| Temperature thresholds for the onset of xylogenesis in alpine shrubs on the Tibetan Plateau | |
| Li, XX (Li, Xiaoxia)1,2; Rossi, S (Rossi, Sergio)3,4; Liang, EY (Liang, Eryuan)1,5; Camarero, JJ (Julio Camarero, J.)6; Liang, EY | |
| Source Publication | TREES-STRUCTURE AND FUNCTION
 |
| 2016 | |
| Volume | 30Issue:6Pages:2091-2099 |
| DOI | 10.1007/s00468-016-1436-z |
| Abstract | The threshold minimum air temperature driving xylem growth of alpine Rhododendron aganniphum is lower than that commonly observed at the treeline of conifers. Understanding how alpine shrubs grow and which environmental factors drive their biomass gain could help to functionally differentiate trees and shrubs. The cambium is the main meristem responsible for wood formation in trees and shrubs. Thus, a better knowledge of cambium growth dynamics in alpine shrubs would allow explaining why shrubs displace trees above the treeline. Here, we aim to investigate the timings and dynamics of xylogenesis and to identify the thermal thresholds controlling the onset of xylem growth of Rhododendron aganniphum, a tall shrub growing above the alpine treeline on the Tibetan Plateau. Timings of xylogenesis and radial growth rates were assessed from anatomical observations of the developing xylem during three growing seasons (2011, 2012, and 2013). The threshold temperature at which xylogenesis had a 0.5 probability of being active was calculated with logistic regressions. The onset of xylogenesis was observed between mid and late June, whereas the end of xylogenesis lasted from mid to late September. Overall, the duration of xylem growth lasted 88-101 days, and 94 % of the ring was formed from June to August. The threshold for the onset of xylem growth was observed at 2.0 +/- 0.6 A degrees C for the minimum air temperature, lower than that commonly observed for treeline conifers (ca. 6 A degrees C). This low thermal threshold allows alpine shrubs to have a growing season long enough to complete xylem production and maturation during the warmest summer months. Our results suggest that the time required to complete xylogenesis is critical to understand why shrubs displace trees above the treeline. |
| Subject Area | 自然地理学 |
| WOS ID | WOS:000387723300017 |
| Language | 英语 |
| Indexed By | SCI |
| Keyword | Cambial Activity Climatic Signals Growing-season Scots Pine Smith Fir Growth Tree Conifers Mountains Perspective |
| Cooperation Status | 国际 |
| Subtype | Article |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.itpcas.ac.cn/handle/131C11/7489 |
| Collection | 图书馆 |
| Corresponding Author | Liang, EY |
| Affiliation | 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Bldg 3,Courtyard 16,Lin Cui Rd, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Quebec Chicoutimi, Dept Sci Fondamentales, Chicoutimi, PQ, Canada 4.Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Ec, Prov Key Lab Appl Bot, South China Bot Garden, Guangzhou 510650, Guangdong, Peoples R China 5.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 6.Inst Pirena Ecol IPE CSIC, Ave Montanana 1005, Zaragoza 50080, Spain |
| Recommended Citation GB/T 7714 | Li, XX ,Rossi, S ,Liang, EY ,et al. Temperature thresholds for the onset of xylogenesis in alpine shrubs on the Tibetan Plateau[J]. TREES-STRUCTURE AND FUNCTION,2016,30(6):2091-2099. |
| APA | Li, XX ,Rossi, S ,Liang, EY ,Camarero, JJ ,&Liang, EY.(2016).Temperature thresholds for the onset of xylogenesis in alpine shrubs on the Tibetan Plateau.TREES-STRUCTURE AND FUNCTION,30(6),2091-2099. |
| MLA | Li, XX ,et al."Temperature thresholds for the onset of xylogenesis in alpine shrubs on the Tibetan Plateau".TREES-STRUCTURE AND FUNCTION 30.6(2016):2091-2099. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| V.30(6) 2091-2099 20（1444KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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