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依据位于燕山南部迁安盆地蚕姑庙村和余家洼村具放射性碳年代测定支持的埋藏泥炭剖面的孢粉分析资料 ,揭示了迁安盆地 5 0 0 0aBP以来自然植被变化和人类活动对自然环境的影响。在 4 6 0 0～ 310 0aBP期间 ,迁安盆地曾经生长着以栎为主的落叶阔叶林 ,至 310 0aBP以后 ,森林中阔叶树成分显著下降 ,喜凉耐干的松树比例增加 ,16 0 0aBP后 ,迁安盆地人类农耕活动进一步加剧 ,森林遭受到大规模的破坏。孢粉分析资料揭示迁安盆地人类栽培板栗的历史可以追溯到 16 0 0aBP左右 ,种植水稻的历史可以追溯到 70 0aBP左右。
Based on the sporopollen analysis data of burial peat profiles supported by radioactive carbon dating in Qianguamu Village and Yujiawa Village in Qian’an Basin in southern Qianshan Mountains of Yanshan, natural vegetation change and human activities in Qian’an Basin since 500aBP are revealed. Environmental impact. During the period of 4-600 ~ 310 0aBP, deciduous broad-leaved forests dominated by oaks have been observed in Qian’an basin. After 310 oa BP, the deciduous broad-leaved trees in the forest decreased significantly, and the proportion of hi-tolerant pine trees increased by 16 0 0 a BP Afterwards, the human activities in Qian’an Basin further aggravated and the forests suffered massive destruction. Sporopollen analysis revealed that the history of cultivated chestnut in Qian’an Basin dates back to about 160bp, and the history of planting rice can be traced back to about 70 0bp.