A Study On The Relationship Between Water Physiological Characteristic And Drought Resistance Of 6 Tree Species Seedlings In Karst Area

In this experiment, three intensities of soil drought stress treatments and four control treatments have been set up, and each treatment has five repeats, adopting method of physiological ecology to explore the adaptive mode and way of 6 tree species seedlings with water deficiency. Moreover, their drought-enduring adaptability has been evaluated in order to provide theoretical basis for vegetation restoration and reconstruction in southwest karst rocky desertification of mountainous region. Main results are as follows.1. Leaf water potential of six tree species was measured under normal and drought tress, then its potential of absorption was evaluated by subordinate function method. The result showed Orientalis>Cipressus duclouxiana >pseudoacacia >Cinnamonum campora > Broussonetia papyrifera >Elaeocarpus sylvestris.2. Parameter of hydraulic architecture of six tree species was measured under normal and drought tress, and water transportation efficiency's characteristic was evaluated by subordinate function method. The result showed pseudoacacia > Broussonetia papyrifera >Cinnamonum campora >Orientalis > Elaeocarpus sylvestris > Cipressus duclouxiana.3. leaf water content and leaf water relative content of six tree species was measured under normal and drought tress, and the holding water capability of seedlings was evaluated by subordinate function method. The result showed Cinnamonum campora > Cipressus duclouxiana> Elaeocarpus sylvestris.> pseudoacacia > Broussonetia papyrifera > Orientalis.4. Water consumption of six tree species was measured under normal and drought tress, and the capability of water consumption of seedlings was evaluated by subordinate function method. The result showed: Cinnamonum campora > Cipressus duclouxiana> Elaeocarpus sylvestris.> pseudoacacia > Broussonetia papyrifera > Orientalis.5. Six tree species seedlings'drought resistance was evaluated by method of subordinate function and coordinate composite evaluation of multiple dimension space and the result was compared. Coordinate composite evaluation of multiple dimension space method is better if the amount of tree species is less.