中文摘要：

河北省中南部82个农田表土花粉组合研究表明：农田花粉组合不仅有农作物花粉类型,也有临近山区的植物成分。山区农田乔木花粉含量与浓度高于平原,对平原的影响随距离增加而降低,距太行山0～50km松属花粉含量为20%～30%,50～100km为10%～20%,100～150km增至20%～30%,海滨区降至16%以下,平原中部含量增加可能与焚风效应有关;山区至平原乔木花粉含量空间上的变化,可能类似于历史时期人类活动介入森林区后时间上的变化。山区和平原灌木花粉含量较低,但主要成分不同,山区以胡颓子科、榛属、虎榛子较常见,平原区蔷薇科、葡萄科花粉相对较多。平原区草本花粉含量高出山区,其中藜科花粉由山区向平原逐渐增高,可能反映人类活动不断增强的特征。山区中华卷柏含量高于平原,但平原区高达7%。中华卷柏不易被风搬运,推测平原区农田的中华卷柏可能是平原沉积时由河流从山区搬运而来。相同类型农业单元乔木、灌木花粉和蕨类百分比山区一般高于平原,草本低于平原;不同类型农业单元乔木、草本百分比平原区相近,山区差异较大。山区乔木花粉含量差异主要受草本类型影响,平原区草本花粉组合差异主要是农作物花粉（人工禾本科、十字花科）含量的差异;不同农业单元孢粉浓度差异主要为草本花粉浓度不同。

英文摘要：

The study on 82 surface soil pollen samples from different types of cultivated vegetations in central and southern parts of Hebei Province indicates that the pollen assemblages from farmlands on the plain have not only their own plant types,but also the pollen components from the nearby mountains.Arboreal pollen percentages and concentrations（dominated by Pinus） of samples from the farmlands in the mountains are higher than those on the plains,and it reduces gradually with the increasing distance away from the mountains.Taking Pinus in Taihang Mountains for example,its content is 20%-30%,10%-20%,20%-30% and below 16% respectively for the samples from the area of 0-50,50-100,100-150 and more than 150 km away from the east of Taihang mountains.The increase of Pinus proportion in the central plains is probably related to the fohn effect.The spatial variation of AP from mountains to plains in Hebei Province may be similar to the historical change of forests clearance by human activities in early period.Shrubby pollen proportion is small both in mountains and in plains,but their major components are different.Elaeagnaceae,Corylus,Ostryopsis and Oleaceae are common in mountain farmlands,while there are relatively high contents of Rosaceae and Vitaceae in plains,Herb content in plains（about 60%） is 15% higher than that in mountains,among which the Cereals and Cruciferae pollen percentages are 5% and 2% higher respectively.Artemisia pollen percentage on the plains is lower than that in the mountains.Since the human activities are weaker in mountains compared with that on the plains,the general trend is that Chenopodiaceae pollen increases from mountains to plains gradually,reflecting the raising intensity of human activities.The fern spores of Selaginella sinensis in mountains are higher than that on the plains,which is about 7%.The fern spores of Selaginella sinensis are not prone to be spread by wind,indicating that those in the surface soil of the plains may be carried by currents from mountains during the dep