Study On The Adaptability Of Sanyemutong To Rocky Desertification Habitat

In rocky desertification habitat,the soil layer is shallow,arid and barren,so many plants are difficult to survive Akebia trifoliata,as a suitable species in rocky desertification habitat,is resistant to drought and barren,and can be used for ecological management in rocky desertification area.In this study,A.trifoliata was planted in rocky desertification habitat and common habitat(control)in Huaxi District of Guiyang city and Guanling County of Anshun City,Guizhou Province,to explore the effects of rocky desertification habitat on the morphological structure,growth and physiological characteristics of root,stem,leaf and other organs of A.trifoliata.The main results are as follow:1.The effects of rocky desertification habitat on the growth index of Akebia trifoliata were determined.The morphological indexes of A.trifoliata in rocky desertification environment showed that the growth of plants was slow,the stems and vines were thin and short,and the number of leaves.Leaf area and number of first-order branches was significantly reduced.2.The response of leaf structure of A.trifoliata to rocky desertification habitat was clarified.The results showed that the thickness of upper epidermis(UE)was thinner,the thickness of palisade tissue(FO)increased and appeared two-layer structure,the thickness of sponge tissue(ST)was thinner,the total thickness of leaves(LT)was thinner,and the density of mesophyll tissue(CTR)increased.3.The physiological response of Akebia trifoliata to rocky desertification was clarified.The results showed that the net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs)and water use efficiency(WUE)of Akebia trifoliata decreased,the intercellular CO₂ concentration(Ci)was higher,the chlorophyll a,chlorophyll b and relative water content(RWC)decreased significantly;the protective membrane system showed that the relative electrical conductivity(RC)of leaves increased significantly,and the content of roots,stems and leaves increased significantly The results showed that the contents of MDA increased significantly,the activities of cat,pod and SOD in roots and leaves increased,and the contents of ASA increased;the contents of SP and pro in roots,stems and leaves increased,and the contents of SS in roots increased;the metabolic system of secondary substances:roots The contents of tannin(TA),total phenols(TP)and flavonoids(FA)in leaves,stems and stems were significantly increased,and the contents of oleanolic acid(OA)and?-hederin(HD)were also significantly increased.4.The results of principal component analysis showed that A.trifoliata adapts to rocky desertification habitat with the changes of vine length in plant morphological indexes,spongy tissue in leaf structure and membrane lipid peroxidation system in physiological indexes as main response indexes.