摘要
根据野外样地调查资料,对青海湖区东部沙地植被从区系特征及其物种多样性进行了研究,结果表明:①青海湖东部沙地植被种类组成简单,共有27科58属71种。其中禾本科比重最高为22.535%,其次为菊科占12.676%;再次为豆科占9.8592%;桔梗科等14科比重较小均占1.4085%。②地理成分上,湖东沙地植物区系以世界分布为主,共有16科,湖区植物区系中的优势科均为世界广布科;其次是温带成分10科;热带亚热带成分仅有1科。③生活型以多年生地面芽植物和地下芽植物为主,两者种类系数之和达到76.06%,一年生植物所占种类比重最小。④湖东沙地植被群丛多以单一优势种为主,物种多样性指数H、丰富度指数R1和均匀度指数Jsw三者的变化趋势大致是一致的,即随物种的增多,他们的指数趋向增大;生态优势度C的变化趋势则正好相反。⑤湖东沙地群丛物种相似性差异较大。固定沙地之间植被群丛相似性较高,流动半流动沙地与流动沙地之间则较低。
Investigation data from sampling plots in field were used to study the floristic origin and species diversity in east of Qinghai lake. The results are as follows： ①he species of sandy vegetation are simple, there are 71 species, belonging to 58 genera in 27 families, with the highest proportion families Gramineae, accounting for 22. 535% ; second Compositae, for 12. 676% ; third Legume, for 9. 8592% ; the least Campanulaceae, et al 14 families, only for 1. 4085%. ②In flora, the distribution-type of family of the sandy vegetation in east of Qinghai lake mainly belong to widespresa type, 16 families, having a percentage of 83.1%, and the dominant families of lake area are all of widespresa type; the sandy vegetation secondly belong to the temperate type, 10 families; the tropic type is simple＇, only 1 family. ③On the life form, Hemicrytophytes and Cryptrphytes are the main, which add to 76.06 %, Chamaephyte and Phaenerophyte in the next place, Therophyte is the least. ④The sandy vegetation association in east of the Qinghai Lake is mostly composed by single dominant species. The changing tendency for species diversity index H , richness index R1, and evenness index Jsw show almost the same increasing trend with species increasing; the changing tendency of the ecological dominance is just on the contrary.⑤The species similarity of sandy vegetation association change largely, between 0. 1132 and 0. 5567. The species similarity of fixed dune association is higher, but that of semi-moving and moving dunes are lower.
出处
《中国沙漠》
CSCD
北大核心
2007年第5期820-825,共6页
Journal of Desert Research
基金
国家中西部专项(K99-05-11)"江河源主要生态区生态恢复研究与示范"
关键词
青海湖
沙地植被
物种多样性
Qinghai Lake
sandy vegetation
species diversity
