Studies On The Growth Rules And Major Influence Factors Of Two Endangered Resource Plants Notoptergium Spp

Two wild medicinal resource plants, Notopterygium incisum and N. forbeii, have to be faced with more and more serious over-exploitation under the pressure of population and economy development owing to wild resource collection, vegetation destruction, habitat fragmatation, and lands reclamation. The short growth phase and long growth cycle in plateau regions with high altitude and cold weather of two species make this crisis more rigorous. Lack of basic studies, such as physiological and ecological conditions, restricts naturalization and cultivation of these two species. Medicinal materials still have to rely on wild resource collection, which makes the two plants extinction in some areas. In order to explore the theories and methods for naturalization and cultivation practices, studies on environmental soil science under wild condition, and growth and photosynthesis rules under the cultivation conditions, as well as influence factors have been carried out. The major results are showed as follows.1. With respect to fertility of soil, the soil organic matter content of N. forbesii is lower than that of N. incusium. However, soil available nitrogen and phosphorus of forbesii are both higher than those of incisum. .With regard to soil exchangeable base cations, the soil exchangeable Ca and Mg of N. incusium are higer than those of N. forbesii, which is resulted from high content of organic matter, especially the humus, in soil of N. incusium. Generally, the soil of N. forbesii is characterized by higher exchangeable K.With respect to soil microelements, microelements concentrations in plants vary...