| 珠江三角洲平原不同种植年限土壤铁氧化物特征研究 |
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| 引用本文： | 贾重建,卢 瑛,熊 凡,崔启超,刘红宜,秦海龙,姜 坤,高玉洁.珠江三角洲平原不同种植年限土壤铁氧化物特征研究[J].土壤学报,2017,54(4):894-904. |
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| 作者姓名： | 贾重建 卢 瑛 熊 凡 崔启超 刘红宜 秦海龙 姜 坤 高玉洁 |
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| 作者单位： | 华南农业大学资源环境学院,广州,510642 |
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| 基金项目： | 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）和国家科技基础性工作专项重点项目（2008FY110600, 2014FY110200）资助 |
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| 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。
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| 关 键 词： | 铁氧化物 淋溶淀积 种植年限 成土母质 珠江三角洲 |
| 收稿时间： | 2016/10/18 0:00:00 |
| 修稿时间： | 2017/1/14 0:00:00 |
Characteristics of Iron Oxide in Soils Different in Cultivation Age in the Pearl River Delta Plain |
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| JIA Chongjian,LU Ying,XIONG Fan,CUI Qichao,LIU Hongyi,QIN Hailong,JIANG Kun and GAO Yujie.Characteristics of Iron Oxide in Soils Different in Cultivation Age in the Pearl River Delta Plain[J].Acta Pedologica Sinica,2017,54(4):894-904. |
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| Authors: | JIA Chongjian LU Ying XIONG Fan CUI Qichao LIU Hongyi QIN Hailong JIANG Kun and GAO Yujie |
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| Affiliation: | College of Natural Resources and Environment,South China Agricultural University |
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| Abstract: | Objective] The Pearl River Delta Plain,located in South China,has a more-than-one-thousand-year cultivation history,so that the soil therein has been subjected to impacts of intensive anthropogenic activities in its evolution.The knowledge of how the soil evolves under anthropogenic activities is sure helpful to sustainable utilization and management of the soil resources.Being highly active and geochemically sensitive,iron oxides in soil tend to be affected by any slight change in environmental condition in formation and property,so they are often used as an indicator of soil pedogenic process,and considered as a function of soil genesis and development.Therefore,characterization of soil iron oxides has been one of the major fields of the study on soil genesis.In this study an investigation was performed of characteristics of iron oxides in bulk soil and soil clay relative to cultivation age and affecting factors in the Pearl River Delta Plain,in an attempt to reveal how the soil forms and evolves under anthropogenic cultivation in the region.Method] Samples were collected from genetic horizons of the soils derived from marine deposits with cultivation age being 30 a,100 a,600 a and 1 000 a,separately,of the soils derived from fluvial deposits with cultivation age being 200 a,400 a,900 a and 1 000 a separately and of the soils derived from delta deposits with cultivation age being 50 a,90 a,150 a and 350 a,separately,in the Pearl River Delta Plain for analysis of physicochemical properties,and total iron (Fe,),free iron (DCB-extractable iron,Fed),ratio of Fed to Fet (Fed / Fe,) in bulk soil and clay (Fed (clay)/Fet (clay)),Fed sedimentation coefficient (ratio of Fed in the genetic horizon beneath the surface horizon to Fed in surface horizon) and enrichment rates of Fet and Fed in clay (Fet(clay)/Fet and Fed(clay)/Fed).Result] Results show that:(1) Among the soils derived from marine deposits,those,30 a in cultivation age,were all ＞ 1 in Fed sedimentation coefficient,regardless of horizon;those,100 a and 600 a in cultivation age,were ＞ 1 only in some genetic horizons,and those,1 000 a in cultivation age,were all ＜ 1.In the soils derived from fluvial deposits,the generic horizon where Fed sedimentation occurred went deeper with the cultivation age.Among the soils derived from delta deposits,those,50 a,90 a,150 a and 350 a in cultivation age,were found to have genetic horizons as deep as 40-cm,45-cm,80-cm and 90-cm,respectively.(2) In the soils derived from marine deposits,the distribution of Fed in clay (Fed (clay)) in soil profile varied irregularly with cultivation age,while in the soils derived from fluvial and delta deposits the content of Fed (clay) in soil layers below 40-cm and 60-cm depth,respectively,declined with cultivation age.(3) The contents of Fe,and Fed in clay were higher than their corresponding ones in bulk soil,Among the soils derived from marine deposits,those,30 a and 100 a in cultivation age were lower than those,600 a and 1000 a in cultivation age,in Fe,and Fed enrichment rate.In the soils derived from fluvial deposits Fet and Fed enrichment rates increased with cultivation age in the soil layers below 40-cm.And among the soils derived from delta deposits,those,350 a in cultivation age,were lower than those younger in cultivation age in Fet and Fed enrichment rate.And (4) Fed and Fet in bulk soil was extra-significantly and positively related to Fed and Fet in clay,and so was Fe,(clay)/Fe,and Fed (clay)/Fed to Fe,(clay) Fed (clay) and Fed (clay)/Fe,(clay),and Fe,(clay)/Fet to to Fed (clay)/Fed,however Fet (clay)/Fe,and Fed(clay)/Fed was extra-significantly and negatively related to Fe,,Fed,Fed/ Fe,and clay content.Conclusion] With agricultural cultivation going on,Fed in the soils derived from fluvial and delta deposits tends to leach down and deposit in the lower and lower soil layers;Fed content tends to decline in the hydroponic redox layer of the soils derived from marine deposits;iron oxides tend to increase in enrichment rate in clay of the soils derived from marine deposits,but decline in clay of the soils derived from fluvial and delta deposits.However,the iron oxides accumulating in clay of the soils were dominated with Fed,and clay content in the soils is the major factor affecting iron oxide enrichment rate. |
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| Keywords: | Iron oxides Eluviation-illuviation Cultivation age Soil-forming parent material Pearl River Delta |
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