干旱区生态环境知识资源中心(Arid): Variation in delta N-15 of fog-dependent Tillandsia ecosystems reflect water availability across climate gradients in the hyperarid Atacama Desert

Arid

DOI	10.1016/j.gloplacha.2019.103029
	Variation in delta N-15 of fog-dependent Tillandsia ecosystems reflect water availability across climate gradients in the hyperarid Atacama Desert
	Jaeschke, Andrea 1; Boehm, Christoph 2; Merklinger, Felix F.3; Bernasconi, Stefano M.4; Reyers, Mark 2; Kusch, Stephanie 1; Rethemeyer, Janet 1
通讯作者	Jaeschke, Andrea
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2019
卷号	183
英文摘要	The Atacama Desert is considered one of the driest places on Earth, where the availability of water plays a crucial role in determining the presence of plants. The sparse vegetation is limited to the coastal mountains, where abundant fog provides the main source of water and nutrients for unique Tillandsia landbeckii ecosystems. The apparent retreat of this fog-dependent vegetation over the past decades, however, may relate to changing climatic conditions, in particular increasing aridity. In this study, we used the nitrogen isotopic composition (delta N-15) of plant organic matter as a measure of water availability and atmospheric nitrogen input in present and past Tillandsia dune fields. We compiled an extensive data set on delta N-15 values of living plants and corresponding site factors (latitude, elevation, cloud cover and precipitation) along a coastal transect We present radiocarbon-based ages of relict T. landbeckii layers preserved in sand dunes that evolved episodically over the past 2500 years. Site-averaged delta N-15 values range from +2 parts per thousand to -16 parts per thousand, with variations of up to 4 parts per thousand observed within one site that can be related to changes in elevation. The spread in delta N-15 values is surprising and considerably larger than previously reported for T. landbeckii. In contrast, delta N-15 values of Huldobria fruticosa and Ophryosporus spp. leaves collected mostly below and above the fog zone vary between +4 parts per thousand and + 17 parts per thousand, largely in agreement with global observations from water-limited systems. Comparison with satellite-based meteorological data and modelling results revealed significant correlations between delta N-15 values of T. landbeckii and total cloud cover (r = - 0.90; p < .01), cloud height (r = -0.93; p < .001) and precipitation (r = -0.98; p < .001) along the investigated transect. The gradient in delta N-15 values further coincides with surface ocean nutrient concentrations in austral summer when ocean primary production is highest suggesting a potential marine source for the large spread in delta N-15 values. Reconstruction of past changes in fog water supply based on fossil T. landbeckii remains indicate a distinct dry episode that is consistent with a known period of extreme long-lasting droughts during late Medieval times.
英文关键词	Atacama Desert Hyperaridity Tillandsia landbeckii Stratocumulus cloud Fog Nitrogen isotopes WRF model
类型	Article
语种	英语
国家	Germany ; Switzerland
收录类别	SCI-E
WOS记录号	WOS:000497250400007
WOS关键词	ISOTOPIC COMPOSITION ; NATURAL-ABUNDANCE ; GLOBAL PATTERNS ; NITROGEN ; PLANTS ; CHILE ; AGE ; PRECIPITATION ; BROMELIACEAE ; VARIABILITY
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
EI主题词	2019-12-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311348
作者单位	1.Univ Cologne, Inst Geol & Mineral, Cologne, Germany; 2.Univ Cologne, Inst Geophys & Meteorol, Cologne, Germany; 3.Univ Bonn, Nees Inst Biodivers Plants, Bonn, Germany; 4.Swiss Fed Inst Technol, Inst Geol, Zurich, Switzerland
推荐引用方式 GB/T 7714	Jaeschke, Andrea,Boehm, Christoph,Merklinger, Felix F.,et al. Variation in delta N-15 of fog-dependent Tillandsia ecosystems reflect water availability across climate gradients in the hyperarid Atacama Desert[J],2019,183.
APA	Jaeschke, Andrea.,Boehm, Christoph.,Merklinger, Felix F..,Bernasconi, Stefano M..,Reyers, Mark.,...&Rethemeyer, Janet.(2019).Variation in delta N-15 of fog-dependent Tillandsia ecosystems reflect water availability across climate gradients in the hyperarid Atacama Desert.GLOBAL AND PLANETARY CHANGE,183.
MLA	Jaeschke, Andrea,et al."Variation in delta N-15 of fog-dependent Tillandsia ecosystems reflect water availability across climate gradients in the hyperarid Atacama Desert".GLOBAL AND PLANETARY CHANGE 183(2019).