黄土高原塬区和黄土/沙漠过渡区全新世高分辨率植被变化对比研究

随着孢粉研究分辨率不断提高,许多学者对黄土沉积物进行了高分辨率的孢粉分析。单个剖面的孢粉图谱可以反映研究地区的总体植被变化情况。在研究方法基本相同的情况下,同种花粉在不同剖面的百分含量图谱,可以大体上反映该种植被的分布情况。本文在前人研究的基础上,选取了两个地区六个剖面中八种有生态指示意义的科属进行合成,以此得出:早中全新世,黄土/沙漠过渡带沟谷区的环境条件优于黄土塬区;而在晚全新世,植被的地带性特征才表现得比较明显。对可能的原因进行了分析,但仍需要更多证据和更为深入的研究。

High-Resolution Research on Vegetation of Changes Loess Plateau area and the Desert-Loess Transition Zone in Holocene

Many academicians have recently studied on the sediment of Loess by high-resolution pollen analysis.Pollen spectrum in signal section can reflect the vegetation of change in the place.In the case of the same researchmethod,the content of the same pollen in the different section can reflect the distributionof the plant.On the base of the fruits of predecessor,the authors chose and studied eight sections and categories of six sections in two regions,which have the significance of ecologicalindication.We concluded that: in early Holocene,the environment in the Desert-Loess Transition Zone was better than that in Loess Plateau area,but in the late Holocene,it was manifestthat the characteristicsof belt in vegetation.The authors put forward the possible reasons.The conclusion still need deep study.