海南草地的类型

本文分析了海南草地的类型及其分布。据优势种的差异，划分出27个群落。用主分量分析 (PCA)法，对27个群落进行排序，把它们分为高草、中草、矮草及季节性积水草地4大类型。绝大部分群落都是次生的，甚至西部台地类似于萨王纳的早中生性草地，也是次生的。但薄果草群落则是原生性草地，是由特殊的土壤条件决定的。 PCA表明，土壤肥力及水分条件是影响不同类型分布的最重要的生态因子。

A STUDY OF THE GRASSLAND IN HAINAN ISLAND

This paper deals with the types and their distribution of the grassland in Hainan Island.Twenty seven communities have been distinguished so far according to dorminance.In these communities.4 types are deter- mined according to PCA. Most of the communities are secondary,which include the communities that have a savanna-like physiognomy in the western part of the island. Leptocarpus disjunctus community is primary and distributed in areas with special soil conditions.Soil fertility and water condition are the most important factors in determining the distribution of the grassland types.