Caohai wetland is the largest natural freshwater wetlands lake in Guizhou province, which has typical plateau Karst wetland characteristics. It is the main wintering habitat of Grus nigricollis, which is a national level protection birds. Previous studies mainly concentrated on the lake eutrophication, heavy metal contamination of soil, spatial and temporal distribution of phytoplankton and hydrobiontes, ecological restoration and so on. Research on forest ecosystems in Caohai wetland basin catchment area rarely reported. In this study, the typical standard plot survey, community quantitative characteristics and Kikvidze-Ohsawa dominant species determination method were adopted to analyze the dominant species and community quantitative characteristics in different degree of slope. The results show that:(1)The forest community in the Caohai karst wetland watershed is determined by Pinaceae, Fagaceae, Ericaceae, Rosaceae, Caprifoliaceae, Gramineae, Cyperaceae and Asteraceae. (2)Using IV-Kikvidze-Ohsawa the dominant species evaluation method, the proportion of dominant species of forest community decreased and then increased with increasing slope. The inflection points happened in, respectively, slope for forest communities compared with steep slopes for shrubs and herbaceous communities. (3)Using SDR4-Kikvidze-Ohsawa the dominant species evaluation method, the dominant species proportion of forest community showed an increasing trend with increasing slope, but the proportion of dominant species of shrubs and herbaceous communities decreased and then increased with increasing slope, both of the inflection points happened in steep slope. (4)The community information quantity was directly affected the conclusion in the process of analysis the proportion of community dominant species by using Kikvidze-Ohsawa the evaluation method combined with the community quantitative. Therefore, in the process of analyzing proportion of community dominant species, community quantitative indicators which contain more plant population information should be selected.% 草海湿地是贵州省最大的天然淡水湿地湖泊，具有典型高原喀斯特湿地特征，作为国家一级保护鸟类黑颈鹤的主要越冬栖息地，对其展开各方面研究具有重要意义。之前对草海的研究主要集中在湖泊水体富营养化[1-2]、土壤重金属污染[3-5]、浮游植物与水生生物时空分布及保护区生态环境恢复等领域，而对草海湿地流域汇水区域森林生态系统的研究鲜有报道。采用典型标准样地调查法、群落数量特征和Kikvidze-Ohsawa优势种判定法，对草海湿地流域不同坡度的森林植物群落优势种及群落特征进行分析。结果表明，(1)草海喀斯特湿地流域森林群落主要以松科(Pinaceae)、壳斗科(Fagaceae)、杜鹃花科(Ericaceae)、蔷薇科(Rosaceae)、忍冬科(Caprifoliaceae)、禾本科(Gramineae)、莎草科(Cyperaceae)、菊科(Asteraceae)等植物为主。(2)采用IV-Kikvidze-Ohsawa优势种评判法对不同坡度森林植物群落优势种比例分析发现，随坡度的增加优势种比呈现出先减少后增加的趋势，乔木群落优势种比例变化拐点在斜坡，灌木和草本群落拐点在陡坡。(3)采用SDR4-Kikvidze-Ohsawa优势种评判法对不同坡度森林植物群落优势种比例分析，发现乔木群落优势种比例随坡度的增加而加大；灌木和草本群落优势种的比例随坡度的增加先减少后增加，优势种比例变化拐点为陡坡。(4)结合植物群落数量与Kikvidze-Ohsawa优势种评判法对植物群落进行分析发现，群落数量指标所包含信息量的多寡直接影响分析结果，因此在对群落优势种的研究中，应选择包含种群信息量较多的群落数量指标。
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