气候变化领域集成服务门户(CCPortal): Seasonal variation of leaf wax n-alkane delta H-2 values: Differences between Quercus aquifolioides (an evergreen tree) and Stipa bungeana (a perennial grass) from the southeastern Tibetan Plateau

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DOI	10.1016/j.gloplacha.2021.103674
	Seasonal variation of leaf wax n-alkane delta H-2 values: Differences between Quercus aquifolioides (an evergreen tree) and Stipa bungeana (a perennial grass) from the southeastern Tibetan Plateau
	Zhang, Xiaolong; Xu, Baiqing; Guenther, Franziska; Gleixner, Gerd
通讯作者	Zhang, XL ; Xu, BQ (通讯作者)
发表日期	2021
ISSN	0921-8181
EISSN	1872-6364
卷号	207
英文摘要	To understand the cause of known isotopic differences between grasses and trees, their seasonal variability and environmental drivers, we present a parallel study of a perennial grass, Stipa bungeana, and an evergreen tree, Quercus aquifolioides, in the monsoon-dominated southeastern Tibetan Plateau (TP), by conducting fortnightly paired delta H-2 analyses of precipitation (delta H-2(p)), leaf water, and n-alkanes (delta H-2(wax)) over a period of 2 y. Similar to previous investigations, we show that (delta H-2(wax) in both species are correlated to delta H-2(p) throughout two growing seasons. However, for the first time, we identified a time lag of 2 months in variation of delta H-2(wax) relative to delta H-2(p) in new Q. aquifolioides leaves, whereas nearly no lagged phenomena were observed in S. bungeana and old mature Q. aquifolioides leaves. The delta H-2(wax) in new Q. aquifolioides leaves correlated significantly with the total amount of n-alkanes. These findings suggest that the turnover rate of n-alkanes in new Q. aquifolioides leaves is possibly changing with their synthesis, and that is a possible mechanism of the observed delayed phenomenon. A paired ttest showed that the difference of delta(2)H(wax)between trees and grasses becomes insignificant after time-lag correction. Moreover, the apparent fractionation in Q. aquifolioides was significantly correlated with weekly or fortnightly precipitation amount, temperature, relative humidity, and wind velocity, while in S. bungeana only weekly or fortnightly precipitation amount. Our high temporal resolution observations hence confirm that climate variables are important drivers of plant delta H-2(wax) and, give significant implications for delta H-2(wax)-base paleoclimate reconstructions in global monsoonal regions.
关键词	HYDROGEN ISOTOPE FRACTIONATION WATER-USE EFFICIENCY STABLE-ISOTOPES D/H RATIOS PLANT PRECIPITATION CLIMATE RECORD BIOSYNTHESIS REGENERATION
英文关键词	Hydrogen isotope; N-alkane; Leaf wax; Paleoclimate; Paleohydrology
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000707090000002
来源期刊	GLOBAL AND PLANETARY CHANGE
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/260222
推荐引用方式 GB/T 7714	Zhang, Xiaolong,Xu, Baiqing,Guenther, Franziska,et al. Seasonal variation of leaf wax n-alkane delta H-2 values: Differences between Quercus aquifolioides (an evergreen tree) and Stipa bungeana (a perennial grass) from the southeastern Tibetan Plateau[J]. 中国科学院青藏高原研究所,2021,207.
APA	Zhang, Xiaolong,Xu, Baiqing,Guenther, Franziska,&Gleixner, Gerd.(2021).Seasonal variation of leaf wax n-alkane delta H-2 values: Differences between Quercus aquifolioides (an evergreen tree) and Stipa bungeana (a perennial grass) from the southeastern Tibetan Plateau.GLOBAL AND PLANETARY CHANGE,207.
MLA	Zhang, Xiaolong,et al."Seasonal variation of leaf wax n-alkane delta H-2 values: Differences between Quercus aquifolioides (an evergreen tree) and Stipa bungeana (a perennial grass) from the southeastern Tibetan Plateau".GLOBAL AND PLANETARY CHANGE 207(2021).