Temporal variations of mobile carbohydrates in Abies fargesii at the upper tree limits
文献类型：期刊论文
| 作者 | Dang, H. S.; Zhang, K. R.; Zhang, Q. F.; Xu, Y. M. |
| 刊名 | PLANT BIOLOGY
 |
| 出版日期 | 2015 |
| 英文摘要 | Low temperatures are associated high-altitude treelines, but the functional mechanism of treeline formation remains controversial. The relative contributions of carbon limitation (source activity) and growth limitation (sink activity) require more tests across taxa and regions. We examined temporal variations of mobile carbon supply in different tissues of Abies fargesii across treeline ecotones on north- and south-facing slopes of the Qinling Mountains, China. Non-structural carbohydrate (NSC) concentrations in tissues along the altitudinal gradient on both slopes changed significantly in the early and late growing season, but not in the mid-growing season, indicating the season-dependent carbon supply status. Late in the growing season on both slopes, trees at the upper limits had the highest NSC concentrations and total soluble sugars and lowest starch concentrations compared to trees at the lower elevations. NSC concentrations tended to increase in needles and branches throughout the growing season with increasing elevation on both slopes, but declined in roots and stems. NSC concentrations across sampling dates also indicated increases in needles and branches, and decreases in roots and stem with increasing elevation. Overall altitudinal trends of NSC in A.fargesii revealed no depletion of mobile carbon reserves at upper elevation limits, suggesting limitation of sink activity dominates tree life across treeline ecotones in both north- and south-facing slopes. Carbon reserves in storage tissues (especially roots) in the late growing season might also play an important role in winter survival and early growth in spring at upper elevations on both slopes, which define the uppermost limit of A.fargesii. |
| 源URL | [http://202.127.146.157/handle/2RYDP1HH/333]  |
| 专题 | 中国科学院武汉植物园 |
| 推荐引用方式 GB/T 7714 | Dang, H. S.,Zhang, K. R.,Zhang, Q. F.,et al. Temporal variations of mobile carbohydrates in Abies fargesii at the upper tree limits[J]. PLANT BIOLOGY,2015. |
| APA | Dang, H. S.,Zhang, K. R.,Zhang, Q. F.,&Xu, Y. M..(2015).Temporal variations of mobile carbohydrates in Abies fargesii at the upper tree limits.PLANT BIOLOGY. |
| MLA | Dang, H. S.,et al."Temporal variations of mobile carbohydrates in Abies fargesii at the upper tree limits".PLANT BIOLOGY (2015). |
入库方式： OAI收割
来源：武汉植物园
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。