Abstract:
There are two methods for
Symplocos laurina propagation:clonal reproduction and sexual reproduction,which play significant roles in forest regeneration.Point pattern analysis,based on spatial mapped points of individuals' distribution,was employed to obtain spatial pattern of ramets and sexual seedlings of
S. laurina in different habitats,as well as the relationship between them.The results showed that densities of ramets and sexual seedlings in different habitats had the same order,ie evergreen broadleaved forests>bamboo forests> needle broadleaved forests.In habitats with abundant water and fertility and lower light,such as in an evergreen broadleaved forests or a bamboo forests;clonal ramets took advantage in terms of number and clonal propagation was dominant. In habitats with a lack of sufficient nutrition and with stronger sunshine,the densities of both ramets and sexual seedlings were high;and sexual seedlings had much more individuals than ramets.The seedlings of
S.laurina clumped in bamboo forests and needle broadleaved forests.The distribution pattern varied with the increase of scale from clumping distribution to random distribution in an evergreen broadleaved forests.The relationship between ramets and sexual seedlings were almost significantly positively correlated with each other in bamboo forests and needle broadleaved forests.The relationship also changed with the increase of scale in an evergreen broadleaved forests,with positive association on the smaller scale,and negative association on a larger scale.This indicates that scale is an important factor in controlling the spatial distribution pattern of
S.laurina seedlings.