摘要
基于实地调查资料,对西藏境内怒江中游河谷的特殊荒漠型植被进行了研究。结果表明:(1)22个样方中有85种维管植物,其种子植物属的分布区类型以泛热带分布为主,占21.6%;种以中国特有分布中的西南特有成分为主,占53.2%;(2)生活型谱以矮高位芽植物为主,占41.2%,地面芽植物占40.0%;(3)采用Raunkiaer频度分析,出现在10个以上样方中的物种有白刺花、垫状卷柏、芸香草和阔盖中国蕨等,频度分别是68.2%、50.0%、50.0%、45.5%;(4)根据该河谷区域的气候特点、干旱程度、群落的生态外貌特征和生活型等,并结合《中国植被》对灌丛和荒漠的划分,认为该河谷区域的植被盖度极低,不属于灌丛类型,而是非地带性的干旱河谷型荒漠植被。
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 fami- lies, including 4 ferns belonging to 4 genera in 4 families; 1 species of Gymnosperm; 79 species of Angiosperm be- longing 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 Hemic- ryptophyte, the Chamaephyte and the Therophyte, can be recognized, of which the Nanophanerophyte is highest, oc- cupying 41. 2% and the Hemicryptophyte accounting for 40% of the total. （3） Based on the Raunkiaer frequency a- nalysis, Sophora davidii, Sellaginella pulvinata, Cymbopogon distans, Sinopteris albofusca occurring in over 10 tran- sect plots are among the highest frequency degrees with frequent percentage as 68.2% , 50.0% , 50.0% , 45.5% , re- spectively. （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.
出处
《植物分类与资源学报》
CAS
CSCD
北大核心
2011年第4期433-442,共10页
Plant Diversity
基金
西南山地森林资源保育与利用省部共建教育部重点实验室资助
关键词
怒江中游
荒漠植被
干旱河谷
Middle reaches of Nujiang River
Wasteland vegetation
Dry valley
