珠江三角洲平原不同种植年限土壤铁氧化物特征研究

发布时间：2018-09-05 12:20

【摘要】：珠江三角洲平原具有上千年的围垦历史,其土壤发生演变过程深受人为作用影响,开展此区域不同种植年限土壤中铁氧化物形态特征和分布规律的研究,能够揭示人为耕种下土壤发生演变过程。以珠江三角洲平原不同种植年限的土壤剖面为对象,研究了滨海沉积物、河流冲积物和三角洲沉积物发育的土壤及黏粒中全铁、游离铁含量变化及其影响因素。结果表明:随着种植年限的增加,河流冲积物、三角洲沉积物发育土壤中游离铁(Fe_d)向土体下部淀积深度逐渐增加,黏粒中游离铁(Fe_(d(clay)))含量在水耕氧化还原层中呈减小趋势,而滨海沉积物发育的土壤Fe_d含量及淀积深度均有所减小。随着种植年限的增加,滨海沉积物发育的土壤全铁(Fe_t)和游离铁(Fe_d)在黏粒中的富集程度呈增大趋势,而河流冲积物、三角洲沉积物发育的土壤Fe_t和Fe_d富集程度逐渐减小。土壤Fe_d与Fe_t、黏粒游离铁(Fe_(d(clay)))与黏粒全铁(Fe_(t(clay)))均呈极显著正相关;全铁富集率(Fe_(t(clay))/Fe_t)、游离铁富集率(Fe_(d(clay))/Fe_d)均与Fe_(t(clay))、Fe_(d(clay))、黏粒铁游离度(Fe_(d(clay))/Fe_(t(clay)))呈极显著正相关,与Fe_t、Fe_d、土壤铁游离度(Fe_d/Fe_t)、黏粒含量呈极显著负相关,且Fe_(t(clay))/Fe_t与Fe_(d(clay))/Fe_d呈极显著正相关,表明土壤铁氧化物在黏粒中的富集以Fe_d为主,且铁氧化物的富集程度受土壤黏粒含量的影响。
[Abstract]:The Plain of Pearl River Delta has a history of reclamation for thousands of years, and its soil evolution process is deeply influenced by artificial action. The morphological characteristics and distribution of iron oxides in soils of different planting years in this region are studied. It can reveal the evolution of soil under artificial cultivation. Based on the soil profiles of different planting years in the Pearl River Delta Plain, the changes of total iron and free iron contents in coastal sediments, river alluvium and delta sediments and their influencing factors were studied. The results showed that the depth of free iron (Fe_d) in deltaic sediments increased gradually with the increase of planting years, and the content of free iron (Fe_ (d (clay) in clay decreased in redox layer of hydrotillage. However, the Fe_d content and deposition depth of littoral sediments decreased. With the increase of planting years, the enrichment degree of total iron (Fe_t) and free iron (Fe_d) in the soils developed by coastal sediments increased, while the enrichment degree of Fe_t and Fe_d in fluvial sediments and deltaic sediments decreased gradually. There was a significant positive correlation between Fe_d and Fe_t, free iron (Fe_ (d (clay) and total iron (Fe_ (t (clay), and there was a significant positive correlation between Fe_ (t (clay) / Fetit and Fe_ (d (clay) / Fed with Fe_ (d (clay) / Fe _ (t (clay) (Fe_ (d (clay) / Fe _ (t (clay). There was a significant negative correlation between the content of clay and Fe_d/Fe_t of Fe_t,Fe_d, soil, and a significant positive correlation between Fe_ (t (clay) / Fetit and Fe_ (d (clay) / Fed, indicating that the enrichment of soil iron oxide in clay was dominated by Fe_d, and the enrichment degree of iron oxide was affected by the content of soil clay.
【作者单位】：华南农业大学资源环境学院;
【基金】：国家自然科学基金项目(41271233) 广东省公益研究与能力建设项目(2014B020206002) 国家科技基础性工作专项重点项目(2008FY110600,2014FY110200)资助~~
【分类号】：S153

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