Response of Iron Reduction Characteristics to DOM Molecular Properties under Anaerobic Conditions in Typical Paddy Soils of Hainan Island

doi:10.16258/j.cnki.1674-5906.2021.05.008

Ecology and Environment ›› 2021, Vol. 30 ›› Issue (5): 957-967.DOI: 10.16258/j.cnki.1674-5906.2021.05.008

• Research Articles • Previous Articles Next Articles

Response of Iron Reduction Characteristics to DOM Molecular Properties under Anaerobic Conditions in Typical Paddy Soils of Hainan Island

HUANG Cheng¹(), WU Yueying¹, JI Hengkuan¹, CHEN Liming¹, LI Beiying², FU Chuanliang³, LI Jianhong⁴, WU Weidong¹, WU Zhipeng¹^,^*()

1. College of Tropical Crops, Hainan University, Haikou 570228, China
2. College of Ecology and Environment, Hainan University, Haikou, 570228, China
3. Institute of Agricultural Environment and Soil, Hainan Academy of Agricultural Sciences/Hainan Scientific Observation Station of Cultivated Land Conservation of Ministry of Agriculture and Rural Areas/Key Laboratory of Cultivated Land Conservation in Hainan Province, Haikou 571100, China
4. College of Environmental and Chemical Engineering, Foshan University, Foshan 528011, China

Received:2020-12-07 Online:2021-05-18 Published:2021-08-06
Contact: WU Zhipeng

海南典型水稻土厌氧铁还原特征对DOM分子特性的响应

黄成¹(), 吴月颖¹, 吉恒宽¹, 陈丽铭¹, 李倍莹², 符传良³, 李建宏⁴, 吴蔚东¹, 吴治澎¹^,^*()

1.海南大学热带作物学院,海南海口 570228
2.海南大学生态与环境学院,海南海口 570228
3.海南省农业科学院农业环境与土壤研究所/农业农村部海南耕地保育科学观测实验站/海南省耕地保育重点实验室,海南海口 571100
4.佛山科学技术学院环境与化学工程学院,广东佛山 528011

通讯作者: 吴治澎
作者简介:黄成（1997年生）,男,硕士研究生,研究方向为土壤质量退化与调控研究。E-mail:15155549693@163.com
基金资助:
海南省基础与应用基础研究计划（自然科学领域）高层次人才基金项目(2019RC022);国家自然科学基金项目(41807326)

Abstract

Abstract:

Five types of paddy soils with different parent materials (including basalt, granite, sand shale, marine sediment, and river alluvium) in Hainan Island were collected, aiming to explore the influence mechanisms of the content composition of dissolved organic matter (DOM) on the iron redox characteristics of typical paddy soils. The carbon content and spectral characteristics of DOM in the soils with different parent materials were analyzed using ultraviolet-visible spectroscopy (UV-VIS). The Logistic model was used to characterize the Fe(Ⅲ) reduction characteristics of paddy soils under different incubation processes. The redundancy analysis was used to analyze the effects of DOM components and its spectral parameters on Fe(III) reduction characteristics of the paddy soil within different particle sizes under the anaerobic incubation. The results showed that the Fe(II) concentrations of paddy soils with different parent materials were different during the anaerobic incubation, while the paddy soil with parent material of basalt having the highest Fe(II) concentration (8.45 mg∙g^-1). According to the logistic model, the reduction potential (a) and the Fe(III) reduction rate (v_max) of paddy soils with different parent materials were found to be different and the a and v_max of basaltic paddy soil was the highest. The highest content of dissolved organic carbon (DOC; 0.712 g∙kg^-1) was found in the paddy soil with parent material of marine sediment, and the content of DOC was highest in the smallest particle size (<1 kDa) of all five paddy soils. The content of DOC in all paddy soils decreased with the increasing incubation time. The results of UV-VIS spectroscopy showed that the aromaticity and hydrophobicity of paddy soils with five parent materials decreased with decreasing DOC particle size. The results of three-dimensional fluorescence spectrum showed that the fluorescence intensity of each DOM component in paddy soil with different parent materials increased with the increasing of incubation time, while the fluorescence intensity of each component was enhanced at 0.45?0.7 μm and 1?10 kDa. The fluorescence intensity of each component in decreased at 10 kDa?0.45 μm and<1 kDa; The values of BIX, HIX and FI all increased with the decrease of particle size. The redundancy analysis showed that HIX, SUVA₂₆₀, C1 and C2 components could promote the iron reduction process in paddy soil. The reduction of iron was influenced by different DOM components at different incubation stages, the C1 component, however, always affected the reduction of Fe(III), while the C3 and C4 components with small particle size (<1 kDa) contribute more to the Fe reduction. It is of great significance for agricultural environment to understand the response of rice soil iron reduction to DOM with different molecular weights in Hainan Island.

Key words: paddy soil, dissolved organic matter, particle size distribution, Fe(III) reduction, redundancy analysis, Logistics model

摘要：

为探究海南典型水稻土不同粒径土壤中溶解态有机质（DOM）的含量组成对铁氧化还原特征的影响机制,分别采集海南5种成土母质发育的水稻土（玄武岩、花岗岩、砂页岩、海相沉积物、河流冲积物）,利用紫外-可见光谱技术分析不同粒径土壤中DOM的碳含量及其光谱特征,利用Logistics模型对不同水稻土培养过程中Fe(Ⅲ)还原特征进行表征;采用冗余分析手段分析各水稻土在厌氧培养过程中,不同粒径土壤中DOM组分及光谱参数对Fe(Ⅲ)还原特征影响。结果表明,在厌氧培养过程中,不同母质发育水稻土Fe(Ⅱ)含量不同,其中玄武岩发育水稻土Fe(Ⅱ)含量最大（8.45 mg∙g^-1）,根据Logistics模型发现不同母质发育水稻土的还原潜势（a）和Fe(Ⅲ)还原速率（v_max）存在差异且玄武岩发育水稻土的a、v_max最大。海相沉积物发育水稻土的溶解态有机碳（DOC）含量最高（0.712 g∙kg^-1）,5种水稻土的DOC均在最小粒径（<1 kDa）含量最多,随着培养时间增长各类水稻土中DOC含量均下降,紫外-可见光谱结果显示5种母质发育的水稻土的芳香性和疏水性随着DOC粒径的减小而下降,三维荧光光谱结果表明,不同母质发育水稻土中各组分的荧光强度均随培养时间增长而增强,而在粒径0.45—0.7 µm、1—10 kDa中各组分荧光强度增强;在粒径10 kDa—0.45 µm、<1 kDa中各组分荧光强度降低;BIX、HIX、FI值均随着粒径的减小而增大。冗余分析结果显示,HIX、SUVA₂₆₀、C1、C2组分可促进水稻土铁还原过程,不同的培养阶段下铁还原受不同DOM组分的影响,但是C1组分始终影响Fe(Ⅲ)的还原,小粒径的C3、C4组分（<1 kDa）对铁还原有更大贡献。了解海南岛水稻土铁还原对不同分子量DOM的响应,对农业环境具有重要意义。

关键词: 水稻土, 溶解态有机质, 粒径分布, 铁(Ⅲ)还原, 冗余分析, Logistics模型

CLC Number:

S153
X144

HUANG Cheng, WU Yueying, JI Hengkuan, CHEN Liming, LI Beiying, FU Chuanliang, LI Jianhong, WU Weidong, WU Zhipeng. Response of Iron Reduction Characteristics to DOM Molecular Properties under Anaerobic Conditions in Typical Paddy Soils of Hainan Island[J]. Ecology and Environment, 2021, 30(5): 957-967.

黄成, 吴月颖, 吉恒宽, 陈丽铭, 李倍莹, 符传良, 李建宏, 吴蔚东, 吴治澎. 海南典型水稻土厌氧铁还原特征对DOM分子特性的响应[J]. 生态环境学报, 2021, 30(5): 957-967.

Figures/Tables 13

Table 1 Basic physical and chemical properties of paddy soils developed from five different parent materials

母质 Parent material	有效硅质量分数 ω_{(Effective Si)}/ (mg∙kg^-1)	全硅质量分数 ω_{(Total Si)}/ (mg∙kg^-1)	pH	SOM 质量分数 ω_(SOM)/ (g∙kg^-1)	速效氮质量分数 ω_{(Available N)}/ (mg∙kg^-1)	速效磷质量分数 ω_{(Available P)}/ (mg∙kg^-1)	速效钾质量分数 ω_{(Available K)}/ (mg∙kg^-1)	游离Fe₂O₃ 质量分数 ω_{(Free Fe2O3)}/ (g∙kg^-1)	非晶体氧化铁质量分数 ω_{(Amorphous Fe)}/ (g∙kg^-1)
玄武岩 XW	56.78±3.45a	298.54±23.15c	4.31±0.05d	17.24±1.03b	61.48±2.11d	4.70±0.11d	100.05±8.09a	24.92±1.08a	10.78±0.11a
花岗岩 HG	54.3±4.73a	386.32±16.21a	5.43±0.09c	19.72±1.41b	88.12±6.01a	5.46±0.22c	100.36±8.11a	12.71±0.19bc	7.73±0.30b
砂页岩 SY	53.43±6.48a	302.34±15.15c	5.43±0.08c	17.29±1.98b	75.15±4.61c	6.23±0.28a	81.45±6.08b	14.01±0.41b	7.69±0.14b
海相沉积物HXCJ	54.67±2.51a	356.66±13.90b	7.42±0.01a	24.26±2.21a	80.28±3.11b	5.86±0.12b	64.35±5.06d	9.11±0.89c	5.39±0.13c
河流冲积物HLCJ	53.42±2.49a	342.11±4.85b	6.42±0.03b	22.47±2.51a	91.89±3.51a	5.44±0.15c	73.62±0.46c	9.98±0.99c	5.59±0.21c

Fig. 1 Variations in Fe (Ⅱ) concentrations in submerged paddy soils during anaerobic incubationn=3. The same below

Table 2 The Logistic kinetics parameters of microbial Fe (Ⅲ) reduction during anaerobic incubation of paddy soils

Logistic 方程参数 Logistic model parameters
母质 Parent material	a/ (mg∙g^-1)	v_max/ [mg∙(g∙d)^-1]	t_v_max/ d	r²
玄武岩 XW	7.93±0.12	1.28±0.15	1.02±0.09	0.975
花岗岩 HG	7.50±0.09	0.68±0.06	5.25±0.38	0.956
砂页岩 SY	6.33±0.04	0.99±0.12	2.97±0.23	0.922
海相沉积物 HXCJ	3.91±0.15	0.47±0.00	4.46±0.09	0.943
河流冲积物 HLCJ	4.55±0.02	0.86±0.05	2.24±0.13	0.966

Fig. 2 DOC content of paddy soils with different parent materials at different culture stages

Fig. 3 Grain size distribution characteristics of paddy soils with different parent materials

Fig. 4 Grain size distribution characteristics of DOC content percentage of paddy soils developed from different parent materials

Fig. 5 SUVA254 (a) and SUVA260 (b) values of DOM in paddy soils with different parent materials

Fig. 6 SUVA254 (a) and SUVA260 (b) values for each DOM particle size in paddy soils with different parent materials

Fig. 7 Distribution of fluorescence components in DOM of paddy soils with different parent materials

Fig. 8 Percentage distribution of DOM fluorescence components in paddy soils with different grain sizes under different parent soils

Fig. 9 Fluorescence intensities of 4 components in DOM of various developed paddy soils

Fig. 10 BIX (a), FI (b), and HIX (c) values for each grain size of DOM of paddy soils with different soil-forming materials

Fig. 11 RDA diagrams of soil environmental factors and Fe (III) reduction characteristics of developing parent materials at different stagesInitial-a, PⅠ-b, PⅡ-c, PⅢ-d

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Response of Iron Reduction Characteristics to DOM Molecular Properties under Anaerobic Conditions in Typical Paddy Soils of Hainan Island

海南典型水稻土厌氧铁还原特征对DOM分子特性的响应

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