egetation evolution in the northern South China Sea region since 40 500 a BP is reconstructed using biomization procedure based on pollen data from deep sea core 17940. The result shows that, it is feasible to reconstruct palaeovegetation using biomization procedure, when pollen, particularly Pinus pollen, transported by wind over long distance is excluded. Results from factor analysis suggest that humidity and temperature are the two main factors determining vegetation evolution on land around the northern South China Sea. From 40 500 a BP to 11 100 a BP, broad-leaved evergreen forest (WAMF), and montane conifers(MGRF) occurred on hills and low mountains; while steppe (STEP) predominated on the exposed shelf. The main feature of the vegetation evolution is the frequent alternation between MGRF (or WAMF) and STEP, implying abrupt changes in millennium scale between humid/cold and dry/temperate climate. All abrupt climate events could be broadly correlated with Henrich events and Dansggard-Oscherge events. One of the events around 12 700 a BP, sees the occurrence of MGRF, suggesting that climate turned humid and cold rapidly. This may be correlated with the Younger Dryas event; Broad-leaved evergreen (WAMF) predominates since 11 000 a BP. During the early Holocene and late Holocene tropical rainforest (TRFO) or tropical seasonal forest (TSFO ) occurred several times.
四万年来南海北部周边地区植被演替序列——孢粉生物群区化方法恢复古植被的尝试
罗运利 孙湘君
（中国科学院植物研究所，北京100093）
摘要：就南海北部海域17940孔的孢粉资料,利用孢粉生物群区化方法和因子分析方法,对南海北部周边地区4万年以来的植被演替序列进行研究,结果表明:对于深海沉积物,在排除远距离搬运的花粉尤其是松属(Pinus L.)花粉的噪音后,可以利用孢粉生物群区化方法恢复周边大陆古植被演替序列.因子分析表明,湿度和温度的变化是影响南海北部周边大陆植被演化的主要因子.在40 500～11 100 a BP南海北部沿海大陆地区的古植被,主要为常绿阔叶林(WAMF) ,山地针叶林(MRGF)分布于低山、丘陵;而广泛出露的大陆架上则发育了以蒿属(Artemisia L.)为主的草原(STEP) 景观:末次冰期时环境变化的突出特征山地针叶林(MRGF)、常绿阔叶林(WAMF)与草原(STEP) 之间的频繁交替,反映了气候冷湿和温干的千年级尺度的迅速变化,可以与Heinrich事件以及Dansggard-Oscherge事件进行对比.其中在7.0 m处(12 700 a BP)所恢复的山地针叶林( MRGF)景观反映了一次气候变冷变湿的事件,可能与新仙女木事件相对应.全新世早期和末期较多出现热带雨林(TRFO)以及热带季雨林(TSFO)景观,而全新世中期以常绿阔叶林(WAMF) 为主,缺乏热带雨林(TRFO)以及热带季雨林(TSFO)景观,可能表明在全新世中期尽管温度升高,但湿度有可能降低.
关键词： 花粉；生物群区化；因子分析；中国南海；古植被
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