一种用SigmaPlot求PV曲线水分参数ψ_(tlp)的方法  

A method of calculating osmotic water potential (ψ_(tlp)) at turgor loss point in PV curve

作　　者：李洪建[1] 狄晓艳[1] 陈建文[1] 王孟本[2] 

机构地区：[1]中国科学院西双版纳热带植物园,昆明650223 [2]山西大学黄土高原研究所,太原030006

出　　处：《植物研究》2004年第1期71-75,共5页Bulletin of Botanical Research

基　　金：国家自然科学基金项目 ( 3 0 170 15 0 );山西省自然科学基金项目 ( 2 0 0 110 79)

摘　　要：以扶桑 (HibiscusRose sinensis)为例 ,用SigmaPlotforWindows软件分别绘制PV曲线双曲线和直线部分的散点图 ,同时拟合双曲线和直线方程。然后通过联立方程组求出质壁分离点的坐标值 ,计算出质壁分离时的渗透势 ( ψtlp)、相对水含量 (RWCtlp)和相对渗透水含量 (ROWCtlp)。并与常用的直线回归法的结果进行了比较。该方法具有简单、准确、快速等特点 。Taking Hibiscus Rose-sinensis as an example and using SigmaPlot (Demo) for windows software, the authors introduce a method of precisely calculating the osmotic potential at turgor loss point (ψ tlp) in PV curve, with which other water parameters, such as relative water content at turgor loss point (RWC tlp) and relative osmotic water content at turgor loss point (ROWC tlp), can be calculated exactly. Firstly, two scatter curves are plotted respectively with SigmaPlot Graph Wizard, then the two curves are fitted respectively with hyperbolic and linear patterns and regression coefficients are got. Finally, using the coefficients the authors calculate the ψ tlp, RWC tlp and ROWC tlp and make a comparison between the results and those of linear regression method. The method presented is simple and convenient to use.

关 键 词：PV曲线 水分参数 质壁分离点 双曲线方程 直线方程 方程拟合 抗旱生理指标 植物水分参数 

分 类 号：Q945.17[生物学—植物学]