科尔沁沙地榆树疏林草地物种多样性及乔木种群空间格局

应用多样性指数对科尔沁沙地榆树疏林草地的物种多样性进行了研究,并用空间格局指数测定了乔木种群的分布格局。结果表明,灌木层多样性较低,而草本层物种多样性较高。在生活型功能群中,一、二年生草本处于优势地位,多年生草本具有稳定群落的效应;在生态功能群中,旱生、中生植物占有主体优势,但在群落中又存在植物功能互补效应。乔木种群的分布格局呈现出聚集分布,在其发育过程中具有不同的动态变化特征,即幼苗、幼树阶段为聚集分布,到了成树阶段为随机分布。

Species Diversity and Arbor Population Distribution Pattern of Ulmus Pumila L Scattered Grassland of Horqin Sand

Diversity Indices were applied to analyze the species diversity of sparse Ulmus Pumila L forest pasture, and contiguous grid quadrats were used to test the distribution pattern of arbor population.Compared with the broad-leaved forests in subtropic , temperate zones and the forest on eastern slope of Mt. Gongna, the results show that the species diversity ofshrub stratum is relatively lower, while that of the herb layer relatively higher. Inlife form functional groups, annual and biennial herb are dominant population, while perennial herb have a importantrole to the stability of community. In Ecological groups, xerad and mesophytes are main bodies in community, however ecological groups remain highly functional diversities. The distribution pattern of arbor population is clump, but it is dynamic during the process of plant growth. Its pattern changes from clump to randomwith the growth of trees from seeding or young trees to adult trees.