一种用SigmaPlot求PV曲线水分参数ψtlp的方法

植物研究 ›› 2004, Vol. 24 ›› Issue (1): 71-75.

一种用SigmaPlot求PV曲线水分参数ψ_tlp的方法

李洪建, 狄晓艳, 陈建文, 王孟本

山西大学黄土高原研究所, 太原 030006

收稿日期:2003-05-27 出版日期:2004-03-15 发布日期:2016-06-14
通讯作者: 王孟本, mbwang@sxu.edu.cn E-mail:mbwang@sxu.edu.cn
作者简介:李洪建(1958-), 男, 副教授, 主要从事植物生理生态及土壤水分生态研究。
基金资助:
国家自然科学基金项目(30170150);山西省自然科学基金项目(20011079)

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

LI Hong-Jian, DI Xiao-Yan, CHEN Jian-Wen, WANG Meng-Ben

Institute of Loess Plateau, Shanxi University, Taiyuan 030006

Received:2003-05-27 Online:2004-03-15 Published:2016-06-14

摘要/Abstract

摘要： 以扶桑(Hibiscus Rose-sinensis)为例, 用SigmaPlot for Windows 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(ψ_tlp)、相对水含量(RWC_tlp)和相对渗透水含量(ROWC_tlp)。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, 是获得PV 曲线主要参数的一种新方法。

关键词: i>, PV曲线, 质壁分离点, 双曲线方程, 直线方程, 方程拟合

Abstract: 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 osmoticwater 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.

Key words: PV curve, turgor loss point, hyperbolic equation, linear equation, equation fitting

李洪建, 狄晓艳, 陈建文, 王孟本. 一种用SigmaPlot求PV曲线水分参数ψ_tlp的方法[J]. 植物研究, 2004, 24(1): 71-75.

LI Hong-Jian, DI Xiao-Yan, CHEN Jian-Wen, WANG Meng-Ben. A method of calculating osmotic water potential (ψ_tlp) at turgor loss point in PV curve[J]. Bulletin of Botanical Research, 2004, 24(1): 71-75.