny Näsholm |
| |
Institution: | 1. Griffith School of Environment, Griffith University, Queensland, 4111, Australia 2. Environmental Futures Centre, Griffith University, Queensland, 4111, Australia 3. School of Bio-molecular and Physical Sciences, Griffith University, Queensland, 4111, Australia 4. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umea, 901 83, Sweden
|
| |
Abstract: | Organic nitrogen (N) can be directly taken up by many plants, particularly under low-temperature and N-limited conditions. The natural environment of Wollemia nobilis, shady conditions and shallow, acidic soils with high organic matter, led to the hypothesis that organic N might be a potential N source, although this species is living in a subtropical area. A pot experiment was carried out to investigate whether W. nobilis seedlings have the capability to take up intact organic N and whether the uptake of organic N contributes significantly to N acquisition for W. nobilis. Three 15N-labeled N forms, ammonium (NH4-N), nitrate (NO3-N), or glycine, were injected into soils separately, and the tissues of plants were then harvested 6 and 48 h after injection. Our results demonstrated that W. nobilis, a subtropical species, has the capability to take up intact glycine as indicated by the enrichment of 13C and 15N in fine roots at a nearly 1:1 ratio. The uptake rate of glycine-N was faster than that of inorganic N, but which was only restricted in the short term (6 h). The absorbed glycine-N reduced quickly (in 48 h), indicating that organic N uptake did not contribute greatly to N acquisition for W. nobilis. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|