干旱区生态环境知识资源中心(Arid): Squandering water in drylands: the water-use strategy of the phreatophyte Ziziphus lotus in a groundwater-dependent ecosystem

Arid

DOI	10.1002/ajb2.1606
	Squandering water in drylands: the water-use strategy of the phreatophyte Ziziphus lotus in a groundwater-dependent ecosystem
	Torres-Garcia, M. Trinidad; Salinas-Bonillo, Maria J.; Gazquez-Sanchez, Fernando; Fernandez-Cortes, Angel; Querejeta, Jose I.; Cabello, Javier
通讯作者	Torres-Garcia, MT (corresponding author), Univ Almeria, Dept Biol & Geol, Carretera Sacramento Sn, Almeria 04120, Spain. ; Torres-Garcia, MT (corresponding author), Univ Almeria, Andalusian Ctr Monitoring & Assessment Global Cha, Almeria, Spain.
来源期刊	AMERICAN JOURNAL OF BOTANY
ISSN	0002-9122
EISSN	1537-2197
出版年	2021
卷号	108 期号:2 页码:236-248
英文摘要	Premise Water is the most limiting factor in dryland ecosystems, and plants are adapted to cope with this constraint. Particularly vulnerable are phreatophytic plants from groundwater-dependent ecosystems (GDEs) in regions that have to face water regime alterations due to the impacts of climate and land-use changes. Methods We investigated two aspects related to the water-use strategy of a keystone species that dominates one of the few terrestrial GDEs in European drylands (Ziziphus lotus): where it obtains water and how it regulates its use. We (1) evaluated plants' water sources and use patterns using a multiple-isotope approach (delta H-2, delta O-18, and Delta C-13); (2) assessed the regulation of plant water potential by characterizing the species on an isohydric-anisohydric continuum; and (3) evaluated plants' response to increasing water stress along a depth-to-groundwater (DTGW) gradient by measuring foliar gas exchange and nutrient concentrations. Results Ziziphus lotus behaves as a facultative or partial phreatophyte with extreme anisohydric stomatal regulation. However, as DTGW increased, Z. lotus (1) reduced the use of groundwater, (2) reduced total water uptake, and (3) limited transpiration water loss while increasing water-use efficiency. We also found a physiological threshold at 14 m depth to groundwater, which could indicate maximum rooting length beyond which optimal plant function could not be sustained. Conclusions Species such as Z. lotus survive by squandering water in drylands because of a substantial groundwater uptake. However, the identification of DTGW thresholds indicates that drawdowns in groundwater level would jeopardize the functioning of the GDE.
英文关键词	anisohydry arid regions deep‐ rooted shrub foliar nutrient concentration gas‐ exchange rates Rhamnaceae stable isotopes water potential water‐ use efficiency WUE
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000617794100001
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349431
作者单位	[Torres-Garcia, M. Trinidad; Salinas-Bonillo, Maria J.; Gazquez-Sanchez, Fernando; Fernandez-Cortes, Angel; Cabello, Javier] Univ Almeria, Dept Biol & Geol, Carretera Sacramento Sn, Almeria 04120, Spain; [Torres-Garcia, M. Trinidad; Salinas-Bonillo, Maria J.; Gazquez-Sanchez, Fernando; Fernandez-Cortes, Angel; Cabello, Javier] Univ Almeria, Andalusian Ctr Monitoring & Assessment Global Cha, Almeria, Spain; [Querejeta, Jose I.] Consejo Super Invest Cient CEBAS CSIC, Ctr Edafol & Biol Aplicada Segura, Murcia, Spain
推荐引用方式 GB/T 7714	Torres-Garcia, M. Trinidad,Salinas-Bonillo, Maria J.,Gazquez-Sanchez, Fernando,et al. Squandering water in drylands: the water-use strategy of the phreatophyte Ziziphus lotus in a groundwater-dependent ecosystem[J],2021,108(2):236-248.
APA	Torres-Garcia, M. Trinidad,Salinas-Bonillo, Maria J.,Gazquez-Sanchez, Fernando,Fernandez-Cortes, Angel,Querejeta, Jose I.,&Cabello, Javier.(2021).Squandering water in drylands: the water-use strategy of the phreatophyte Ziziphus lotus in a groundwater-dependent ecosystem.AMERICAN JOURNAL OF BOTANY,108(2),236-248.
MLA	Torres-Garcia, M. Trinidad,et al."Squandering water in drylands: the water-use strategy of the phreatophyte Ziziphus lotus in a groundwater-dependent ecosystem".AMERICAN JOURNAL OF BOTANY 108.2(2021):236-248.