The response of soil organic carbon sequestration to organic materials addition in saline-alkali soil: from the perspective of soil aggregate structure and organic carbon component

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2025-01-06 DOI:10.1007/s11104-024-07163-y

Liuyu Zhang, Mengmeng Chen, Yutong Zong, Zeqiang Sun, Yuyi Li, Xiaodong Ding, Shirong Zhang

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引用次数: 0

Abstract

Background and aims

Promoting soil organic carbon (SOC) sequestration is the key to improving soil quality. Adding organic materials is a common practice to promote SOC sequestration. However, the mechanism of SOC sequestration in saline-alkali soil with different organic materials addition is still unclear.

Methods

Field experiment was conducted: (1) Control, no fertilization; (2) NPK, only mineral fertilizer addition; (3) OF, NPK plus 2000 kg C ha^-1 addition of organic fertilizer; (4) MS, NPK plus 2000 kg C ha^-1 addition of maize straw.

Results

Compared with NPK treatment, the mean weight diameter (MWD) in OF and MS treatments was increased by 23.08% and 11.54%, respectively, which was due to the reduction of exchangeable sodium saturation percentage. Exchangeable calcium and magnesium were positively correlated with MWD, and their contents in OF treatment were 6.89-32.05% higher than those in MS treatment. Meanwhile, MWD was positively correlated with SOC stock, and small macro-aggregates contributed the most to SOC. Compared with NPK treatment, the ratio of mineral-associated organic carbon to particular organic carbon in MS and OF treatments were increased by 34.06% and 80.88%, respectively. Exchangeable magnesium and calcium could bind with polysaccharide, carboxyl and phenol to form complex under organic materials addition. Hence, SOC stock in OF and MS treatments was increased by 14.18% and 6.38% compared to NPK treatment, respectively.

Conclusion

The addition of organic materials improved the stability of aggregate structure and SOC pool in saline-alkali soil, thereby promoting SOC sequestration, in which organic fertilizer showed better effect.

Graphical Abstract

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盐碱地土壤有机碳固存对有机质添加的响应——基于土壤团聚体结构和有机碳组分的研究

背景与目的促进土壤有机碳（SOC）的固存是改善土壤质量的关键。添加有机材料是促进有机碳固存的常用方法。然而，不同有机质添加量对盐碱土固碳机制的影响尚不清楚。方法田间试验：(1)对照，不施肥；(2) NPK，只添加矿物肥；(3) OF、NPK +添加有机肥料2000 kg C ha-1；(4)玉米秸秆添加MS、NPK + 2000 kg cha -1。结果与NPK处理相比，OF和MS处理的平均重径（MWD）分别提高了23.08%和11.54%，这是由于降低了交换钠饱和率。交换性钙、镁与随钻率呈正相关，OF处理的交换性钙、镁含量比MS处理高6.89 ~ 32.05%。同时，随钻距离与土壤有机碳储量呈正相关，且小的宏观聚集体对土壤有机碳贡献最大。与NPK处理相比，MS和of处理的矿物伴生有机碳与特定有机碳之比分别提高了34.06%和80.88%。在有机物质的作用下，交换性镁和钙可以与多糖、羧基和苯酚结合形成络合物。与NPK处理相比，有机肥处理和MS处理的土壤有机碳储量分别增加了14.18%和6.38%。结论有机物质的添加提高了盐碱土团聚体结构的稳定性和有机碳库，从而促进了有机碳的固存，其中有机肥的效果更好。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.