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松是山东山丘地区的原生树种,可从孢粉分析中得到证明。据《青岛胶州湾地区二万年以来的古植被与古气候》一文分析,距今20000—13000年间,在黄海岸边的山地丘陵上有小片松林分布;距今8500—5000年间,气候温暖湿润,植被是以阔叶树为主的针阔叶森林,这时是山东森林的全盛时代,《孟子》形容当时“草木畅茂,禽兽繁殖”。距今5000—2500年,原始森林开始遭到破坏,气候温和略干,森林植被开始变成以针叶树为主的针阔叶森林,松属花粉占木本花粉的85%。另外,从辽宁南部全新世沉积物的孢粉分析中,
Pine is a native tree species in the hills of Shandong Province, which can be proved from the analysis of sporopollen. According to “Qingdao Jiaozhou Bay area since 20,000 years of ancient vegetation and paleoclimate,” an article analysis, dating back 20000 - 13000 years ago, in the Yellow Sea coast hills and hills there is a small piece of pine forest distribution; dating back 8500-5000 years, warm and humid climate The vegetation is coniferous and broad-leaved forest dominated by broad-leaved trees. At this time, it was the heyday of the forest in Shandong Province. Mencius described as “vegetation and animal breeding at the time.” From 5000 to 2500 years ago, the virgin forest began to be destroyed, and the climate was slightly dry. The forest vegetation began to become coniferous and broad-leaved forest dominated by coniferous pollen accounting for 85% of the woody pollen. In addition, from the spore-pollen analysis of Holocene sediments in southern Liaoning,