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中文摘要：
植物群落学分析以演绎式的生态解释转向归纳式的实验研究。本文运用法瑞学派（Braun-Blanquet）调查分析和群落功能群分类方法，通过比较内蒙古呼伦贝尔克氏针茅草原不同放牧梯度上群落组成结构、特征种及群丛单位的变化，阐明群落物种组合规律。结果显示：根据Braun-Blancluet存在度／盖度等级的划分，得到两个主要群丛及下属两个亚群丛；随着放牧强度的增强，葱属植物等耐牧、耐旱物种出现频度显著增加，适口性好、耐牧能力弱的物种出现频度降低甚至消失；群落科构成和功能群类型在牧压梯度上呈现不同的变化特征，群落物种数和多样性指数具有显著差异。
英文摘要：
Phytosociology is the study of the composition, distribution and relationships between different spe cies in plant communities. This study used the Braun-Blanduet and functional grouping methods to clarify the rules governing community structure and species characteristics in the Hulunbuir （Stipa krylovii） steppe under different grazing intensities. Two main associations and two sub-associations were found. Following increased grazing intensity, those species with good resistance to grazing and drought, for example, AHium species were frequently present while the frequency of palatable species reduced, some disappearing. There were significant differences in community structure, species number and diversity index due to different grazing intensities.
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