香港-大亚湾近岸海域表层沉积物的孢粉分布规律

对香港大亚湾近岸海域表层沉积物的孢粉分析结果表明．蕨类孢子占绝对优势，其次是木本植物花粉，而草本植物花粉含量较少，这一结果总体上与岸区丘陵低地植被受人为干扰破坏后的表土孢粉组合特征一致。大亚湾和大鹏湾的孢子沉积离岸越近含量越高，湾内的沉积规律与海流和沉积粒度的分布有关。香港海域则在靠伶仃洋一侧孢子含量较高，反映了蕨类孢子以径流搬运为主。此外，木本植物和草本植物花粉总量离岸越远含量越低，松属在木本植物中占优势．其相对含量向外海增加。

DISTRIBUTION CHARACTERISTICS OF POLLEN AND SPORE IN SURFACE SEDIMENTS OF NEARSHORE WATERS BETWEEN HONGKONG AND DAYA BAY

The study of pollen distribution was carried out for the surface sediments in nearshore waters of Hongkong-Dapeng Bay-Daya Bay. The result showed that the pollen assemblages are characterized by high percentage of pteridophyte spores, low content of arboreal pollen, and poor non-arboreal pollen, which is closely related to the littoral vegetation highly disturbed by human activities in these areas. The amount of fern spore is larger in the marine sediments close to the shoreline in Dapeng Bay and Daya Bay, which is related to grain size distribution and water currents within the bay; whereas in Hongkong, the spore content is higher by the side of the Zhujiang River Mouth, suggesting that the spores were mostly transported by the river current. In addition, the further the sample location is away from the seashore, the lower the contents of arboreal pollen and non-arboreal pollen are. Pinus is the most abundant arboreal taxon, the relative content of which gradually increases from the seashore to the deep-sea areas.