【摘要】 本文通过ＰＶ技术对暖温带落叶阔叶林主要树种辽东栎（Ｑｕｅｒｃｕｓｌｉａｏｔｕｎｇｅｎｓｉｓ）、棘皮桦（Ｂｅｔｕｌａｄａｈｕｒｉｃａ）、五角枫（Ａｃｅｒｍｏｎｏ）、大叶白蜡（Ｆｒａｘｉｎｕｓｒｈｙｃｈｏｐｈｙｌａ）及其林下灌木六道木（Ａｂｅｌｉａｂｉｆｌｏｒａ）、山地针叶林的主要树种油松（Ｐｉｎｕｓｔａｂｕｌａｅｆｏｒｍｉｓ）以及次生灌丛主要树种山杏（Ｐｒｕｎｕｓａｒｍｅｎｉａｃａｖａｒ．ａｎ－ｓｕ）、山桃（Ｐｒｕｎｕｓｄａｖｉｄｉａｎａ）、大果榆（Ｕｌｍｕｓｍａｃｒｏｃａｒｐａ）、北京丁香（Ｓｙｒｉｎｇａｐｅｋｉｎｅｎｓｉｓ）的日最低叶水势Ψｍｉｎ、饱和含水量时的最大渗透势Ψｓａｔｓ、初始质壁分离时渗透势Ψｔｌｐｓ、初始质壁分离的渗透水的相对含量（ＲＯＷＣｔｌｐ）、相对含水量（ＲＷＣｔｌｐ）、质外体水的相对含量（ＡＷＣ）６种水分生理指标的季节变化进行了研究。结果表明：１）所研究的１０种树种叶水势Ψｍｉｎｗ的季节进程基本与土壤湿度的变化一致。乔木Ψｍｉｎｗ季节均值由低到高的顺序为油松＜辽东栎＜大叶白蜡＜棘皮桦＜五角枫。次生灌丛４种树种Ψｍｉｎｗ季节均值由低到高依次为：山杏＜山桃＜北京丁香＜大果榆。在生长季的不?更多还原

【Abstract】 In this paper,a pressurebomb technique was applied to measure the six physiological indices of ten main plant species in the forest ecosystem of warm temperate zone during the period from April to October of 1994.They were minimum water status of leaf (Ψmin),maximum osmotic potential at saturation point (Ψsats),osmotic potential at incipient plasmolysis (Ψtlps),relative water content at incipient plasmolysis(RWC),relative osmotic water content at incipient plasmolysis(ROWC),relative content of apoplectic water(AWC).The plant species under study were Quercus liaotungensis,Betula dahurica,Acer mono,Fraxinus rhychophylla,Abelia biflora,Pinus tabulaeformis,Prunus armeniaca var ansu,Prunus davidiana,Ulmus macrocarpa,Syringa pekinensis.The results were as follows:1)The seasonal change of Ψmin showed the tendency similar to that of soil moisture in all the above tree species.2)Ψsats and Ψtlps of the species continuously decreased in the course of the growth season,and were related to the phenological rhythm of the species.3)The seasonal variations in ROWCtlp and RWCtlp,generally,tended to be similar for the different species in the whole growing season.In the end of May those two indices reached the maximum and then declined accompanying the maturity of leaves and twigs.4)AWC of the species increased in growing season.更多还原