海南粗榧（Cephalotaxus mannii Hook.f.）化学元素含量及变异研究

 利用变异系数和差异显著性检验，对海南坝王岭等五个海南粗榧群体植株及其不同器官的C、H、N、K等15种化学元素分布及变异进行研究。结果表明：1)海南粗榧(Cephalotaxus mannii Hook．f．)中的化学元素含量分布总体呈Ca>K型，但枝、茎、根、种子等不同器官却表现为K>Ca型；2)海南粗榧群体内各化学元素含量的变异系数较大，但群体内和群体间基本无显著差异；3)海南粗榧不同群体同一器官间元素含量相对稳定，变异系数不太大，群体不同器官间则呈现显著甚至极显著的差异，但不同器官的总体平均值却无显著差异。

VARIATION IN CONCENTRATION OF CHEMICAL ELEMENTS IN CEPHALOTAXUS MANNII HOOK.F. AMONG POPULATIONS AND MODULES

Variation in concentration of fifteen chemical elements was studied in genet and module populations of Cephalotaxus mannii Hook. f. in Hainan. This variation was examined using variance coefficients and difference significance tests. The populations had greater Ca relative to K, but the module populations, branch, stem, root and seed, showed the reverse pattern. The contents of chemical elements had higher variance coefficients within populations but no significant difference among populations. The concentrations of chemical elements were comparably stable and their variance coefficients small in populations of the same genet. Among the different modules of single populations, significant or highly significant differences were observed, though these were not observed in the averages of module populations.