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在中国东部连续的尘土孢粉样基础上,用转换函数的方法研究中国东部孢粉与气候的定量关系。研究结果证明,中国东部现代花粉的分布与年均温有密切关系,某些草本植物花粉之间的含量变化很大程度上与太阳辐射量和不同纬度的温度变化有关。因此定量重建古植被带的迁移及古气候的变化就成为可能。通过对比,选择Artemisia与Poaceae的比值作为温度替代指标。Arte/Poac与纬度相关系数的平方值(R~2)为0.9579,它与年均温的相关系数平方值也达到0.9162。用回归方程定量重建了中国东部海域钻孔DGKS-9602的古气候,由于末次盛冰期草本植物花粉丰富,获得的气候值可信度最好,即年均温比现代降低了8℃左右(6—10℃),植被带向南推移了约8—10纬度,这一结果与前人的研究结果基本吻合。
On the basis of the continuous dust sporopollen in eastern China, the quantitative relationship between sporopollen and climate in eastern China was studied by the transfer function method. The results show that the distribution of modern pollen in Eastern China is closely related to the annual average temperature. The content of pollen in some herbaceous plants is largely related to solar radiation and temperature variations at different latitudes. Therefore, it is possible to quantitatively reconstruct the migration of ancient vegetation belt and paleoclimate change. By contrast, the ratio of Artemisia to Poaceae was chosen as a proxy for temperature. The square of the correlation coefficient between Arte / Poac and latitude (R ~ 2) is 0.9579, and the square of the correlation coefficient between Arte / Poac and latitude also reaches 0.9162. The regression equation was used to quantitatively reconstruct the paleoclimate of DGKS-9602 borehole in eastern China. Because of the pollen abundance of herbaceous plants in the last glaciation period, the climate value obtained was the most reliable, that is, the annual average temperature was reduced by about 8 ℃ -10 ℃). The vegetation belt moved southwards by about 8-10 latitudes, which is basically consistent with the previous research results.