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稻田改为茶园后土壤铁形态与磁学性质演变特征
翁 倩, 袁大刚, 余星兴, 蒙凤丹, 母 媛, 王昌全
四川农业大学资源学院
摘要:
以四川省雅安市名山区稻田及由稻田改造的茶园土壤为研究对象,采用铁形态连续分级提取与环境磁学技术相结合的方法,分析铁氧化物与磁学特征随土壤利用方式及植茶时间变化而变化的特征。结果表明:稻田及不同植茶年限(3、6、10 a)茶园土壤110 cm土体各形态铁含量均表现为可还原铁(Red-Fe)>可氧化态铁(Oxi-Fe)>酸溶态铁(Acid-Fe);稻田改为茶园以及随着植茶年限延长,表层(0 ~ 10 cm)及亚表层(10 ~ 20 cm)土壤Acid-Fe、Oxi-Fe含量明显增加,而整个土体Red-Fe含量降低。稻田改为茶园3 a后,0 ~ 30 cm土壤表现出质量磁化率(MS)、饱和等温剩磁(SIRM)、软剩磁(IRMs)升高,而硬剩磁(IRMh)降低;随着植茶年限的延长,土体总体表现出各磁性参数均降低的趋势,亚铁磁性矿物主导土壤磁性特征变化。稻田改为茶园后土壤逐渐酸化且有机质积累,使亚铁磁性矿物不稳定,进一步导致Red-Fe溶解并向Acid-Fe、Oxi-Fe转化,且随植茶年限的延长,部分铁氧化物结晶度会增加。
关键词:  稻田  茶园  铁形态  磁学特征  连续提取
DOI:10.13758/j.cnki.tr.2020.05.028
分类号:S153
基金项目:国家自然科学基金项目(41372130)和国家科技基础性工作专项项目(2014FY110200A12)资助。
Evolution of Iron Morphology and Magnetism in Soil Converted from Paddy Field to Tea Garden
WENG Qian, YUAN Dagang, YU Xingxing, MENG Fengdan, MU Yuan, WANG Changquan
College of Resource Science and Technology,Sichuan Agricultural University
Abstract:
Taking the paddy field converted to tea garden in Mingshan District of Yaan City in Sichuan Province as the study objects, and the continuous extraction and environmental magnetic techniques were used to analyze the changes of iron (Fe) forms and magnetic parameters with tea-planting year. The results showed that all soil pedons (0–110 cm) were in order of reducible iron (Red-Fe) > oxidizable iron (Oxi-Fe) > acid-soluble iron (Acid-Fe). Acid-Fe and Oxi-Fe in 0–10 cm and 10–20 cm layers increased significantly when paddy field converted to tea garden and with tea-planting year, while Red-Fe decreased in all soil pedons. Three years after paddy field converted to tea garden, soil magnetic susceptibility (MS), saturated isothermal remanence (SIRM) and soft remanence (IRMs) increased but hard remanence (IRMh) decreased. However, with the increase of tea-planting years, all soil magnetic parameters decreased, and ferromagnetic minerals dominated the change of soil magnetic characteristics. After paddy field was converted to tea garden, soil was gradually acidified and organic matter was accumulated, which made ferromagnetic minerals unstable, and further led to the transformation of Red-Fe into acid-Fe and Oxi-Fe, while the crystallinity of some iron oxides increased with the increase tea-planting year.
Key words:  Paddy field  Tea garden  Iron species  Magnetic characteristics  Continuous extraction

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