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北方主要造林树种耐旱机理及其分类模型的研究(Ⅰ)——苗木叶水势与土壤含水量的关系及分类
引用本文:李吉跃,张建国.北方主要造林树种耐旱机理及其分类模型的研究(Ⅰ)——苗木叶水势与土壤含水量的关系及分类[J].北京林业大学学报,1993(3).
作者姓名:李吉跃  张建国
作者单位:北京林业大学林业资源学院 (李吉跃),北京林业大学林业资源学院(张建国)
摘    要:本文详细研究了我国北方部分主要造林树种苗木叶水势与土壤含水量的关系,结果表明:①苗木叶水势Ψ_w与土壤含水量SWC呈明显的“反J型”关系,应用双曲线方程y=a+b/x和指数方程y=ae~(b/x)拟合效果最优.②不同树种Ψ_w随SWC下降的变化差异很大,从而表明不同树种对土壤干旱胁迫的反应和适应不尽相同.依据Levitt和Kramer以及李吉跃等人对植物适应干旱方式的分类方法,应用系统聚类法将21个树种分为两大类4个亚类,即高水势延迟脱水树种(包括油松、樟子松、长白松、白皮松,华山松),亚高水势延迟脱水树种(包括二白杨、火炬树、华北落叶松),亚低水势忍耐脱水树种(包括文冠果、杜仲、沙枣、栾树、花椒、白榆、新疆杨.毛条、胡杨、红柳、侧柏),低水势忍耐脱水树种(包括山杏和山桃).相应于每一类为其建立了Fuzzy模式识别模型.这一模型可以在更为广阔的范围内判别其它树种的耐旱机理及其类型.

关 键 词:叶水势  土壤含水量  耐旱机理  树种分类  系统聚类  Fuzzy模式识别

Studies on Classification Models and Mechanisms of Drought Tolerance of Chief Afforestation Species in the Northern Part of China (Ⅰ)——The Classification of Relationships Between Seedling Leaf Water Potential and Soil Water Content
Li Jiyue Zhang Jianguo.Studies on Classification Models and Mechanisms of Drought Tolerance of Chief Afforestation Species in the Northern Part of China (Ⅰ)——The Classification of Relationships Between Seedling Leaf Water Potential and Soil Water Content[J].Journal of Beijing Forestry University,1993(3).
Authors:Li Jiyue Zhang Jianguo
Abstract:The relationships between leaf water potential of seedlings and soil water content in some chief afforestation species in the northern part of China were studied in detail.The results show that,( 1 ) there is a clear anti-J relation between leaf water potential of seedlings (ψw) and soil water content (SWC).For the optimum effect this relationship corresponds to the hyperbolic equation (y=a+b/x) and exponential equation(y=aeb/x).(2) There are great differences in which ψw of various tree species varys with decrease of SWC.This shows clearly that the response and adaptation of various species to soil drought stress are different.According to the classification of ways in which plants adapt to drought stress (Levitt,Kramer and Li Jiyue et al.),4 types of drought tolerance of plants can be identified in 21 tree species examined applying a system cluster method.That is,(1) Drought tolerance by dehydration postponement at high tissue water potential.( 2 ) Drought tolerance by dehydration postponement at sub-high tissue water potential;( 3 ) Drought tolerance by dehydration tolerance at sub-low tissue water potential;and ( 4 ) Drought tolerance by dehydration tolerance at low tissue water ptential.In addition,the models of Fuzzy pattern recognition were established for every type of drought tolerance of plants.The mechanism and types of drought tolerance of other species can be recognized using these models over an extensive range.
Keywords:leaf water potential  soil water content  mechanism of drought tolerance  classification system  cluster method  Fuzzy pattern recognition
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