黄栌在高陡岩质边坡覆绿中的环境适应特征

Environmental Adaptation Characteristics of Cotinus coggygria in High and Steep Rock Slopes Greening

以生态恢复工程中的覆绿植物黄栌(Cotinus coggygria)为研究对象,通过对岩壁所种植物的成活率、地上生长量以及根系形态结构的调查,探究高陡岩质边坡生态恢复物种的环境适应特征。结果表明:黄栌的成活率达到了100%,其树高、基径、冠幅的年均生长量分别为6.64,0.37,6.10 cm/a,虽然不同植物的生长指标增量明显不同,但黄栌各生长指标增长速度及地上生长量均最大;岩壁内黄栌平均根长、平均根茎比以及平均根密度分别为58 cm,0.66,2.7 cm/cm 3,根系形态的改变表征了黄栌对胁迫环境的抵御和适应能力。黄栌在高陡岩质边坡上良性生长,在器官水平上实现了对环境胁迫的感知并形成耐受性,说明其适应在胁迫环境下的生存,可为其他覆绿技术的物种选择提供参考。

In this work,the greening plant Cotinus coggygria as an example of the ecologically recovering species of high-steep rock slopes was selected as the research object for the project of engineering ecological restoration.Herein,we report the results of survival rate,above-ground growth and root morphology in the rock slopes to examine its environmental adaptability characteristics.Our results show that the survival rate of Cotinus coggygria reached 100%.The average annual growth of height,base diameter and crown diameter were 6.64,0.37 and 6.10 cm/a,respectively.Compared with that of other greening arbor plants in the same period,the aboveground growth of this plant in each period was the largest,indicating that it possessed strong stress resistance and adaptability capabilities under stressful environments on the high and steep rock slopes.The average root length,ratio of root to stem,and average root density of Cotinus coggygria in the rock walls were found to be 58 cm,0.66,2.7 cm/cm 3,respectively.The changes of root morphology were characteristic of the resistance and adaptability of the plant with stress environment.The benign growth of Cotinus coggygria on high-steep rock slopes and the perception of plant stress and tolerance at the organ level were main reasons of its strong adaption ability to survival under stressful conditions.With these results,we conclude that this greening plant can be widely planted as robust species in the landscape reconstruction technology.Our present study should also provide a useful reference to strong survivability in green coverings technology and species selection.