气候变化领域集成服务门户(CCPortal): Reduced stomatal frequency with rising elevation for Kobresia royleana on the Tibetan Plateau

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DOI	10.1016/j.gecco.2020.e01326
	Reduced stomatal frequency with rising elevation for Kobresia royleana on the Tibetan Plateau
	Zhang, Lin; Zhang, Shuren; Li, Qijia; Quan, Cheng
通讯作者	Li, QJ (通讯作者)
发表日期	2020
EISSN	2351-9894
卷号	24
英文摘要	Knowledge about within-species variation in stomatal frequency with varying elevation at very high elevations is rare, which is crucial for us to understand how alpine plants are adapted to the extreme environment. Here, we focus on the variation in stomatal frequency in Kobresia royleana (Nees) Boeckeler (Cyperaceae, Cyperales) along two altitudinal transects (elevation ranges from 3723 m to 5081 m) in the center of the Tibetan Plateau. The result shows the stomatal density (SD) varied from 303 +/- 55.6 mm(-2) to 542 +/- 81.8 mm(-2), and stomatal index (SI) ranged from 21.0% to 29.6%. In contrast with most cases, an unexpected negative response of stomatal frequency to rising elevation was observed. Among abiotic factors, the growing season mean temperature and CO2 partial pressure significantly declined with increasing elevation, while the growing season precipitation did not vary. Therefore, the decreasing SD and SI were mainly due to the declining temperature rather than the decreasing CO2 partial pressure. Further, SD and SI were negatively related to leaf functional traits of specific leaf area (SLA), leaf nitrogen concentration (N) and stable carbon isotope ratios (delta C-13), and all these morphological and physiological traits tended to covary with rising elevation and declining temperature. Meanwhile, the increasing delta C-13, N and SLA with elevation seem to be strategies for alpine plants to cope with the low-temperature environments. Therefore, the observed covariance between stomatal frequency and leaf functional traits also suggests that the low temperature rather than low CO2 partial pressure mainly leads to the elevational pattern of stomatal frequency for this alpine species. (C) 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.
关键词	CARBON-ISOTOPE DISCRIMINATION WATER-USE EFFICIENCY UV-B RADIATION LEAF MORPHOLOGY ALTITUDINAL VARIATION CLIMATE-CHANGE FOSSIL LEAVES DENSITY CO2 TRAITS
英文关键词	C-3 sedge; Stomatal density; Low temperature; Specific leaf area; Leaf carbon discrimination
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology
WOS记录号	WOS:000608479300016
来源期刊	GLOBAL ECOLOGY AND CONSERVATION
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259764
推荐引用方式 GB/T 7714	Zhang, Lin,Zhang, Shuren,Li, Qijia,et al. Reduced stomatal frequency with rising elevation for Kobresia royleana on the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2020,24.
APA	Zhang, Lin,Zhang, Shuren,Li, Qijia,&Quan, Cheng.(2020).Reduced stomatal frequency with rising elevation for Kobresia royleana on the Tibetan Plateau.GLOBAL ECOLOGY AND CONSERVATION,24.
MLA	Zhang, Lin,et al."Reduced stomatal frequency with rising elevation for Kobresia royleana on the Tibetan Plateau".GLOBAL ECOLOGY AND CONSERVATION 24(2020).