Vegetative Characteristics in the Dry Valley of the Middle Reaches of Nujiang River in Tibet, China

doi:10.3724/SP.J.1143.2011.10250

Abstract

Abstract:

Based on statistical analysis of the characteristics of the vegetation in the dry valley in middle reaches of the Nujiang River in Tibet, it is revealed that: (1) There are 85 vascular plant species belonging to 55 genera in 34 families, including 4 ferns belonging to 4 genera in 4 families; 1 species of Gymnosperm; 79 species of Angiosperm belonging to 50 genera in 29 families. 13 arealtypes of the seed plants genera can be recognized, but mainly Pantropic (21.6%). 45 (57.0% of the total) species endemic to China are found, of which 42 (53.2%) species are endemic to SW China and 3 (3.8%) species endemic in Tibet. (2) Four main lifeforms, the Nanophanerophyte, the Hemicryptophyte, the Chamaephyte and the Therophyte, can be recognized, of which the Nanophanerophyte is highest, occupying 41. 2% and the Hemicryptophyte accounting for 40% of the total. (3) Based on the Raunkiaer frequency analysis, Sophora davidii, Sellaginella pulvinata, Cymbopogon distans, Sinopteris albofusca occurring in over 10 transect plots are among the highest frequency degrees with frequent percentage as 68.2%, 50.0%, 50.0%, 45.5%, respectively. (4) Based on the climate features and severity of drought, the characteristics of the ecological status, the living forms of communities with very low degree of plant coverage, the vegetation belongs to riparian arid desert type.

Key words: Middle reaches of Nujiang River, Wasteland vegetation, Dry valley

CLC Number:

Q 948.2

ZHUANG Cui-Zhen, DU Fan, LIU Ning, ZHANG Hui, CHEN Yong, DU Xiao-Lang. Vegetative Characteristics in the Dry Valley of the Middle Reaches of Nujiang River in Tibet, China[J]. Plant Diversity, 2011, 33(4): 433-442.

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