Whole-tree dynamics of non-structural carbohydrate and nitrogen pools across different seasons and in response to girdling in two temperate trees
文献类型：SCI/SSCI论文
| 作者 | Mei L.; Xiong, Y. M.; Gu, J. C.; Wang, Z. Q.; Guo, D. L. |
| 发表日期 | 2015 |
| 关键词 | C storage N storage Source-sink relation C limitation Root branch order fine-root architecture interspecific variation fraxinus-mandshurica tropical forest branch orders sugar content respiration storage allocation reserves |
| 英文摘要 | Despite extensive research on the seasonal dynamics of non-structural carbohydrate (NSC) and nitrogen (N) concentrations, the size and relative contributions of NSC and N pools across different tree organs are not well understood. We have measured the changes in NSC and N concentrations in leaves, branches, stems and all root branch orders at monthly intervals in control and girdled trees of larch (Larix gmelinii) and ash (Fraxinus mandshurica). The biomass of each plant compartment was also determined to calculate the size of the NSC and N pools. In both species, 13-37 % of the NSC and N pools were mobilized at the beginning of the growing season. Among the mobilized pools, stems and non-absorptive roots (branch orders 4-9) acted as the largest NSC sources in larch and ash, respectively, while branches served as the largest N source in both species. After stem girdling, 22 and 50 % of the root NSC stores in larch and ash, respectively, were mobilized to maintain root activities during the growing season. Tree mortality was observed 1 year after girdling, at which time there was still an abundant NSC pool in the roots. We conclude that (1) different storage organs differ in their contribution to new tissue growth at the beginning of the growing season and that those storage organs holding higher fractions of the NSC or N pool are not necessarily those which mobilize more NSC or N; (2) tree growth may not be limited by carbon (C) availability; (3) C storage in non-absorptive roots plays an important role in maintaining tree survival after the termination of photosynthate flow from aboveground sources. |
| 出处 | Oecologia |
| 卷 | 177 |
| 期 | 2 |
| 页 | 333-344 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0029-8549 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/38783]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Mei L.,Xiong, Y. M.,Gu, J. C.,et al. Whole-tree dynamics of non-structural carbohydrate and nitrogen pools across different seasons and in response to girdling in two temperate trees. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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