Genetic diversity of central and peripheral populations of Toona ciliata var. pubescens, an endangered tree species endemic to China Characteristics of Phosphorus Utilization in Families of Toona ciliata var. pubescens Fruiting Characteristics and Sexual Fecundity of Toona ciliata var. pubescens Populations in Jiulianshan National Nature Reserve Spatial Genetic Structure of Toona ciliata var. pubescens Populations in Terms of Spatial Autocorrelation Analysis Ecogeographical Distribution of Toona ciliata var. pubescens and Preliminary Observation on its Introduction in Nanjing Effects of Water Stress on Seedling Growth and Biomass Allocation of Toona ciliata var. pubescens