神农架花粉-气候转换函数的建立与初步应用

The construction and application of Pollen-climate transfer function in Shennongjia Mountain Region

根据大量孢粉分析与气候观测资料,运用统计方法建立了神农架地区现代花粉-气候转换函数;并以大九湖为例,运用所建回归方程计算出了晚第四纪12 500年以来的气候参量值.结果表明,更新世末(10 600～12 500 a.B.P)为寒冷干燥的冰期气候,年均温比今低8℃,年降水量比今低150～200 mm; 7 400～10 600 a.B.P为一气候过渡期,年均温比今高3.5℃左右,年降水量最高时比今约高300 mm; 4000 a.B.P以来,气候有所波动,基本以温和湿润为特征.

On the basis of soil sporopollen assemblages and so me climate indexes, a transfer function of pollenclimate in shennongjia mountains is established by mcans of a statistical method. Based on the function, pale oclimate of late Quatereary is analyzed in Dajiuhu lake area. The end of Pleistocene (10 600～12 500 a.B.P) is still in ice age and the climate is cold and dry. Annual mean Temperature (AMT) and annual mean precipitation (AMP) at that time are about 8℃ and 150～200 mm, lower than that at present. Early Holocene (7 400～10 600 a.B.P) is a climate transit stage, mwhich both AMT and AMP increase quickly. Middle Holocene (4 000～7 400 a.B.P) is the warmest and humidest in late Quarternary and AMT and AMT are about 3.5℃ and 300 mm higher than that at pres ent respectively. Late Holocene (4 000 a.B.P) is warm and wet and AMT and AMP fluctuate at a small scale.