印度Garhwal喜馬拉雅之Tons山谷的植生歧異度尤其是有關植物地理的親緣性

Vegetational Diversity in Tons Valley, Garhwal Himalaya (Uttaranchal) India with Special Reference to Phytogeographical Affinities of the Flora

1994-98年間，Garhwal喜馬拉雅之Tons山谷的植生歧異度及植物誌曾經被深入研究，整體而言，在Tons山谷植物誌可鑑定132科，480屬，共761種之顯花植物，植生以常綠及落葉樹種之混淆林森林社會具優勢。分析植物地理之親緣性，Tons山谷植物誌與鄰近地區具有親緣性。植物誌之主要份子為印度、印度－馬來西亞、非洲－亞洲－澳大利亞及舊熱帶省者，歐洲－西伯利亞及中日份子亦出現。

The diversity in vegetation and flora of Tons Valley in Garhwal Himalaya has been extensively studied during 1994-98. On the whole 761 species of phanerogams referable to 480 genera and 132 families could be recognised in the flora of Tons Valley. The vegetation predominantly is of forest communities which is evergreen type intermixed with deciduous species. The vegetational diversity of the area is discussed broadly under: forest vegetation, seasonal vegetation, and aquatic and marshy vegetation. An analysis of the phytogeographical affinities of the flora shows that the flora of Tons Valley has affinities with surrounding regions. There is predominance of Indian, Indo-Malayan, African-Asiatic-Australian and Palaeotropical elements in the flora. Euro-Siberian and Sino-Jananese species have also found their ways to the Tons Valley.