湿润亚热带山地土壤磁学特征对气候条件变化响应的敏感程度  

SENSITIVITY OF SOIL MAGNETIC CHARACTERISTICS RESPONSE TO CLIMATIC CONDITION CHANGES IN HUMID SUBTROPICAL MOUNTAINOUS AREAS

作　　者：杜佳昊 吕镔[1,2] 林荣达 刘鑫 唐金梦 DU Jiahao;LÜ Bin;LIN Rongda;LIU Xin;TANG Jinmeng(Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education,Fujian Normal University,Fuzhou 350007,Fujian;Institute of Geography,Fujian Normal University,Fuzhou 350007,Fujian)

机构地区：[1]福建师范大学湿润亚热带生态-地理过程教育部重点实验室,福建福州350007 [2]福建师范大学地理研究所,福建福州350007

出　　处：《第四纪研究》2022年第6期1601-1612,共12页Quaternary Sciences

基　　金：国家自然科学基金项目(批准号:41877435)资助。

摘　　要：土壤磁性矿物的形成、转化、运移和保存与气候条件密切相关,其对气候的响应形式、敏感程度及机制是土壤环境磁学的基础研究内容。本研究选取亚热带山地不同海拔高度,但位置相近,母质、地形和植被类型上基本无差异的3个剖面为对象,进行环境磁学、色度、常量元素等参数的测量,探究土壤磁学特征对气候的响应及其敏感程度。结果表明:1)随着土壤发育,土壤中超顺磁(SP)、单畴(SD)细粒亚铁磁性矿物增加,次生反铁磁性矿物的含量也不断增加,亚铁磁性矿物增加的速率高于反铁磁性矿物。土壤磁性随着成壤强度的增加而增强。2)气候通过风化/成壤作用进而影响土壤中磁性矿物,是3个研究剖面磁学特征随海拔规律性变化的主导因素。3)降水量不是湿润亚热带山地土壤磁性增强的限制因子。气温通过化学反应速率和蒸发量调节土壤磁性矿物的生成、转化与保存,是山地垂直地带性土壤磁性差异的主导因素。亚热带山地土壤磁性矿物可以非常敏感地响应气温的微小变化。The 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 three profiles are all located in Sanloucun Village, Nanping City, Fujian Province. They are named after Sanloucun Village and altitude. The SLC-559 profile(26° 48′26.0″N, 118° 07′57.9″E), with an altitude of 559 m a.s.l.;The SLC-623 profile(26° 48′19.9″N, 118° 08′05.7″E), with an altitude of 623 m a.s.l.;The SLC-667 profile(26° 48′23.3″N, 118° 08′23.8″E), with an altitude of 667 m a.s.l. The thickness of SLC-559, SLC-623 and SLC-667 profiles are 1.6 m, 1.2 m and 1.3 m, respectively, and 43 soil samples were collected at 10 cm intervals from 3 profiles. In addition, 5 parent rock samples were collected from R horizon(bed rock horizon). 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 weather

关 键 词：亚热带地区 山地土壤 环境磁学 磁性矿物 气候 

分 类 号：P318[天文地球—固体地球物理学]