黄河源区退化高寒草地植物种间联结性分析  

Analysis of Interspecific Association in Degraded Meadow Communities in the Headwater Area of Yellow River on Tibetan Plateau

作　　者：徐松鹤[1,2] 尚占环[2] 马玉寿[3] 龙瑞军[2] 

机构地区：[1]甘肃农业大学草业学院,草业生态系统教育部重点实验室,中-美草地畜牧业可持续发展研究中心,兰州730070 [2]青藏高原生态系统管理国际中心,兰州大学,草地农业科技学院,兰州730020 [3]青海省畜牧兽医科学院草原研究所,西宁810016

出　　处：《西北植物学报》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)

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.

关 键 词：黄河源区 退化草地 黑土滩 种间联结 

分 类 号：Q948.122.1[生物学—植物学]