Short-term Nitrogen (N)-Retranslocation within Larix olgensis Seedlings is Driven to Increase by N-deposition: Evidence from a Simulated N-15 Experiment in Northeast China
| 第一作者： |
魏红旭 |
| 英文第一作者： |
Wei, H. X. |
| 联系作者： |
徐程扬 |
| 英文联系作者： |
Xu, C. Y. |
| 发表年度： |
2014 |
| 卷： |
16 |
| 摘要： |
Urban areas are key sources of reactive atmospheric nitrogen (N). Urban forests are moving towards a state of "N-saturation" due to N-deposition. However, the possible future-trend of inherent N-cycling in trees in response to urbanization-related N-deposition is not well known. With regard to the contradiction of current studies on the exogenous N-addition on endogenous N-retranslocation (NR) in the month-or season-long term, we treated 15-month old Changbai larch (Larixo lgensis Henry.) seedlings with N-15-labeled ammonium sulfate supplied at rates of 0 (control), 30 (F30), 105 (F105), and 315 (F315) mg N-15 seedling(-1) to simulate N-deposition at the accumulatively future amounts driven by urbanization. Seedlings were harvested nine days after treatment to determine their response of NR. Results revealed that N-deposition had a significant short-term effect on N-derived from plant (NDFP) in needles, wherein NDFP rose with the increase of 15 N-deposition intensity. In fine root (in diameter of 0-1 mm) NDFP in the F315 treatment was statistically higher than that in other treatments. There was a mean amount of 1.26 mg of N-retranslocated into needles, which accounted for 19% of total N-content. Results in the present study, together with the other ones we summarized, could be concluded that short-term NR in Changbai larch tended to increase in response to urbanization-related N-deposition. |
| 刊物名称： |
International Journal of Agriculture and Biology |
| 参与作者： |
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