OALib Journal期刊
ISSN: 2333-9721
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神农架大九湖四万年以来的植被与气候变化
DOI: 10.11821/xb201301009, PP. 69-81
Keywords: 神农架,大九湖,4,万年,孢粉分析,古植被与古气候
Abstract:
通过对大九湖6m长连续沉积岩芯剖面(DJH-1孔)7个样品的AMS14C年龄测定和151块孢粉样品的鉴定分析,揭示了神农架区域4万以年来植被和气候演变。末次冰期阶段大九湖附近发育森林草地或草地—草甸植被。MIS3晚期,~42-39calkaBP之间,气候相对干冷,发育森林草地;~39-31calkaBP之间,气候较为湿润,草甸扩张并伴随低海拔阔叶树种的发育。MIS2阶段,草甸组分中蒿属显著增加,高海拔可能分布有荒漠草地,气候极端干冷;该时期植被带垂直下降达到1000余m,按垂直温度递减率推算,冰盛期阶段该区域温度下降约7℃左右。从冰消期开始,森林植被开始扩张,北温带、暖温带和亚热带乔木组分依次增加。约在9.4-4calkaBP之间,演变为亚热带常绿阔叶落叶林,属全新世适宜期;从约4calkaBP以来,北温带阔叶和针叶树开始增加,气候趋于凉干。通过对比区域高分辨率的洞穴石笋及高纬冰芯氧同位素记录,表明神农架区域植被环境变化对气候变化敏感,并记录了H1,YD气候突变事件;进一步体现出该区域气候环境演变主要与北半球太阳辐射控制的东亚夏季风强度变化有关,且与北半球高纬气候变化一致。
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