干旱区生态环境知识资源中心(Arid): Impact of groundwater depth on hydraulic performance and growth of Haloxylon ammodendron in a desert region of central Asia

Arid

DOI	10.1002/eco.2394
	Impact of groundwater depth on hydraulic performance and growth of Haloxylon ammodendron in a desert region of central Asia
	Xu, Gui-Qing; Mi, Xiao-Jun; Ma, Jian; Ma, Jie; Tang, Li-Song
通讯作者	Tang, LS (corresponding author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
来源期刊	ECOHYDROLOGY
ISSN	1936-0584
EISSN	1936-0592
出版年	2021-12
英文摘要	Anthropogenic withdraw of groundwater and climatic drought limits the water availability for phreatophytic vegetation in arid regions. In this study, a small xeric, phreatophytic tree Haloxylon ammodendron (C.A. Mey.) was investigated to understand the influence of depth to groundwater (DGW) on hydraulic traits and on the trade-off between drought tolerance and leaf area increment. A suite of traits including leaf water potential, pressure-volume (P-V) curves, Huber value, assimilation branch growth and osmotic regulation substance was measured across five sites with DGW ranges from 3.45 to 15.91 m. Our results indicate that H. ammodendron was subject to greater water stress with increasing DGW, as indicated by decreased predawn (psi(pd)) and midday (psi(md)) branch water potential. We also found that growth rate declined as Huber value increased with increasing DGW in the early growing season (EGS). Solute sugar, as a major osmotic substance, drives decreases in osmotic potential at full turgor and thus constrains assimilation branch growth with increasing DGW in EGS. Therefore, osmotic adjustment accompanied with water potential regulation (psi(pd)-psi(md)) and plasticity of Huber value allows this phreatophyte to absorb water from deeper soil layers and tolerate drought. However, these adaptive adjustments cannot fully compensate for nonoptimal water conditions as growth rate continued to decrease as DGW increased in EGS and even became negative in the late growing season (LGS) at almost all sites. Greater depth of groundwater had a significant effect on H. ammodendron and may have similar effects for other non-riparian phreatophytic plants in arid regions.
英文关键词	depth to groundwater groundwater-dependent ecosystem growth hydraulic architecture osmotic adjustment
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000734100100001
WOS关键词	TURGOR LOSS POINT ; LEAF WATER RELATIONS ; DROUGHT TOLERANCE ; POPULUS-EUPHRATICA ; TAMARIX-RAMOSISSIMA ; OSMOTIC ADJUSTMENT ; TO-GROUNDWATER ; VULNERABILITY ; RESPONSES ; PLANTS
WOS类目	Ecology ; Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/374731
作者单位	[Xu, Gui-Qing; Mi, Xiao-Jun; Ma, Jian; Ma, Jie; Tang, Li-Song] Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi, Peoples R China; [Xu, Gui-Qing; Mi, Xiao-Jun; Ma, Jian; Ma, Jie; Tang, Li-Song] Chinese Acad Sci, Fukang Stn Desert Ecol, Fukang, Peoples R China; [Xu, Gui-Qing; Mi, Xiao-Jun; Ma, Jian; Tang, Li-Song] Univ Chinese Acad Sci, Xinjiang Inst Ecol & Geograph, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Xu, Gui-Qing,Mi, Xiao-Jun,Ma, Jian,et al. Impact of groundwater depth on hydraulic performance and growth of Haloxylon ammodendron in a desert region of central Asia[J],2021.
APA	Xu, Gui-Qing,Mi, Xiao-Jun,Ma, Jian,Ma, Jie,&Tang, Li-Song.(2021).Impact of groundwater depth on hydraulic performance and growth of Haloxylon ammodendron in a desert region of central Asia.ECOHYDROLOGY.
MLA	Xu, Gui-Qing,et al."Impact of groundwater depth on hydraulic performance and growth of Haloxylon ammodendron in a desert region of central Asia".ECOHYDROLOGY (2021).