Study On Drought Resistance Of Four Thorny Fence Plants

Thorny fence which is made with the branch or prickle plants to build a special kindof hedge, has disjunctive space and protection function. Using the thorny fence disjunctivespace and protection function to replace metal highway gelizha, not only can satisfy thesealing isolation to ensure driving safety function, and can significantly improve the effectof highway greening and landscape viewing. But because the environment of highway inthe arid area, the thorny fence plants should have strong ability of drought resistance.Choose Rosa rugosa, Gleditsia sinensis, Zanthoxylim bungeanum and Rosa xanthina fourthorny fence plants for material, adopt the method of simulating natural drought, studiedthe influence of drought stress on the photosynthetic and physiological characteristics,comparison of the four kinds of plant drought resistance ability difference, so as tohighway thorny fence will provide a scientific basis for tree species selection andmaintenance management. Paper main research results are as follows:(1) As the aggravate that the degree of drought stress, four thorny fence plants leavesphotosynthetic rate were present the declining trend, and water use efficiency is risingtrend. Drought stress60days, compared with the control treatment, photosynthetic rate ofRosa rugosa, Gleditsia sinensis, Zanthoxylim bungeanum and Rosa xanthina respectivelydecreased by43.7%,29.0%,42.3%and27.9%, and water use efficiency increased by thancontrol, respectively,51.08%,68.31%and59.24%. In the complex water can be returnedto control levels. Through the comparative analysis, photosynthetic rate of four thornyfence plants order is Rosa xanthina> Gleditsia sinensis> Zanthoxylim bungeanum> Rosarugosa.(2) In the process of drought stress, between different plant chlorophyll andcarotenoid content change has certain differences, Zanthoxylim bungeanum and Rosaxanthina roughly slowly rising trends, Gleditsia sinensis fall after rise first, and the Rosarugosa is showed a downward trend.drought stress of30days Rosa xanthina verysignificant difference in total chlorophyll and controlled processing, dropped31.25%thancontrol treatment, and with the intensification of the degree of drought stress, nosignificant difference between the drought treatment; Gleditsia sinensis30days in droughtstress significantly higher than that of chlorophyll, total control processing, maximum of2.113mg/g, as the degree of drought stress continued to rise, total chlorophyll showed a downward trend, and drought stress60days and there is no significant difference betweencontrol treatments; Zanthoxylim bungeanum the drought treatment and contrast differencewas not significant, but the drought stress60days for a maximum of2.056mg/g, only60days drought stress and drought stress had the extremely significant difference for30days,with45days drought stress had significant difference, difference and contrast treatmentwas not significant, at the same time control treatments and there is no significantdifference between the drought stress treatment; Although Rosa xanthina has showed arising trend, but the drought stress there is no significant difference between treatment andcontrol, the differences between each drought stress treatment was not significant.(3) As the extension of drought stress time, Rosa xanthina, Zanthoxylim bungeanumand Rosa rugosa first down later trends, Rosa xanthina and Rosa rugosa pieces of SODactivity in drought stress reach maximum45days,325.92Ug-1FW and580.216Ug-1FW,Zanthoxylim bungeanum in drought stress30days maximum663.425Ug-1FW, and thechange trend of Gleditsia sinensis is declining, roughly60days to drought stress treatmentdecreased by38.5%than control; Rosa rugosa’s POD activity showed a trend of first oflowered later,45days in drought stress peak168.83Ug-1FW, Gleditsia sinensis showedsignificant downward trend,60days to drought stress than control treatment decreased by66.2%, while Zanthoxylim bungeanum and Rosa xanthina performance significantlyincreasing trend,60days to drought stress than ck increased60.12%and24.5%,respectively, after water treatment after all return to control level. SOD and POD presentedthe same change trend, showing the relationship between synergy.(4) In the process of drought stress, MDA content significantly increased with the lossof the soil moisture content,60days to drought stress, Rosa rugosa, Gleditsia sinensis,Zanthoxylim bungeanum and Rosa xanthina respectively increased by27.23%,63.05%,24.56%and31.2%than ck. After water treatment, after45days of Gleditsia sinensis indrought stress treatment failed to return to control levels, drought stress on plant membranesystem caused a certain degree of damage.(5) Through principal component analysis, the four thorny hedge plants areinterrelated in the18monomial index integrated into four independent comprehensiveindex, the comprehensive analysis and evaluation to determine the drought resistance ofthe four thorny hedge plants pecking order is Gleditsia sinensis> Zanthoxylim bungeanum> Rosa xanthina> Rosa rugosa, and when it is applied in highway gelizha, in45dayswithout water, not the Gleditsia sinensis seedling damage, in60days without water, whilecaused some damage to the plant, but not fatal, can be quickly recovered after after water,and the Rosa xanthina，Zanthoxylim bungeanum and Rosa rugosa in drought stress of the45days leaves photosynthetic rate decreased significantly, the plants have also been acertain degree of damage of membrane system, so you need to45days to make thecomplex water in dry processing. In the actual application shall, according to different size of the ability of drought-resistance of different irrigation measures.