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题名: Flowering phenology of tree rhododendron along an elevation gradient in two sites in the Eastern Himalayas
作者: Ranjitkar, Sailesh1, 2; Luedeling, Eike3; Shrestha, Krishna Kumar4; Guan, Kaiyun5; null(许建初)1, 6
刊名: INTERNATIONAL JOURNAL OF BIOMETEOROLOGY
关键词: Rhododendron arboreum ; Initial flowering ; Partial least squares (PLS) ; Winter warming ; Soil moisture ; Early flowering
英文摘要: Flowering phenology of tree rhododendron (Rhododendron arboreum Sm.) was monitored in situ along elevation gradients in two distinct ecological settings. Observations were carried out in Gaoligong Nature Reserve (GNR) in China and in the Kanchenjunga Conservation Area (KCA) in Nepal. Using the crown density method, flowering events of the selected species were recorded. Flowering duration and synchrony were determined within each site and along the elevation gradient in each study area. Our observations showed high synchrony throughout the elevation gradient, especially for peak flowering. Mean 15-day soil temperature, soil parameters (soil moisture, nitrogen, organic matter and pH), age of the observed trees, and site characteristics (litter cover, canopy cover, inclination) were related to mean initial and peak flowering dates using partial least squares regression (PLS). Results differed between the two sites, but winter temperature was the most important variable affecting the regression model for both initial flowering and peak flowering at both sites. After temperature, soil moisture was the most important variable for explaining initial flowering dates. The distribution of tree rhododendron indicates that it is able to grow in a wide range of habitats with different environmental conditions. The recent trend of rising winter-spring temperature and the detected bloom-advancing effect of high temperatures during this period suggest that tree rhododendron might expand its distributional range in response to global warming.
出版日期: 2013-03-01
卷号: 57, 期号:2, 页码:225-240
语种: 英语
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内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/15901
Appears in Collections:资源植物与生物技术所级重点实验室_期刊论文

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作者单位: 1.Kunming Inst Bot, Ctr Mt Ecosyst Studies, Kunming 650204, Peoples R China
2.Chinese Acad Sci, Grad Sch, Kunming, Peoples R China
3.World Agroforestry Ctr, Nairobi 00100, Kenya
4.Tribhuvan Univ, Cent Dept Bot, Kathmandu, Nepal
5.Kunming Inst Bot, Key Lab Econ Plants & Biotechnol, Kunming 650204, Peoples R China
6.World Agroforestry Ctr, Kunming 650204, Peoples R China

Recommended Citation:
Sailesh Ranjitkar.Flowering phenology of tree rhododendron along an elevation gradient in two sites in the Eastern Himalayas.ational Journal of Biometeorology,2012(2)
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