首页 > 过刊浏览>2023年第42卷第2期 >167-176. DOI:10.13300/j.cnki.hnlkxb.2023.02.021
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黄棕壤土柱中铁和锰的淋溶淀积特征
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作者:
作者单位:

华中农业大学农业农村部长江中下游耕地保育重点实验室，武汉 430070

通讯作者:

黄丽，E-mail：daisyh@mail.hzau.edu.cn

中图分类号:

X53

基金项目:

国家自然科学基金项目（41977020；40971143）王辉程，E-mail：874789070@qq.com


Leaching and deposition characteristics of iron and manganese in yellow brown soil column
Author:
Affiliation:

Ministry of Agriculture and Rural Affairs Key Laboratory of Arable Land Conservation in the Middle and Lower Reaches of the Yangtze River， Huazhong Agricultural University，Wuhan 430070，China

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    摘要:

    为了研究干湿交替下土壤中铁和锰的淋溶淀积特征，以亚热带的黄棕壤为土柱材料，用pH 3.5的0~0.08 mol/L的FeSO4和MnCl2单一或混合溶液（浓度比分别为4︰1、2︰1和1︰1）淋溶土柱40次（每次间隔7 d），分析淋出液的pH和铁锰含量、土壤中铁锰含量和钙镁含量的变化。结果显示，随着淋溶次数增加，铁锰淋溶处理的土柱淋出液的pH总体降低1.10~2.68，甚至低于淋溶液的pH值；淋出液中的铁含量要低于淋溶液中的，而淋溶7次之后淋出液中的锰含量则相反；淋溶第一阶段（20次）和第二阶段（40次）土壤中铁和锰的全量、铁的游离态和非晶质态的含量有所增加，铁锰浓度高的淋溶液淋溶后土壤中铁锰氧化物含量升高，游离铁含量最高为89.14 mg/g，游离锰含量最高为13.35 mg/g；干湿交替淋溶下铁氧化物比锰氧化物更易形成，铁氧化物含量在上层（5 cm）土壤中较高，锰氧化物含量在下层（25 cm）土壤中较高；淋溶后土壤中钙、镁含量分别降低0.45~4.89、8.68~14.45 g/kg。

    Abstract:

    The subtropical yellow brown soil column was leached with 0-0.08 mol/L of pH 3.5 (molar concentration ratio of 4︰1, 2︰1 and 1︰1) FeSO4 and MnCl2 single or mixed solution for 40 times (7 days interval each time） to study the leaching and deposition characteristics of iron and manganese in soil under alternating dry and wet conditions. The content changes of pH, Fe and Mn of the leached solution, the content of Fe, Mn, Ca and Mg in the soil were analyzed. The results showed that the pH of leachate from soil column treated with Fe and Mn decreased by 1.10-2.68 with the increase of leaching times, even lower than that of leaching solution. The content of iron in the leachate was lower than that in the leaching solution, while the content of manganese in the leachate was opposite after 7 times of leaching. The total amount of Fe and Mn, the content of free and amorphous iron oxides in the soil increased at the first stage (20 times) and the second stage (40 times) of leaching. The content of iron and manganese oxides in the soil increased after leaching with high concentration of iron and manganese solution. The highest content of free iron and manganese oxide was 89.14 mg/g and 13.35 mg/g, respectively. Iron oxides were easier to form than manganese oxides under the alternate wetting and drying leaching conditions. The contents of iron oxides and manganese oxides were higher in the upper layer (5 cm) and the lower layer (25 cm), respectively. The content of Ca and Mg in soil after being leached decreased by 0.45-4.89 g/kg and 8.68-14.45 g/kg, respectively.

    表 1 淋溶试验中铁和锰的浓度Table 1 The concentration of Fe-Mn liquor in the leaching test
    表 2 淋溶黄棕壤中各种形态铁的含量Table 2 Content of various forms of iron oxide in leaching yellow brown soil
    图1 黄棕壤土柱淋出液的pH变化Fig.1 pH in leaching liquor of yellow brown columns
    图2 黄棕壤土柱不同阶段淋出液中铁含量Fig.2 The content of Fe in leachate of yellow brown soil column at different stages
    图3 黄棕壤土柱不同阶段淋出液中锰含量Fig.3 The content of Mn in leachate of yellow brown soil column at different stages
    图4 2个阶段黄棕壤中不同形态铁、锰氧化物的相关性Fig.4 Correlation between different forms of iron and manganese oxides in yellow brown soil at two stages
    表 4 不同阶段淋溶黄棕壤中钙、镁的含量Table 4 Content of Ca and Mg in leaching yellow brown soil at different stages
    表 3 淋溶黄棕壤中各种形态锰的含量Table 3 The content of various forms of manganese oxide in leaching yellow brown soil
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王辉程,顾沛,黄丽.黄棕壤土柱中铁和锰的淋溶淀积特征[J].华中农业大学学报,2023,42(2):167-176

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  • 收稿日期:2022-06-15
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