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

APPLYING CANONICAL CORRESPONDENCE ANALYSIS TO STUDY NICHE DIFFERENTIATION OF SPECIES OF POLYTRICHACEAE IN CHANGBAI MOUNTAINS

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。

c The relationships of 13 species of Polytrichaceae in 30 sites in main ecosystems in Changbai Mountains with environmental factors were studies by canonical correspondence analysis (CCA). The results showed that there are niche differination among the 13 taxa in altitude, soil sand content, water content, acidity and light. The ecological similarities are higher among Polytrichum sphaerothecium, Polytrichastrum alpinum var. brevifolium in altitude, Polytrichastrum ohioense, Polytrichastrum formosum, Polytrichum piliferum,Polytrichum juniperinum in light, Polytrichum commune and Polytrichum juniperinum ssp. strictum in soil water content and acidity.