摘要
应用方差检验和2×2列联表方法,对青藏高原黄河源区轻度退化、中度退化和重度退化的高寒草地植物群落物种的种间联结性进行了定量分析.结果表明:黄河源区高寒草地退化明显影响到其植物群落物种间的联结性和关联程度;随着草地退化程度的加剧,群落中主要优势物种的总体种间联结性由显著负相关过渡到无关联,具有相同生活型和水分生态类型的物种则由互生转为竞争的关系;以毒杂草为优势的重度退化高寒草地黑土滩"植物群落的物种间关系随机性较大,物种构成不稳定,它属于一种不稳定的次生植被.
Variance tests and 2 × 2 contingency table analyses were used in quantitative analysis of the interspecific association among the plant species of the three different degraded meadows（light, medium, heavily）in the headwater area of Yellow River on Tibetan Plateau. The results showed that the degradation of alpine meadow affected the interspecific association of plant communities. And with the increased level of the degraded meadow, the overall interspecific association among main plant species of the community transformed from significantly negative association to none. The heavily degraded meadow ‘black-soil-land＇ was dominated by poisonous weed,its interspecific association of community was random, and the composition of species was instable. Therefore,the black-soil-land is a kind of unstably secondary vegetation.
出处
《西北植物学报》
CAS
CSCD
北大核心
2008年第6期1222-1227,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金项目(30600426,30730069)
国家“十一五”科技支撑计划(2006BAC01A02)
关键词
黄河源区
退化草地
黑土滩
种间联结
The headwater area of Yellow River
degraded meadow
black soil land
interspecific association
