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西鄂尔多斯地区强旱生小灌木的水分参数 被引量:15

Water parameters of desert xeric shrubs in west Erdos region.
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摘要 应用PV技术研究了西鄂尔多斯地区绵刺、红沙、四合木和霸王柴4种超旱生灌木的水分关系参数膨压(ψP)、细胞弹性模量(ε)、细胞体积比(RCV)及其相互关系.结果表明:在4种荒漠旱生灌木中,红沙保持最大膨压的能力最强(a=2.4593).不同荒漠旱生灌木保持膨压的方式不同:绵刺通过弹性调节保持膨压(εmax=8.4005 MPa);红沙通过渗透调节来保持膨压(ψπ100=-3.1302 MPa;ψ0=-3.5074 MPa);四合木通过渗透调节和弹性调节的协同作用来维持膨压;霸王柴通过渗透调节来保持膨压,而弹性调节能力较弱.绵刺具有柔软而高弹性的细胞壁,是构成其根茎系统快速吸收和传导水分能力的因素之一.四合木具有较柔软而高弹性的细胞壁且ψP的变化随RCV减小而趋于缓慢,说明四合木具有较强的持水能力和抗脱水能力. By using PV technique, this paper studied the turgor pressure (ψP), cell elastic modulus (ε), and relative cell volume (RCV) of super xerophytes Potaninia mongolica, Reaumuria soongorica, Tetraena mongolica and Zygophyllum xanthoxylon in west Alashan, with the relationships among the parameters analyzed. The results showed that R. soongorica had the strongest ability to maintain maximum turgor pressure ( α = 2. 4593 ). The four plants maintained their turgor pressure by different ways, i. e. , P. mongolica maintained it by elastic adjustment ( εmax : 8. 4005 MPa), R. soongorica by osmotic adjustment (ψπ100= -3. 1302 MPa; ψ0 = -3. 5074 MPa), T. mongolica by both osmotic and elastic adjustment, and Z. xanthoxylon by osmotic adjustment, which had weak adjustment ability. The cell wall of P. mongolica was soft and highly elastic, benefiting to the water absorption by root and stem and to the fast water transmission. T. mongolica also had relatively soft and high elastic cell wall, and its ψP and ε changed slowly with decreasing RCV, suggesting that this plant had strong ability of holding water and resisting dehydration.
出处 《应用生态学报》 CAS CSCD 北大核心 2007年第5期963-967,共5页 Chinese Journal of Applied Ecology
基金 国家自然科学基金资助项目(30060006 30460033).
关键词 强旱生小灌木 渗透调节 弹性调节 耐旱性 desert xeric shrub osmotic adjustment elastic adjustment drought tolerance.
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