有机肥通过与土壤矿物质的相互作用加剧了稻田DOM的垂直异质性

IF 6.1 1区 农林科学 Q1 SOIL SCIENCE
Yi Xiao , Rong Huang , Weiliang Xiong , Binbin Liu , Qinghua Zhou , Tao Jiang , Vanessa N.L. Wong , Jiang Liu , Yingjie Wu , Youlin Luo , Qiquan Li , Qiang Xu , Ting Lan , Changquan Wang , Bing Li
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引用次数: 0

摘要

溶解有机质(DOM)是土壤中一种复杂的可溶性有机化合物,与碳周转、养分循环和气候变化有关。然而,施用无机和有机肥后,土壤Fe和Mn氧化物对水稻土DOM特性的潜在影响存在不确定性。研究了无机和有机肥处理水稻土(0 ~ 40 cm) DOM的特征,以及DOM与Fe、Mn氧化物的关系。采用紫外可见光谱(UVVis)和荧光激发发射矩阵(EEM)分光光度法对水稻土进行了4种施肥处理,分别为不施肥对照(CK)、只施肥无机肥(NPK)、50% %化学氮取代有机肥(NPKM)和100% %化学氮取代有机肥(M)。CK、NPK和NPKM处理下表层土壤(0 ~ 20 cm)和地下土壤(20 ~ 40 cm) DOM含量差异不显著。而在M处理下,DOM含量随土层深度的增加而显著增加。随着土壤深度的增加,施用有机肥导致DOM的芳香性和疏水性组分以及腐殖质和蛋白质样组分的荧光强度显著降低;随着土层深度的增加,易还原性铁含量显著增加,总锰和可还原性锰含量显著降低。有机肥的添加增加了水稻土剖面DOM特征的垂直变化。DOM与剖面中Fe、Mn氧化物含量的一致性和相关性分析表明,Fe、Mn氧化物可能是DOM垂直非均质性的主要影响因素,其机制是随着土壤深度的增加,矿物保护作用减弱,矿物异位还原程度增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Organic fertilizer intensifies the vertical heterogeneity of DOM in paddy fields through interactions with soil minerals
Dissolved organic matter (DOM) is a complicated soluble organic composite in soils that is known to be linked to carbon turnover, nutrient cycling, and climate change. However, uncertainties exist about the potential influence of soil Fe and Mn oxides on DOM characteristics in paddy soil profiles following the application of inorganic and organic fertilizers. We investigated the DOM characteristics in a paddy soil profile (0–40 cm) treated with inorganic and organic fertilizers and the relationships between DOM and Fe and Mn oxides. The paddy soils were subjected to four fertilizer treatments: a control with no fertilizer (CK), inorganic fertilizer only (NPK), 50 % chemical N substituted with organic fertilizer (NPKM), and 100 % chemical N substituted with organic fertilizer (M). Ultravioletvisible (UVVis) spectroscopy and fluorescence excitation-emission matrix (EEM) spectrophotometry were integrated to explore the vertical variation in the DOM. There were no significant differences in the DOM content between the surface soil (0–20 cm) and the subsurface soil (20–40 cm) under the CK, NPK, and NPKM treatments. However, the DOM content significantly increased with soil depth under the M treatment. The application of organic fertilizer resulted in a significant reduction in the aromaticity and hydrophobic components of the DOM, as well as the fluorescence intensity of the humic-like and protein-like components with increasing soil depth; the content of easily reducible Fe significantly increased, whereas the total Mn and reducible Mn contents significantly decreased with increasing soil depth. The addition of organic fertilizer increased the vertical variation in the DOM characteristics of the paddy soil profiles. The consistency and correlation analysis of the DOM and Fe and Mn oxide contents in the profile indicated that Fe and Mn oxides might be the main influencing factors of DOM vertical heterogeneity, which was mediated by the weakening of mineral protection and the increase in the degree of mineral dissimilar reduction with increasing soil depth.
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来源期刊
Soil & Tillage Research
Soil & Tillage Research 农林科学-土壤科学
CiteScore
13.00
自引率
6.20%
发文量
266
审稿时长
5 months
期刊介绍: Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.
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