Abstract:

In order to evaluate drought resistant ability of different seedlings in karst area and to establish a simple and applicable index system of drought resistance identification, seedlings water potential, hydraulic architecture, water retaining capacity and intensity of water consuming had been studied by hydraulic architecture theory and the author further discussed the difference of seedlings in potential of water absorption, efficiency of water transportation and distribution, water retaining capacity and intensity of water consuming. Furthermore, drought resistance of different seedlings was comprehensive evaluated and ‘method of subordination function’ and ‘method of coordinate composite evaluation of multiple dimension space’ was compared. The result showed that the evaluation results was Cinnamomum camphora (Linn.) Presl>Fokienia hodginsii (Dunn) Henry et Thomas>Platycladus orientalis (Linn.) Franco>Robinia pseudoacacia L.>Broussonetia papyrifera >Elaeocarpus sylvestris (Lour.) Poir. by method of subordination function and the contribution rate of different process of water transportation was different in different tree species seedling; the evaluation results was Robinia pseudoacacia L.>Platycladus orientalis (Linn.) Franco>Cinnamomum camphora (Linn.) Presl>Broussonetia papyrifera>Fokienia hodginsii (Dunn) Henry et Thomas>Elaeocarpus sylvestris (Lour.) Poir. by method of coordinate composite evaluation of multiple dimension space. The method of coordinate composite evaluation of multiple dimension space was relatively suitable under condition of less tree species