沙地云杉林植物区系特征的研究

根据野外调查,分析了沙地云杉林的植物区系成分,进行了种子植物的统计并得出结论:在沙地云杉林中,共有161种植物,分别属于49科,123属。其中1种蕨类植物,2种裸子植物,158种种子植物。共有10种地理成分分布类型,其中以达乌里-蒙古成分占优势,内蒙古自治区的特有成分只有沙地云杉一种。根据优势成分分析,发现在乔木层中只有沙地云杉和白桦达到存在度的4~5级,灌木层中只有黑果木旬子木达到5级。根据相似系数比较发现:沙地云杉林有56.8%的科、47.4%的属、47.4%的种与大针茅草原相同;有60.8%的科、22.3%的属、7.2%的种与长白山的典型暗针叶林相同,因此沙地云杉林仍然属于暗针叶林范畴。

Study on Characteristics of Flora in Picea mongolica Forest

On the basis of investigation,we analyzed the characteristics of flora in Picea mongolica forest,and made a statistic recording of seed plants. There were 161 species which belong to 123 genera in 49 families,where there was only 1 species pteridophyta,there were 2 species gymnosperm belong to 2 genera and 158 species angiosperm belong to 120 genera.There were 10 types floristic geoelements,where DuhuricaMongolica flora was dominant,Palaearctic and Eastern Palaearctic flora followed it.Picea mongolica was unique endemic tree in Inner Mongolia Autonomous Region.According to the analysis on dominant components,we found that there were only birch and spruce in class 4 and class 5 in tree layer,in shrub layer,only Cotoneaster melanocarpa is in class 5.Based on the comparison of coefficient of similarity,we found the parameter of coefficient in spruce forest are 56.8 percent(family),47.4 percent(genera) and 47.4 percent(species) with Stipa Steppe,and 60.8 percent(family),22.3 percent(genera) and 7.2 percent(species) with Changbai Mountain.Furthermore,the spruce forest in sandy land was obviously different with typical dark coniferous forest.