云南元江干热河谷半萨王纳植被的植物群落学研究

采用Ｂｒａｕｎ－ Ｂｌａｎｑｕｅｔ 植物群落学研究的理论与方法， 对云南元江中上游干热河谷分布的植被进行考察研究， 把各处取得较典型的１１０ 个样地记录按确限度的原则由下而上归类成１５ 个群丛、５ 个群属、２ 个群目和１ 个群纲， 建立了元江干热河谷萨王纳植被群纲—群目—群属—群丛分类系统综合表和１５ 个群丛表， 以全面深入反映全干热河谷植物群落各级分类单位中各植物种类组成的多优度、存在度、盖度系数、生活型和生长型等特征及其群落结构、生态环境和种型类别。在此基础上， 根据群落的种类组成、结构和生态特征， 确定元江干热河谷植被为萨王纳中“河谷型半萨王纳植被”， 主要是“树萨王纳”和“灌萨王纳”， 肉质刺灌丛属于灌萨王纳。

A phytosociological study on the semi-savanna vegetation in the dry-hot valleys of Yuanjiang River, Yunnan

According to the phytosociological theories and methods of Braun-Blanquet′s school, the regional savanna vegetation of the dry-hot valleys of Yuanjiang river had been investigated Based on the principle of fidelity degree, the typical 110 releves taken from every sampling stands of the dry-hot valleys were sorted up from below to upper into 15 Associations, then into 5 Alliances, 2 Orders and 1 Class A synoptic classification system of Class-Order-Alliance-Association was established for the purpose to reflect deeply the characteristics of all syntaxa there in the aspect of plant component and their abundance-dominancy, presence, cover coefficient, life form, growth form, and ecological environment, community structure, species types and so on Based on these, the dry-hot valley vegetation might be confirmed as“semi-savanna of valley type”, mainly the “tree semi-savanna”and“shrub semi-savanna”, the latter including the succulent thorn shrub