青藏高原南部上新世花粉植物群及其古气候

<正> 在青藏高原南部,上新世沉积物主要是山间湖盆沉积物,而山间湖盆沉积物的花粉源,主要来自邻近山地不同植被带的植物和邻近开阔地的植物,因此,其花粉谱往往是不同植被类型植物所产花粉的综合物。花粉谱中存在的这种叠加,造成了古植被和古环境重建的复杂性,也使研究者难于对花粉谱作直接的生态解释。而主成分分析可使分解此

Pliocene palynoflora and paleoclimatc in the southern part of Xizang-Qinghai Plateau

50 samples from six sections of Pliocene in the southern Xizang-Qinghai Plateau are selected for palaeoecological interpretation by principal components analysis, six vegetation types are reconstructed, which are evergreen conifer forest, cedar forest, cedar-oak forest, coniferous and broadleaved mixed forest, oak forest and scrub steppe. Based on the results of principal components analysis and climatic index of modern analogue of paleovegetation types, paleoclimate of Pliocene including coldest month temperature, warmest month temperature, mean annual temperature and annual precipitation is estimated in the southern Xizang-Qinghai Plateau.