六个木本植物木质部栓塞脆弱性及其水容调节作用的研究  

THE RESEARCH OF VULNERABILITY OF XYLEM EMBOLISM AND ITS REGULATION EFFECT OF WATER CAPACITY OF TWIGS OF SIX WOODY PLANTS

作　　者：亓立云[1] 马履一[2] 张迎辉[1] 赵文飞[1] 王华田[1] 

机构地区：[1]山东农业大学林学系,山东泰安271018 [2]北京林业大学研究生院,北京100083

出　　处：《山东农业大学学报（自然科学版）》2005年第4期495-500,共6页Journal of Shandong Agricultural University：Natural Science Edition

基　　金：国家自然科学基金"30371147;2003";山东省博士后基金"华北地区主要造林树种耗水特性和耗水调控机制研究"的资助

摘　　要：生长季节对白蜡(Fraxinus chinensis)、旱柳(Salix matsudana)、山桃(Amygdalus davidiana)、山杏(Armeniacamandshurica)、大叶扶芳藤(Euonymus fortunei)、I-107杨(Populus tremula L.)6种木本植物,采用冲洗法和压力室法分别测定了一年生小枝的导水率、水势和水容,采用曲线回归方法拟合各树种栓塞脆弱性曲线和水势-水容关系曲线。结果表明:①树种之间一年生枝条木质部栓塞脆弱性差异明显,其中I-107杨、旱柳、山杏属于栓塞脆弱树种,大叶扶芳藤抗栓塞能力最强,山桃、白蜡栓塞脆弱性中等;②树种之间组织水容的调节作用也有很大差异,大叶扶芳藤的组织水容调节能力最大,其次为山杏、I-107杨、山桃,然后是旱柳、白蜡;③被测树种的栓塞脆弱性和水容拟合曲线均为倒数形式,拟合方程极为显著;④枝条木质部水容与导水性之间关系密切,对导水损失率进行倒数转换,并与水容进行相关分析,结果表明相关性极显著。Six woody plants of Fraxinus chinensis, Salix matsudana, Amygdalus davidiana, Armeniaca mandshurica, Euonymus fortunei and Populus tremula L. were used to measure the hydrology conductance, water potential and water capacity of one-year-old twigs by flushing and pressure chamber method in growing season. ＇Vulnerability curves＇ and＇ Water potential-water capacity curves＇ of each tree species were also plotted. The result showed that：①The vulnerability of xylem embolism of one- year-old twig differed from each other significantly. Among them P. tremula L, S. matsudana and A. mandshurica were the most vulnerable species. E. fortunei was the most invulnerable species to embolism and the other tree species, F. chinensis and A. davidiana, were between the above two kinds. ②There were distinct differences among species in the regulation of water capacity on xylem embolism. Euonymus fortunei had the most strong regulgtion ability, and Salix matsudana, Fraxinus chinensis had the weakest controlling ability, and the remaining tree species were in the middle. ③The embolism vulnerability curves and the water capacity curves of all the measured species were in reciprocal forms. They all had significantly fitting formulas. ④Analyzing water capacity and the reciprocal of water hydrology-conductance loss, high correlation coefficient was obtained by correlation analysis. And correlation between xylem embolism and water capacity was significant.

关 键 词：木质部栓塞脆弱性 导水率 水容 水势 

分 类 号：S718.43[农业科学—林学]