【摘要】：珠江三角洲平原具有上千年的圍墾歷史,其土壤發(fā)生演變過(guò)程深受人為作用影響,開(kāi)展此區(qū)域不同種植年限土壤中鐵氧化物形態(tài)特征和分布規(guī)律的研究,能夠揭示人為耕種下土壤發(fā)生演變過(guò)程。以珠江三角洲平原不同種植年限的土壤剖面為對(duì)象,研究了濱海沉積物、河流沖積物和三角洲沉積物發(fā)育的土壤及黏粒中全鐵、游離鐵含量變化及其影響因素。結(jié)果表明:隨著種植年限的增加,河流沖積物、三角洲沉積物發(fā)育土壤中游離鐵(Fe_d)向土體下部淀積深度逐漸增加,黏粒中游離鐵(Fe_(d(clay)))含量在水耕氧化還原層中呈減小趨勢(shì),而濱海沉積物發(fā)育的土壤Fe_d含量及淀積深度均有所減小。隨著種植年限的增加,濱海沉積物發(fā)育的土壤全鐵(Fe_t)和游離鐵(Fe_d)在黏粒中的富集程度呈增大趨勢(shì),而河流沖積物、三角洲沉積物發(fā)育的土壤Fe_t和Fe_d富集程度逐漸減小。土壤Fe_d與Fe_t、黏粒游離鐵(Fe_(d(clay)))與黏粒全鐵(Fe_(t(clay)))均呈極顯著正相關(guān);全鐵富集率(Fe_(t(clay))/Fe_t)、游離鐵富集率(Fe_(d(clay))/Fe_d)均與Fe_(t(clay))、Fe_(d(clay))、黏粒鐵游離度(Fe_(d(clay))/Fe_(t(clay)))呈極顯著正相關(guān),與Fe_t、Fe_d、土壤鐵游離度(Fe_d/Fe_t)、黏粒含量呈極顯著負(fù)相關(guān),且Fe_(t(clay))/Fe_t與Fe_(d(clay))/Fe_d呈極顯著正相關(guān),表明土壤鐵氧化物在黏粒中的富集以Fe_d為主,且鐵氧化物的富集程度受土壤黏粒含量的影響。
[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.
【作者單位】： 華南農(nóng)業(yè)大學(xué)資源環(huán)境學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41271233) 廣東省公益研究與能力建設(shè)項(xiàng)目(2014B020206002) 國(guó)家科技基礎(chǔ)性工作專項(xiàng)重點(diǎn)項(xiàng)目(2008FY110600,2014FY110200)資助~~
【分類號(hào)】：S153

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