小五台山亚高山草甸物种分布与温度关系研究

通过转化糖方法、植物群落野外调查和实验室分析,分别测得生境效应温度、物种盖度和生物量,应用该数据分析小五台山亚高山草甸植物物种分布与温度的关系.结果表明,在记录到的97种维管植物中,约36%的物种分布受生境温度条件影响,约20%物种的相对盖度与温度变化呈显著相关.生物量或相对盖度与温度呈正相关的有11种植物,相对盖度与温度呈负相关的有8种植物.在物种分布与温度关系的研究中,对频度为90%～20%的物种,采用盖度指标进行分析通常可行,对频度大于90%的物种,采用生物量数据比盖度更为有效.

Relationship between species distribution and habitat effective temperature in subalpine meadow of Mt.Xiaowutai

By the methods of sugar-inversion,plant community field survey and laboratory analysis,this paper measured the effective temperature of habitats,relative coverage of species,and aboveground biomass in subalpine meadow of Mt.Xiaowutai,and analyzed the relationship between species distribution and habitat effective temperature in landscape scale.The results showed that among 97 vascular plant species registered,the distribution patterns of about 36% of total species were influenced by the effective temperature of the habitats,and the relative coverage of about 20% of them correlated significantly with the effective temperature.Eight species showed a negative correlation between their relative coverage and effective temperature,and eleven species had a positive correlation between their relative coverage or aboveground biomass and effective temperature.The eleven species with a positive correlation had certain drought resistance feature or a tendency distributing towards warmer habitats.Concerning the effectiveness of species feature applied in the analysis,relative coverage could be used to determine the relationship between species distribution and effective temperature efficiently,if the species frequency ranged from 90% to 20%.But,for the dominant species with their frequency over 90%,aboveground biomass seemed to be more suitable for the analysis.