| This article focused on three kinds of experimental vines(Hedera nepalensis var. sinensis,Lonicera japonica, Mucuna sempervirens) to contrast their waterlogging tolerance and landscape application by using the water flooding method, then to observe the changes of morphological characteristics and physiological biochemical indexes whether they are in the flooded treatment or half submerged treatment.Later to make a comprehensive evaluation on these three kinds of vines of waterlogging resistance strength with principal component and the membership function analysis.At last it discussed their application in landscaping combining with ornamental characteristics and climatic characteristics in Sichuan Basin. The main conclusions were as follows:1, With the extension of submergence time, these three species of vines appeared different degree of chlorosis of leaves and turned yellow, Mucuna sempervirens and Hedera nepalensis var. Sinensis occured death in flooding after 12days and 24days. All palnts of Mucuna died after 24 days. There was no death phenomenon occurred on Lonicer a japonica in the whole test process.According to the results of observation on morphological features, the injury degree of three vines was:Lonicer a japonica>Hedera nepalensis var. Sinensis> Mucuna sempervirens.2,These three kinds of vines’ blade relative water content and chlorophyll content were declining generally as the time prolonged in water no matter they are in flooded treatment or not. This trend reacts these three plants’ responses to flooding stress intuitively. All these phenomenons coincide with the results of chlorosis as well as wilt increased for time extension.3,During the process of flooding stress, Hedera nepalensis var. Sinensis and Lonicera japonica can maintain the balance of body protein content by promoting the anaerobic protein synthesis. Hedera nepalensis var. Sinensis changed a lot after 6days in flooding and descend 31.02%; most of the soluble protein content in Mucuna showed decline trend, it descends 13.83% after 18days in flooded treatment while desends 17.46% after 30days in half submerged treatment.It indicates that plants damaged a lot because of the disadvantageous environment caused by flooding. Of course, plants can’t grow or metabolize normally and rappear discomfort symptoms.4, Under the two treatments, The variation of soluble sugar of Mucuna sempervirens tended to increase, the plants on full submergence treatment were 88.54% rise after 18days, those on half submerged processing were increased up to the maximum after 18 days, rised by 79.33%;on both treatment to Hedera nepalensis var. Sinensis, the trend of the variation of soluble sugar content showed as:increasin-declining-increasing. The Honeysuckle on fully submerged treatment rose to its limit after 24 days, increased by 171.89%, the plants on half submerged treatmeng changed more volatility, after the 18 days,the content rose to maximum, by 100.96%.According to the The variation of soluble sugar, it is concluded that the three kinds of vines take the accumulation of soluble sugar content as an important metabolic adaptation to flooding stress. in the flood period, Lonicera japonica and Mucuna sempervirens showed a downward trend, and the late Ivy flooded keep rising, showwing that the glucose metabolism way of Ivy is stronger than Lonicera japonica and Mucuna sempervirens.5, All variations regulation of proline content dealed in different ways was: all submerge waterlogging disposal>semi-submerge waterlogging disposal>control. The ability to adapt to waterlogging stress of Mucuna is the worst in these experimental materials. After 18 days, tis plants on full submergence treatment were 52.50% decline, and those on half submerged treatment were decreased by 70%, the decline range reached its maximum,the result showed that Mucuna could not avoid injuring by water logging through accumulating the content of proline, which could be finished by Lonicera japonica and Hedera nepalensis var. Sinensis during a relatively short time under waterlogging stress.6,In the primary period of flooding stress, all these three vines’activity of SOD are increasing,which indicating that three kinds of plants can improve the activity of SOD to balance Oxygen in order to adjust a certain degree of water environment Lonicera japonica is weaker than other two vines in self adjustment ability.They begin to decrease the activity of SOD after twelve-day waterlogging treatment.7,The content of MDA showed a significant negative orrelation with these three species of vines in waterlogging tolerance. The plants injure more serious if the content of MDA accumulates more and quickly. The flooding of Mucuna sempervirens for 12days,the content accumulated to the highest,38.95%,then remained stable, it shows that it’s the earliest to be injured and this damage can sustain. Hedera nepalensis var. Sinensis and Lonicera japonica reach the highest point on the 18th day after they begin to decline, showing that the two kinds of plants have strong adaptability to flooding,their damages can be a certain degree of self repair.8, through the principal component analysis of these three seven physiological indexes, and abstract three principal components, then evaluate the comprehensive index of each principal component, and selected 5 indicators of the relative water content, chlorophyll content, PRO content, soluble sugar content and MDA content as three vines waterlogging tolerance evaluation index,later membership function was used to analysis on the 5 indicators, then combined with morphological observation to determine the different sequence for three kinds of vines:Lonicera japonica>Hedera nepalensis var. Sinensis> Mucuna sempervirens.9, According to the three kinds of vines of waterlogging resistance strength and combining with the climate characteristics of Sichuan Basin.We can draw a conclusion that the most resistance to waterlogging of Lonicera japonica can be properly applied to the low-lying, poor drainage areasHedera nepalensis var. Sinensis can’t grow in this environment which is full of water in long periods and the worst resistance to waterlogging of Mucuna sempervirens should try to aviod the water and the flooded areas. |
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