Xylem hydraulic conductivity and embolism in riparian plants and their responses to drought stress in desert of Northwest China
Xylem hydraulic conductivity and embolism in riparian plants and their responses to drought stress in desert of Northwest China
复制标题
西北荒漠河岸植物木质部导水率和栓塞及其对干旱胁迫的响应
DOI：
10.1002/eco.1412
复制
发表时间：
2013-12
期刊：
影响因子：
2.6
通讯作者：
Ayup, Mubarek
中科院分区：
文献类型：
--
作者：
Zhou, Honghua;Chen, Yaning;Li, Weihong;Ayup, Mubarek
以塔里木河下游（铁坎里克）和黑河下游（乌兰图格）的河岸植物为研究对象，研究不同干旱胁迫对河岸植物的影响。研究了典型河岸植物胡杨、柽柳、分析了骆驼刺和卡累利阿对干旱胁迫的响应。结果表明：（1）塔里木河下游河岸植物由于木质部导水率较低，遭受的干旱胁迫比黑河下游严重，地下水埋深是导致两个地区河岸植物遭受不同程度干旱胁迫的根本原因;（2）柽柳的抗旱性较强。疏叶相思和K.由于其抗旱性较弱，仅在地下水埋深小于4 m的狭窄生境中生存;轻度干旱胁迫下，河岸植物水分运输的主要阻力部位是枝条木质部，重度干旱胁迫下，河岸植物水分运输的主要阻力部位是根系木质部，河岸植物通过限制枝条木质部导水率来协调植物生长，而在严重干旱胁迫下，则通过提高具有较强液流竞争力的优势枝的木质部导水率，牺牲非优势枝来提高植株存活率.版权所有© 2013约翰威利父子有限公司.
Riparian plants in the lower reaches of the Tarim River (Tikanlik) and Heihe River (Ulan Tug) were selected as study objects, where they suffered from different drought stresses. The differences of root and twig xylem hydraulic conductivity and embolism of the typical riparian plants, including Populus euphratica, Tamarix spp., Alhagi sparsifolia and Karelinia caspica, and their responses to drought stress were analysed. The results showed that (1) the riparian plants in the lower Tarim River suffered from more severe drought stress than those in the lower Heihe River because of their lower xylem hydraulic conductivity, and the fundamental reason resulted in different degrees of drought stresses in the two regions was groundwater depth; (2) the drought resistance of Tamarix spp. was the strongest, which could exist in a broad habitat with different degrees of water stresses, whereas A.sparsifolia and K. caspica only exist in a narrow habitat with groundwater depth less than 4 m because of their weak drought resistance; and (3) the main resistance part of water transportation of riparian plants was twig xylem when they encountered the mild drought stress, whereas it was root xylem when the riparian plants encountered severe drought stress, and riparian plants adapted the mild drought stress through limiting twig xylem hydraulic conductivity to coordinate the plant growth, while they adapted the severe drought stress through enhancing xylem hydraulic conductivity of dominant branches with strong competitiveness of sap flow and sacrificing non‐dominant branches to improve the plant survival chance. Copyright © 2013 John Wiley & Sons, Ltd.
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影响因子：
1.1
作者：
M. Zimmermann
通讯作者：
M. Zimmermann
影响因子：
--
作者：
Fu Aihong
通讯作者：
Fu Aihong
DOI：
10.1007/s00468-007-0148-9
发表时间：
2007-06
期刊：
Trees
影响因子：
--
作者：
P. Trifilò;M. A. Lo Gullo;A. Nardini;F. Pernice;S. Salleo
通讯作者：
P. Trifilò;M. A. Lo Gullo;A. Nardini;F. Pernice;S. Salleo
DOI：
10.1007/978-3-662-22627-8
发表时间：
1983-06
期刊：
--
影响因子：
--
作者：
M. Zimmermann
通讯作者：
M. Zimmermann
DOI：
10.17521/cjpe.2004.0018
发表时间：
2004
期刊：
--
影响因子：
--
作者：
D. Fan;Zongqiang Xie
通讯作者：
D. Fan;Zongqiang Xie