Water relations of trailing-edge evergreen oaks in the semi-arid upper Yangtze region, SE Himalaya

doi:10.1111/jse.12696

KIB OpenIR

	Water relations of trailing-edge evergreen oaks in the semi-arid upper Yangtze region, SE Himalaya
	He,Xiao-Fang ; Wang,Song-Wei ; Sun,Hang; Koerner,Christian ; Yang,Yang
	2021
发表期刊	JOURNAL OF SYSTEMATICS AND EVOLUTION
ISSN	1674-4918
卷号	59 期号:6 页码:1256-1265
摘要	Unlike the well-understood cold limit of trees, the causes of the dry trailing edge of trees await explanation. Here we aimed at explaining the drought limit of an evergreen oak species (Quercus pannosa s.l.) in a typical dry valley of the upper Yangtze region, SE Himalaya, where rains (ca. 250 mm/a) are largely confined to the typical monsoon season (July-August) with drought during the remaining 9-10 months. We capitalized on an unintentional year-round irrigation treatment with trees growing along the overflow of a water reservoir serving as moist controls. We measured shoot water potential (psi), leaf conductance (g), flushing phenology, leaf mass per area (LMA), foliar and stem delta C-13, leaf nutrients, and non-structural carbohydrates across the transition from non-monsoon to monsoon season, from April to August 2018. At the dry site, psi and g were high during the monsoon but declined to <-3 MPa as drought proceeded in the non-monsoon season. Irrigated oaks retained high values year-round. Oaks experiencing the natural drought flushed at the full strength onset of the monsoon only, that is, 80 days later than irrigated oaks. The annual shoot increment in oaks under natural drought was ca. 10% of that in irrigated oaks. However, mature foliage showed no difference in LMA and delta C-13 between dry and moist sites. We conclude that these oaks drastically reduce their activity in response to drought, with growth strictly confined to the monsoon season, the minimum duration of which, presumably is setting the range limit.
关键词	adaptation Himalaya monsoon climate Quercus species distribution water stress CARBON ISOTOPE DISCRIMINATION SOUTHERN RANGE-EDGE QUERCUS-ROBUR GROWTH DECLINE USE EFFICIENCY FOREST TREES RESPONSES DROUGHT PHOTOSYNTHESIS ILEX
DOI	10.1111/jse.12696
WOS记录号	WOS:000613425600001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/73288
专题	中国科学院昆明植物研究所
作者单位	1.[He, Xiao-Fang 2.Sun, Hang 3.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Kunming 650201, Yunnan, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.[Wang, Song-Wei 6.Univ Basel, Inst Bot, CH-4056 Basel, Switzerland
推荐引用方式 GB/T 7714	He,Xiao-Fang,Wang,Song-Wei,Sun,Hang,et al. Water relations of trailing-edge evergreen oaks in the semi-arid upper Yangtze region, SE Himalaya[J]. JOURNAL OF SYSTEMATICS AND EVOLUTION,2021,59(6):1256-1265.
APA	He,Xiao-Fang,Wang,Song-Wei,Sun,Hang,Koerner,Christian,&Yang,Yang.(2021).Water relations of trailing-edge evergreen oaks in the semi-arid upper Yangtze region, SE Himalaya.JOURNAL OF SYSTEMATICS AND EVOLUTION,59(6),1256-1265.
MLA	He,Xiao-Fang,et al."Water relations of trailing-edge evergreen oaks in the semi-arid upper Yangtze region, SE Himalaya".JOURNAL OF SYSTEMATICS AND EVOLUTION 59.6(2021):1256-1265.

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