长白山地区曲尾藓属植物生态分化的排序研究

The relationships of eight moss species of Dicranum in 31 sites in main ecological systems in the Changbai Mountain with environmental factors were studied by canonical correspondence analysis (CCA). The results showed that altitude, soil sand percentage, water percentage, acidity and canopy density were important environmental factors influencing the distribution of the species of Dicranum . The relationships between Dicranum elongatum Schleich. ex Schwaegr ., D.groenlandicum Brid. and altitude,between D.japonicum Mitt., D.scoparium Hedw. and canopy density,between D.polysetum Sw., D. undulatum Schrad. ex Brid. and soil acidity and water percentage,were positively correlative. The niche overlaps among the eight species of Dicranum were calculated. The minimal spanning tree of the eight species on the two-dimensional scatter plot were also drawn based on their niche overlaps, which clearly revealed the ecological similarities of eight species.

应用典范对应分析探讨长白山金发藓科植物的生态位分化

应用典范对应分析 (CanonicalCorrespondenceAnalysis,CCA)对长白山主要生态系统 30个样点中的 1 3种金发藓科植物分布与环境因子间的关系进行了研究。发现在长白山地区 ,金发藓科植物在海拔高度、土壤含砂量、含水量、酸度、光照条件等资源维上存在明显的生态分化现象。 1 3种金发藓科植物中 ,球蒴金发藓(Polytrichumsphaerothecium (Besch .)C .Mull.、高山异发藓短叶变种 (Polytrichas trumalpinumvar.brevifolium (R .Br .)Brid .)在海拔上 ,拟异发藓 (Polytrichas trum formosum (Hedw .)G .L .Smith)、变形异发藓 (PolytrichastrumdicipensLimpr.)、毛尖金发藓 (Polytrichum piliferumSchred .exHedw .)、桧叶金发藓(PolytrichumjuniperinumWilld .exHedw .)在光照上以及大金发藓 (PolytrichumcommuneHedw .)、直叶金发藓 (Polytrichum juniperinumssp .strictum (Brid .)Nhy .&Sael.)在土壤酸度与水分上的生态要求比较接近。