湿润亚热带山地土壤磁学特征对气候响应的敏感程度

he formation, transformation, migration and preservation of soil magnetic minerals are closely related to climatic conditions. The response form, sensitivity and mechanism of soil magnetic minerals to climate are the basic research content of soil environmental magnetism. In this study, we selected three soil profiles at different altitudes in the subtropical mountains as the research objects. The locations of these three profiles are close in space, and there is basically no difference in parent material, topography and vegetation types. The difference in pedogenesis factors is mainly reflected in the different climatic conditions caused by the difference in altitude. We measured environmental magnetism, chromaticity, and major elements on the three profiles in order to explore the response and sensitivity of soil magnetic characteristics to climate. The results show that: 1. With the development of soil, the content of superparamagnetic (SP) and single domain (SD) fine-grained ferrimagnetic minerals in the soil increases, and the content of secondary antiferromagnetic minerals also increases. The increase rate of ferrimagnetic minerals is higher than that of antiferromagnetic minerals. The magnetic properties of the soil increase with the increase in the intensity of pedogenesis. 2. Climatic conditions are the dominant factors for the regular changes of magnetic characteristics of the three research profiles with altitude. Climate affects magnetic minerals in soil through weathering / pedogenesis. 3. Precipitation is not the limiting factor of magnetic enhancement in humid subtropical mountain soils. Air temperature regulates the generation, transformation and preservation of soil magnetic minerals by controlling the chemical reaction rate and evaporation, which is the dominant factor for the magnetic difference of soil in mountainous vertical zonality. The magnetic minerals in subtropical mountainous soil can respond very sensitively to the slight change of temperature.