干旱区生态环境知识资源中心(Arid): 4种沙生灌木幼苗PV曲线水分参数对干旱胁迫的响应

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	4种沙生灌木幼苗PV曲线水分参数对干旱胁迫的响应
其他题名	The Response of Pressure-volume Curve Water Parameters of Four Desert Shurb Seedlings to Drought Stress
	韩刚 1; 李彦瑾 1; 孙德祥 2; 赵忠 1
ISSN	1000-4025
出版年	2008
卷号	28 期号:7 页码:1422-1428
中文摘要	以柠条、沙木蓼、杨柴和花棒4种沙生灌木幼苗为材料,采用盆栽法在适宜水分、中度干旱和重度干旱(田间持水量的75%、50%和35%)3种土壤水分条件下,应用PV技术测定了它们在膨压为0时的渗透势(psi_s~(tlp))、相对水含量(RWC~(tlp))和相对渗透水含量(ROWC~(tlp)),以及饱和含水时的渗透势(psi_s~(sat))、束缚水含量(Va)、膨压随叶水势下降而降低的速率b值和组织细胞总体弹性模量(epsilon′)等水分参数,并用隶属函数值法对4种苗木在干旱下保持膨压的能力进行了综合评价.结果显示:与适宜水分条件下相比较,除花棒幼苗在中度及重度干旱下psi_s~(sat)值、柠条苗在中度干旱下psi_s~(sat)和psi_s~(tlp)差值和在中度及重度干旱下Va值、沙木蓼苗在中度干旱下epsilon′和RWC~(tlp)值均变化很小以外,4种苗木其它水分参数在不同程度干旱胁迫下均有较明显的变化,且其变化幅度随干旱胁迫的加剧而增加,从而使苗木保持膨压及吸水保水的能力较适宜水分下明显增强;苗木保持膨压能力的综合评价结果为:中度干旱下柠条>花棒>杨柴>沙木蓼,重度干旱下柠条>花棒>沙木蓼>杨柴.研究表明,柠条幼苗对干旱胁迫具有极强的渗透调节适应性.
英文摘要	With pressure-volume technique the water parameters including osmotic potential at zero turgor point(psi_s~(tlp)),osmotic potential at water saturation point (psi_s~(sat)),relative water content and osmotic potential water content at zero turgor point(RWC~(tlp) and ROWC~(tlp)),rate of bound water(Va),ratio of descendent of turgor with the leaf water potential (b) and cell whole elastic modulus(epsilon’) of seedlings of Caragana korshinskii,Atraphaxis bracteata,Hedysarum mongolicum,Hedysarum scoparium were studied under three soil moisture treatments which were suitable soil moisture,mediun drought and severe drought(75%,50% and 35% of saturated soil moisture content)by planting seedlings in pots.The subordinate function value analysis was used to estimate the abilities of maintaining turgor of four species seedlings under drought.Except that the psi_s~(sat) values of Hedysarum scoparium seedlings under medium and severe drought,the differences between psi_s~(sat) and psi_s~(tlp) and Va values of Caragana korshinskii seedlings under medium drought and under medium and severe drought,the epsilon’ and RWC~(tlp) values of Atraphaxis bracteata seedlings under medium drought changed a little compared with suitable soil moisture.The other water parameters of four species seedlings under different drought stress conditions changed considerably and the changes increased along with drought stress becoming stronger.It indicated the abilities of maintaining turgor and capturing and keeping water of seedling were improved obviously compared with suitable soil moisture.The comprehensive estimating results on abilities of maintaining turgor showed that they were Caragana korshinskii>Hedysarum scoparium>Hedysarum mongolicum>Atraphaxis bracteata under medium drought and Caragana korshinskii>Hedysarum scoparium>Atraphaxis bracteata>Hedysarum mongolicum under severe drought.The conclusion was the Caragana korshinskii seedling possess very strong adaptability of osmotic adjustment to drought stress.
中文关键词	沙生灌木 ; PV曲线 ; 水分参数 ; 干旱胁迫
英文关键词	desert shurb pressure-volume curve water parameter drought stress
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MULTIDISCIPLINARY SCIENCES
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:3324903
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/222931
作者单位	1.西北农林科技大学林学院, 杨陵, 陕西 712100, 中国; 2.杨凌职业技术学院, 杨陵, 陕西 712100, 中国
推荐引用方式 GB/T 7714	韩刚,李彦瑾,孙德祥,等. 4种沙生灌木幼苗PV曲线水分参数对干旱胁迫的响应[J]. 西北农林科技大学,2008,28(7):1422-1428.
APA	韩刚,李彦瑾,孙德祥,&赵忠.(2008).4种沙生灌木幼苗PV曲线水分参数对干旱胁迫的响应.,28(7),1422-1428.
MLA	韩刚,et al."4种沙生灌木幼苗PV曲线水分参数对干旱胁迫的响应".28.7(2008):1422-1428.