2008•Yunnan Daxue xuebao. Shehui kexue banRequires access
A study on the flora of seed plants in Lancang River(in Tibet)
Yang Shu-hua
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Abstract
Based on investigation and statistics,the result showed: the seed plants resource in Lancang River(in Tibet) consist of 68 families,396 species belong to 204 genera(include varieties and subspecies).Among them,4 families,7 genera,14 species belong to gymnosperm,and 64 families,197 genera,382 species to angiosperm;In composition of seed flora,the larger families(include 20 to 35 species) and medium families(include 10 to 19 species) are sum to 10 families,230 species belong to 89 genera,which accounted for 14.71%,43.63% and 58.08% of the respective species,genera and families of seed plants in this watershed,indicated that medium families and larger families plays a critical role in constructing of flora in this watershed,while the big family(include over 10 families) covers a very small proportion,the quantitative change of genera and species are almost the same;In the plant genera of the floristic elements,the distribution in north temperate zone is reached 83 genus,account for 47.16% of the total number of genera,has an absolute predominance of the genera in this watershed,showed significant north temperate zone characteristic;Chinese enDEMic distribution just has 2 genera,account for 1.14%of total number of genera,which showed the feature of enDEMic to this flora is not rich in this watershed.