Soil Physical and Chemical Properties in Phalaenopsis pulcherrima (Orchidaceae) Habitat in Bawangling Natural Reserve, Hainan Island

The soil is the matric which can directly impact on the growth and development of plants.In order to uncover the characteristics of soil in Phalaenopsis pulcherrima habitats and the difference between the two different ecotypes distributed,we set six quadrats in Bawangling nature reserve in Hainan island,where there are P.pulcherrima.We analyzed the water content,pH and contents of nitrogen,phosphorus and potassium of each soil sample,we also classified size index of P.pulcherrima individuals according to clonal ramets and biological properties,which indicates the plant biomass.We also analyzed correlation size index and the characteristics of soil,and compared these physical and chemical properties between the two ecotypes.The results revealed that the soil was acidic and rich in nutrient contents.There are remarkable difference in physical and chemical properties between different samples;and there are also difference in size index of P.pulcherrima between different quadrats.Besides,size index and soil properties showed positive correlation.All the indexes of the soil sample which P.pulcherrima grew in with red leaf dorsal are higher than that with green leaf dorsal.These results may have important value forguiding cultivation of tissue culture seedling and exploring spatial-temporal dynamics of P.pulcherrima population.