中文摘要：

以通辽地区科尔沁草地为研究对象,采用样地调查探析该地区草地植物种质资源数量特征。结果表明：通辽地区科尔沁草地的植物种类组成十分丰富和复杂,共有42科,163属,276种,其中优良牧草种类占35.15%;可将草地类型划分为5大类、7个亚类、17个草地组,其中以羊草（Leymus chinensis）为建群种的群落占主要优势,分布最为广泛;因此,本文深入研究了羊草群落的生物量与物种多样性、地理分布的关系,即羊草群落随着物种多样性的增加,群落地上生物量明显增加,呈正相关关系;同时,羊草群落的地上生物量也受到地理因子变化的影响,地上生物量随着经度升高而增加,随着纬度升高而降低。本研究对增加该地区优质牧草产量、改良退化草地、发展草原畜牧业提供了重要的科学数据,对于更好恢复和管理该地区重要的草地资源以及地区经济发展具有重要意义。

英文摘要：

In this paper,the quantitative characteristics of plant germplasm resources in Horqin grassland of Tongliao area were studied by using sampling-plot method.The results show that it is quite abundant and complicated for species composition of plants in Horqin grassland with 42 families,163 genera,and 276 species,of which the fine-pasture species accounted for 35.15%.The types of grassland can be divided into 5 categories,7 sub-categories and 17 grassland groups.Among them,the community in which Leymus chinensis is the constructive species is most widely distributed.The aboveground biomass of L.chinensis community significantly increases with the increase of species diversity.Meanwhile,the aboveground biomass of L.chinensis community varies with the geographical factors,i.e.the grassland aboveground biomass increases with the increase of longitude and decreases with the increase of latitude.Our results provide some important insights for increasing the yield of high-quality pasture,improving degraded grassland and developing grassland animal husbandry.Furthermore,this study provides an important reference for the restoration and reconstruction of Horqin grassland,and thus the local economic development of the study area.