Study On Drought Resistance And Salt Tolerance Of Three Native Shrub Species In Shan Xi

The growth and development of plants are affected by the environmental conditions, while the drought and salt stress are the main threats to the northern plants. This experiment to Calophaca sinica, G. microphylla, Forsythia as the object of study by pot experiment method, to study the changes of the three shrubs physiological characteristics under drought and salt stress, and by using the fuzzy subordinate function method of the three native shrub drought resistance and resistance to salt strength to make the comprehensive evaluation. The results are as follows:1, Under drought stress, according to the symptoms of stress and the amount of change in the relative water content of leaves, may reflect differences Three Drought-resistant shrub is Calophaca sinica> G. microphylla> Forsythia.2, Under drought stress, Forsythia MDA content and its protection activity was negatively correlated. However, in about 10 days of drought stress, Calophaca sinica and G. microphylla MDA was positively correlated with the amount of change, their view of Three Bush MDA content, drought resistance were G. microphylla> Calophaca sinica> Forsythia. Under salt stress, Three Bush MDA content and its activity was positively correlated with protection, no protective enzyme Lipid peroxidation have an impact on the content of MDA view salt tolerance were Forsythia> G. microphylla> Calophaca sinica; activity on the protection point of view salt tolerance were Calophaca sinica> G. microphylla> Forsythia.3, According to the changes of proline content reflects Three Bush’s drought resistance of wild honey locust> Lai beans> forsythia; salt tolerance of G. microphylla> Calophaca sinica> Forsythia.4, Under drought stress, Calophaca sinica and wild honey locust chlorophyll synthesis was inhibited compared with late Forsythia, chlorophyll content Calophaca sinica and G. microphylla decline is far less than Forsythia, thus understood, drought resistance were G. microphylla> Calophaca sinica> Forsythia. Under salt stress, Three Bush chlorophyll content in each salinity gradient showed a downward trend, compared with CK, the chlorophyll content of G. microphylla largest decline, thus understood, salt tolerance were Calophaca sinica> Forsythia> G. microphylla.5, Calophaca sinica and Gmicrophylla in a short time can tolerate soil salinity of 0.45% salt stress. Forsythia can endure short-term, soil salinity is less than 0.45% salt stress.6, Using the membership function value Comprehensive evaluation showed that three shrubs drought resistance were: Gmicrophylla> Calophaca sinica> Forsythia; salt tolerance as follows:Calophaca sinica> Gmicrophylla> Forsythia.