摘要
表土花粉分析是研究花粉代表性问题的重要手段之一。本文通过对昆明地区46块采自不同植被类型样方内的表土样品的花粉分析,说明在该地区的植被条件下,国际通用的半径为20m 的样方内的表上花粉组合不能反应样方植被的特征。这是由于昆明地区森林盖度低和存在大面积松林的缘故。我们建议在定量研究花粉代表性时,应首先确定多数花粉采自样方以内,或选择植被稳定分布的地区进行研究。
Pollen analysis' of surface samples is one of the major means in study of pollen representation. The results of palynolopical study on 46 surface samples collected from plots with different vegetation types show that pollen assemblages in surface samples do not reflect major characteristics of vegetation within 20m radius of the surface samples, which is commonly accepted in forest surface sample studies. This is due to general low vegetation cover and broad distribution of pine forest in the study area. In order to avoid possible effects of large amounts of pollen from outside plots, it is considered necessary to test whether pollen in surface samples is mostly from within plots unler consideration or to choose areas with relatively evenly distributed vegetation before calculation of quantitative correction factors is attempted.
基金
国家自然科学基金资助项目
关键词
花粉
分析
昆明市
代表性
表土
Pollen representation
Pollen analysis of surface samples
Kunming area
