遮阴生境下假俭草的形态变化与能量分配研究

Study of Morphological Change and Energy Distribution of Centipede Grass under Shade Condition.

设四个遮阴梯度(0%、25%、45%、75%的光照),对遮阴生境下雅安、峨眉两野生假俭草居群的能量分配、形态变化进行了初步研究。结果表明:在遮阴情况下,两假俭草居群的叶片长度和宽度、节间长度、草层高度皆随遮阴梯度的增加而增加,茎的直径随遮阴梯度的增加而下降。在这些指标中,雅安居群随遮阴度变化的幅度比峨眉居群大。两者的生物量主要由地上部分组成,地上生物量与总生物量的比值都在0.88以上。遮阴度越大,两居群地上部分所占的比重也越大。两者相比较雅安的生物量小于峨眉,但地上/总生物量、叶量/茎量的值较大。

To study the morphology change and energy distribution of two centipede grass population under shade condition,Four level of shade(0%、25%、45%、75% of full sunlight) was set in this experiment.Result indicated leaf length,leaf width,internodes length,canopy height of two populations had positive but internodes diameter negative relation with shade degrees.Comparing the two populations,ya'an changed more than emei.Total biomass of two populations was all mainly composed of aboveground-biomass.Ratio of aboveground/total-biomass was all above 0.88,and the higher shade degrees the higher ratio was.Comparing the two populations,ya'an had not so much total-biomass as emei,but the ratio of aboveground/total-biomass,leaf/stolon-biomass were higher.