西鄂尔多斯地区强旱生小灌木水分参数的研究(Ⅰ)  

Water Parameters of Xeric Shrubs in West Erdos Region (Ⅰ)

作　　者：李骁[1] 王迎春[1] 征荣[1] 

机构地区：[1]内蒙古大学生命科学学院,内蒙古呼和浩特010021

出　　处：《中国沙漠》2005年第4期581-586,共6页Journal of Desert Research

基　　金：国家自然科学基金项目(30060006);内蒙古自然科学基金项目(200208020508)共同资助

摘　　要：绵刺、红砂、四合木、霸王柴为东阿拉善—西鄂尔多斯地区的超旱生灌木。本文运用PV技术对绵刺、红砂、四合木、霸王柴的多种水分关系参数(ψ100π、ψ0、F0、RWC0等)进行了测定,并通过测得的各水分参数从水分生理角度对这四种超旱生小灌木的耐旱性进行了比较分析。研究表明:①绵刺、红砂、四合木、霸王柴具有不同的耐旱机理,红砂主要体现为增加细胞溶质浓度的渗透调节,而四合木表现为较小的细胞体积(低的F0值)和较强的持水能力(较大的AWC值和Va/V0值)。②红砂具有非常低的ψ100π值(-3.1302MPa)与ψ0值(-3.5074MPa),体现出其具有很强的保持最大膨压和维持低水势的能力。③四合木的F0值(52.12%)很低,而AWC值(87.43%)和Va/V0值(7.8092)却很高,说明四合木具有较强的忍耐水分胁迫能力和抗脱水能力。④绵刺的根茎系统具有快速吸收和传导水分的能力,可能与其具有劈裂式生长的特征有关。⑤经过对数据的统计学检验分析,证明PV技术具有良好的重复性。Potaninia mongolica, Reaumuria soongorica, Tetraena mongolica and Zygophyllum xanthoxylon are the super xerophytes in the region from East Alxa to West Erdos. This article makes a measurement of several water parameters of them(ψ^(100)\-π,ψ_(0),F_(0),RWC^(0 ) etc.) by PV technique, and makes a comparison and analysis of drought tolerance in hydro-physiology. Following results have been obtained.(1) Potaninia mongolica, Reaumuria soongorica, Tetraena mongolica and Zygophyllum xanthoxylon have different mechanism of drought tolerance. Reaumuria soongorica could adjust osmosis by improving the concentration of cellular solute, but Tetraena mongolica has small cellular volume (low F_(0)) and strong ability of holding water (high AWC and V\-a/V_(0)).(2) The very low values of ψ^(100)\-π((-3.1302) MPa) and ψ_(0) ((-3.5074) MPa) in Reaumuria soongorica show that it has strong ability of maintaining large turgor and low water potential.(3) Tetraena mongolica has low F_(0 )(52.12%), high AWC(87.43%) and high V\-a/V_(0)(7.8092), which shows that Tetraena mongolica has strong ability of tolerating water deficiency and resisting dehydration.(4) The systems of roots and stems in Potaninia mongolica have the ability of absorbing and transmitting water.(5) Statistical test analysis proved that Pressure-Volume technique has good repetition characters.

关 键 词：鄂尔多斯地区 水分参数 小灌木 PV技术 四合木 旱生灌木 水分关系 比较分析 水分生理 渗透调节 溶质浓度 持水能力 细胞体积 脱水能力 水分胁迫 检验分析 红砂 绵刺 阿拉善 霸王 耐旱性 统计学 重复性 Va C值 

分 类 号：P534.4[天文地球—古生物学与地层学] Q945.17[天文地球—地质学]