作　　者： ; ; (等）;

机构地区： 南京大学生命科学学院

出　　处： 《生物多样性》 2003年第2期147-154,共8页

摘　　要： 低密度种指在热带森林中存在的成年个体密度很低的物种 ,是热带森林中树种的主要存在形式。对低密度种的认识和保护是热带森林生物多样性保育的关键之一。与稀有种相比 ,低密度种的含义更为广阔 ,它还包括那些密度低、分布范围广和绝对个体数量大的物种。低密度种形成的主要原因是母树附近的幼苗和种子的存活率较低 ,密度制约和有限更新也是低密度种形成的重要原因。维持低密度种最重要的外部原因是昆虫较强的飞行能力和传粉能力 ,而其最重要的内部原因是低密度种的生殖特性。 Low-density species are species that occur with a low density of mature individuals. They are the most common species in tropical forests. Knowledge and protection of low-density species are key tobiodiversity conservation in tropical forests. The meanings of low-density species is broader than that of rare species. Low-density species also include species that have low density, wide distribution range and a huge number of mature individuals. Low survivorship of seeds and seedlings near the parent individual is an important mechanism of creation of low-density species. Low-density species probably arise from intraspecific density-dependent effects and limited population recruitment. The possible mechanisms of maintenance of low-density species lie in both external factors, such as capacities of insect pollinating, and inner factors, including flower number and flowering duration of tropical plants. Some tropical species are self-fertilized, compensating for the decline in opportunity for cross-breeding due to extreme low-density. Up to now, few studies have been carried out in this field. We should design more detailed research in combination with research on the properties of tropical forests, so that we can provide a theoretical basis and practical advice for biodiversity conservation in tropical forests of our country.

关 键 词： 低密度种 热带森林 假说 传粉能力

领　　域： [生物学]