云南潞江坝怒江干热河谷植物区系研究

潞江坝１３００ｍ以下干热河谷地区计有种子植物（不包括栽培）８１科，２５９，３６１种，其中的肠须草属，为云南未见记录的属。本植物区系明显是热带性质，热带，亚热带科占５１．２％，热带属７７．６％；一些属种与印度，非洲甚至美洲稀树草原相同或相似。这意味着该植物区系在起源和联系上较古远，具有古南大陆的残余背景。Ｃ４禾本科植物的分布与气候有相关性。本文认为这类植物的多少可以作为生境干热程度的指标之一。

A RESEARCH ON THE FLORA OF NUJIANG DRY-HOT VALLEY IN LUJIANGBA OF YUNNAN

The recorded number of the seed plants (besides planting)found in Lujiangba dry-hot valley which is below 1300 m amount to 361 species belonging to 259 genera of 81 families. Among them, Enteropogon is found in Yunnan for the first time. The flora, which has 51.5% tropical and subtropical families and 77.6% tropical genera, is obviously a tropical one, and it has close connection with the flora of pantropic, old world tropics, tropical Asia and tropical America.It means that the origin and connection with other tropical flora is quite ancient, reflecting the relict background of Gondwana flora. The distribution of C4 Gramineae plant has some links with climate, in this paper the writer points out that the number of this kind of plants can be used as one of the index to reflect the environmental dryness and hotness.