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黄土高原表土磁化率与降水量呈良好的正相关性,为定量反演这一区域第四纪时期降水量变化提供了理论基础。通过对西北戈壁沙漠-黄土高原表土磁化率研究,表明表土磁化率与降水量的相关性出现在一定的降水范围内。其界限是年平均降水量200~300mm:高于这一界限,表土的磁化率、频率磁化率、百分比频率磁化率与降水量、相对湿度均呈现良好的正相关关系;低于这一界限,磁学参数与气候之间的相关性明显减弱,或者变得不明显。这是因为在该气候条件下,1)风化弱,成土组分贡献小,同时2)风积磁颗粒粒径粗,对磁化率影响较大的缘故。
The correlation between surface magnetic susceptibility and precipitation in the Loess Plateau shows a good positive correlation, which provides a theoretical basis for the quantitative inversion of precipitation in the Quaternary period in this area. Through the study on the magnetic susceptibility of the surface soil in the Gobi Desert - Loess Plateau in Northwest China, it shows that the correlation between the susceptibility of surface soil and precipitation is within a certain range of precipitation. The limit is the average annual rainfall of 200 ~ 300mm: above this limit, topsoil magnetic susceptibility, frequency susceptibility, percentage frequency susceptibility and precipitation, relative humidity showed a good positive correlation; Below this limit, The correlation between magnetic parameters and climate is significantly diminished or becomes less pronounced. This is because under the climatic conditions, 1) weak weathering and small contribution of soil components, meanwhile 2) the size of aeolian magnetic particles is coarse, which has a great influence on the magnetic susceptibility.