中文摘要：

按照居群取样方法,随机选取洛阳市15个狗牙根居群（包括10个野生居群和5个栽培品种居群）,调查了居群狗牙根的生境类型、群落组成及其形态学特性。结果表明：洛阳市狗牙根群落的主要生境是路边、坡地、田坎边、疏林下及河边等;洛阳市狗牙根群落中有17科24属26种伴生植物,主要伴生植物为灰菜、婆婆纳、小白酒草、葎草、莎草、苦苣菜和打碗花等;15个居群中狗牙根形态学特性的变化范围分别是：草层高度0.8～48.7cm、匍匐茎节间长度0.4～12.9cm、匍匐茎节间直径0.04～0.28cm、直立茎叶长0.4～11.6cm、直立茎叶宽0.09～0.45cm。各性状变异系数由大到小依次是草层高度（91%）〉匍匐茎的节间长度（64%）〉直立茎的叶宽（44%）〉匍匐茎的节间直径（43.5%）〉直立茎的叶长（31%）。该研究结果可为洛阳市狗牙根种质资源的开发和利用提供理论依据。

英文摘要：

15 populations of bermudagrass were investigated based on population sampling including 10 wild populations and 5 cultivated populations in Luoyang.The habitat types,community composition and morphological properties were investigated.The results showed that the habitat types in Luoyang were roadside,slopes,ridge side of the river in sparse woods,etc.;the accompanying plants had 26 species from 24 genera in 17 families.The mainly accompanying plants were gray food plants,speedwell,small white grass,Humulus,sedge,Sonchus and Calystegia,etc.;Bermudagrass characteristics had widely variation in Luoyang.Among these characteristics,the coefficient of variation of the height of turf was the highest（85%）whose variation range was from 1.3 cm to 48 cm.The coefficient of variation of leaf length and internode length were 55% and 54%,whose variation range were 0.3~10.6 cm and 0.5~10.2 cm,respectively.The coefficient of variation of leaf width was 28% whose variation range was 0.17~0.5 cm.The lowest coefficient of variation was internode diameter which was 24% and whose variation range was 0.08~0.19 cm.The results of this study could provide a theoretical basis for the development and utilization of bermudagrass germplasm in Luoyang.