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学科主题: 地理学::自然地理学
题名: Temperature thresholds for the onset of xylogenesis in alpine shrubs on the Tibetan Plateau
作者: Li, XX (Li, Xiaoxia)1, 2; Rossi, S (Rossi, Sergio)3, 4; Liang, EY (Liang, Eryuan)1, 5; Camarero, JJ (Julio Camarero, J.)6
通讯作者: Liang, EY
关键词: CAMBIAL ACTIVITY ; CLIMATIC SIGNALS ; GROWING-SEASON ; SCOTS PINE ; SMITH FIR ; GROWTH ; TREE ; CONIFERS ; MOUNTAINS ; PERSPECTIVE
刊名: TREES-STRUCTURE AND FUNCTION
发表日期: 2016
DOI: 10.1007/s00468-016-1436-z
卷: 30, 期:6, 页:2091-2099
收录类别: SCI
合作性质: 国际
文章类型: Article
英文摘要: 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.
语种: 英语
WOS记录号: WOS:000387723300017
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7489
Appears in Collections:图书馆_期刊论文

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作者单位: 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:
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.
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