中国北方几种灌丛群落表土花粉与植被关系研究

中国北方20个典型灌丛群落主要花粉类型的百分比与植被盖度关系表明:除蒿及沙棘外,其它灌丛群落中,优势植物种的花粉百分比多低于20%。灌木花粉对植被的指示性研究表明:皂荚花粉为适中代表性类型,对植被指示明显。苦豆子、霸王柴、荆条、四合木、锦鸡儿、鼠李、绣线菊、虎榛子、榛、白刺、柽柳、柳等为低代表性类型(R值低于0.3),对植被有一定的指示意义;沙棘、蒿属、藜科花粉为超代表性类型(R值高于1或O值高于0.5),对植被也只有一定的指示意义。虎耳草科、豆科花粉对植被指示意义不明显。

Relationship Between Surface Pollen and Vegetation in Some Shrub Communities of Northern China

As one of important vegetation types,shrubs appear widely in different ecological regions.Parts of them have good indication to vegetation or ecological environment,parts of them can indicate the impact of human to vegetation.Now,in China,the area of shrubs has exceeded the forests.There are lots of researches about relationship between modern pollen and vegetation in forests,steppes and deserts,while very few researches about shrubs,so it is very necessary to study more about the relationship between modern pollen and vegetation in shrubs.In this paper,the study on the pollen assemblages for 53 samples in 20 shrub communities in the northern China showed that the pollen percentages for most dominant shrub plants were less than 20%,apart from Artemisia and Hippophae rhamnoides.The pollen assemblages of shrub communities in different ecological areas had obvious differences.The study on the relationship between the pollen percentages and shrub coverage showed that the pollen percentages of Nitraria,Vitex had significant relationship with their parent vegetation coverage,Tamarix,Artemisia have some relationship with their parent plants in certain extent,while the pollen percentages of Spiraea,Caragana,Leguminosae,Chenopodiaceae have no significant relationship with their parent vegetation coverage.The study on pollen indication to vegetation showed that Gleditsia pollen indicated their parent plants very well and is moderate represented type.Some pollen types,such as Sophora,Zygophyllum,Vitex,Tetraena could also indicate their parent plants well,while they are severely under-represented with the R-values less than 0.3;some other pollen types,such as Caragana,Rhamnaceae,Spiraea,Ostryopsis,Corylus,Nitrinia,Tamarix and Salix are also under-represented for the low R-values,however the strong scattering ability of pollen(O-values are higher than 0.5) making them only indicate their parent plants in certain extent.Pollen types such as Hippophae,Artemisia,Chenopodiaceae are over-represented for the high R-values,the strong dispersing ability or high pollen production(R values higher than 1 or O-values are higher than 0.5) also making them only indicate their original plants in certain degree.Pollen types such as Leguminosae and Saxifragaceae have no obvious indication to their parent plants(Ma values are close to Mp values).