CAJ | 학술논문

以黄土丘陵区植被演替过程中的7种典型乔灌木(乔木:山杨、油松、辽东栎;灌木:山桃、荆条、黄刺玫和狼牙刺)和人工种植种刺槐为研究对象,研究其叶水分利用效率(WUE)和水力学特性(比导水率K_s、比叶导水率K_1、Huber值HV、导水率损失50%所对应的木质部负压P_(50)、木材密度WD)的变化.结果表明:1)4种灌木的WUE明显高于4种乔木.4种乔木中,以刺槐的WUE为最高,演替早期种山杨的WUE高于演替后期种油松和辽东栎.2)4种乔木的平均K_s明显高于4种灌木,但HV明显低于4种灌木,其K_1与灌木相比差异不大.演替早期种山杨的K_s和Kl明显高于演替后期种油松和辽东栎,但木材密度则小于后两者.山杨的P_(50)高于油松而低于辽东栎和刺槐.人工种植种刺槐具有低K_s和K_1,且对木质部栓塞的抵抗能力弱.3)叶片的长期WUE和水力学特性之间并无显著的相关性,表明演替过程中水分利用效率的变化可能主要受水力学特性以外的其他生理过程的影响.
이황토구릉구식피연체과정중적7충전형교관목(교목:산양、유송、료동력;관목:산도、형조、황자매화랑아자)화인공충식충자괴위연구대상,연구기협수분이용효솔(WUE)화수역학특성(비도수솔K_s、비협도수솔K_1、Huber치HV、도수솔손실50%소대응적목질부부압P_(50)、목재밀도WD)적변화.결과표명:1)4충관목적WUE명현고우4충교목.4충교목중,이자괴적WUE위최고,연체조기충산양적WUE고우연체후기충유송화료동력.2)4충교목적평균K_s명현고우4충관목,단HV명현저우4충관목,기K_1여관목상비차이불대.연체조기충산양적K_s화Kl명현고우연체후기충유송화료동력,단목재밀도칙소우후량자.산양적P_(50)고우유송이저우료동력화자괴.인공충식충자괴구유저K_s화K_1,차대목질부전새적저항능력약.3)협편적장기WUE화수역학특성지간병무현저적상관성,표명연체과정중수분이용효솔적변화가능주요수수역학특성이외적기타생리과정적영향.
Plant physio-ecological characteristics at different stages of vegetation succession are a foundation to demonstrate the inner mechanism of vegetation succession and to rehabilitate the deteriorated ecosystem.Leaf long-term water use efficiency (WUE) and hydraulic characteristics (specific conductivity Ks,specific leaf conductivity K_1,Huber value HV,xylem pressure corresponding to 50% loss of conductivities P_(50) and wood density WD) of seven naturally generated dominant trees and shrubs (three trees:Populus davidiana,Pinus tabulaeformis,Quercus liaotungensis;four shrubs:Amygdalus davidiana,Vitex negundo var.heterophylla,Rosa xanthina,Sophora viciifolia) and a planted species Robinia pseudoacacia were determined in this study research.Results indicated that:1) Averaged leaf WUE of four shrubs was higher than that of four trees.Leaf WUE of planted Robinia pseudoacacia was the highest among the four trees,and leaf WUE in the early succession species Populus davidiana was higher than in the late succession species Pinus tabulaeformis and Quercus liaotungensis.2) Four trees species had a higher averaged K_s and a lower HV than four shrubs,thereby the averaged K_1 showed little difference.Populus davidiana had higher K_s,K_1 and a lower WD when compared with Pinus tabulaeformis and Quercus liaotungensis.The P_(50) of Populus davidiana was higher than that of Quercus liaotungensis but lower than Pinus tabulaeformis.Exotic Robinia pseudoacacia had a relatively lower Ks and K_1,and its xylem was more vulnerable to embolism than the other tree species.3) No correlation was found between leaf WUE and hydraulic characteristics,indicating the change of leaf WUE during vegetation succession was mainly caused by other physiological processes rather than the studied hydraulic properties.