In order to reveal the variation patterns of Bombax ceiba(Bombacaceae)seed size in Nujiang Dry-hot Valley,Bombax ceiba seeds were collected from different habitats of Nujiang Dry-hot Valley.Then seed biomass and diameter were measured to quantify seed size.The regression models were used to analyze seed size variations along environmental gradients in Nujiang Dry-hot Valley.The results are as follows.(1)Bombax ceiba seed size(including mass and diameter)showed normal distributions in Nujiang Dry-hot Valley.(2)Seed size had significant differences among three different dry-hot regions,with values of mild dry-hot region>moderate dry-hot region>severe dry-hot region.(3)Seed size decreased with increasing elevation.(4)Seed size variability also decreased with increasing elevation and drought intensity.These results suggest that Bombax ceiba seeds are under hydrothermal selective pressures,and populations of Bombax ceiba distributed in stable hydrothermal habits produce larger seeds and also have higher seed size variability.
国家科技期刊平台
NSTL
万方数据
