独叶草花叶比和花期营养分配的研究

Study on the Ratio of Flower to Leaf in Relation to the Allocation of Nutrition in Blossom Period of Kingdonia uniflora

采用野外调查和统计的方法,对独叶草40个样方中的花叶比和花期营养分配进行了研究,结果表明每个样方中具花0～23朵,其中无花的样方6个,占总样方数的15.0%;4～13朵花的样方共30个,占总样方数的75.0%。其花叶比为0～0.308,平均每个样方为0.107。除个别情况外,样方中叶的数目过少(少于40)的情况下,一般没有花或花的数目很少;随着样方中叶数目的增多,花的数目也有增多的趋势,但当叶数目增加到一定程度(大于121)时,花的数目不再增加。独叶草花期样方中花重占花和叶总重的0～30.2%,一般在10%～20%之间。根据上述结果,我们认为独叶草花期用于生殖生长的营养分配偏低,而且营养生长与生殖生长之间存在着对抗,这可能是导致该种濒危的原因之一。

The ratio of flower to leaf ratio and nutrition allocation during blossom period of Kingdonia uni flora were analyzed in accordance with the field survey in 40 plots of 1m2 sample units.The result showed that the number of flower changed from 0 to 23 in different units.Among the units 6 of them （15.0%of the total units）were without flowers and 30 of them（75.0%of the total plots）had 4～13 flowers.The flower to leaf ratio was 0～0.308,with the average of 0.107 in each unit.There were few flowers in the units,with a few exception of units having leavess 40 or less.When the number of leaves increase,the number of flowers increase also.But when the number of leaves in a unit increases over 121,the number of flowers in the unit will keep stable.The weight of flowers in the units was 0～30.2%of the total flowers weight during blossom period and average was 10%～20%.Based on analysis above,allocation of nutrition to propagation was lower and the competition of nutritional growth and propagation need existed,which might lead to Kingdonia uni flora endangered.