Synergistic relationships between the age of soil organic matter, Fe speciation, and aggregate stability in an arable Luvisol

IF 2.6 3区农林科学 Q1 AGRONOMY

Journal of Plant Nutrition and Soil Science Pub Date : 2023-09-13 DOI:10.1002/jpln.202300020

Nina Siebers, Eva Voggenreiter, Prachi Joshi, Janet Rethemeyer, Liming Wang

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引用次数: 0

Abstract

Background

Knowledge of soil aggregate formation and stability is essential, as this is important for maintaining soil functions.

Aims

This study aimed to investigate the influence of organic matter (OM), the content of pedogenic iron (Fe) (oxyhydr)oxides, and aggregate size on the stability of aggregates in arable soil.

Methods

To this end, the Ap and Bt horizons of a Luvisol were sampled after 14 years of bare fallow, and the results were compared with a control field that had been permanently cropped.

Results

In the Ap horizon, bare fallow decreased the median diameter of the 53–250 µm size fraction by 26%. Simultaneously, the mass of the 20–53 µm size fraction increased by 65%, indicating reduced stability—particularly of larger soil microaggregates—due to the lack of input of fresh OM. The range of ¹⁴carbon (¹⁴C) fraction of modern C (F¹⁴C) under bare fallow was between 0.50 and 0.90, and thus lower than the cropped site (F¹⁴C between 0.75 and 1.01), which is particularly pronounced in the smallest size fraction, indicating the presence of older C. This higher stability and the reduced C turnover in <20 µm aggregates is probably also due to having the highest content of poorly crystalline Fe (oxy)hydroxides, compared to the other size fractions, which act as a cementing agent. Colloid transport from the Ap to the Bt horizon was observed under bare fallow treatment.

Conclusions

The lack of input of OM decreased the stability of microaggregates and led to a release of mobile colloids, the transport of which can initiate elemental fluxes with as-yet unknown environmental consequences.

Abstract Image

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可耕地卢维索尔中土壤有机物质年龄、铁标本和团聚稳定性之间的协同关系

背景了解土壤团聚体的形成和稳定性至关重要，因为这对维持土壤功能非常重要。目的本研究旨在探讨有机质（OM）、生铁（Fe）（氧氢）氧化物含量和团聚体大小对耕地土壤中团聚体稳定性的影响。为此，我们对裸露休耕 14 年后的 Luvisol 的 Ap 和 Bt 层进行了取样，并将结果与长期耕作的对照田进行了比较。结果在 Ap 层，裸露休耕使 53-250 µm 粒径部分的中值直径减少了 26%。同时，20-53 µm 粒径部分的质量增加了 65%，这表明由于缺乏新鲜 OM 的输入，稳定性降低了，尤其是较大的土壤微团聚体。裸露休耕条件下，现代碳的 14C 含量（F14C）范围在 0.50 到 0.90 之间，因此低于种植地（F14C 含量在 0.75 到 1.01 之间），这在最小粒径部分尤为明显，表明存在较老的碳。与其他粒径部分相比，20 微米聚集体中结晶度较低的铁（氧）氢氧化物含量最高，起到了胶结剂的作用，因此稳定性更高，碳周转率降低。在裸露休耕条件下，观察到胶体从 Ap 层迁移到 Bt 层。结论缺乏 OM 的输入会降低微团聚体的稳定性，并导致移动胶体的释放，这些胶体的迁移会引发元素流动，对环境造成尚不可知的后果。

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

Journal of Plant Nutrition and Soil Science 农林科学-农艺学

CiteScore

4.70

自引率

8.00%

发文量

审稿时长

8-16 weeks

期刊介绍： Established in 1922, the Journal of Plant Nutrition and Soil Science (JPNSS) is an international peer-reviewed journal devoted to cover the entire spectrum of plant nutrition and soil science from different scale units, e.g. agroecosystem to natural systems. With its wide scope and focus on soil-plant interactions, JPNSS is one of the leading journals on this topic. Articles in JPNSS include reviews, high-standard original papers, and short communications and represent challenging research of international significance. The Journal of Plant Nutrition and Soil Science is one of the world’s oldest journals. You can trust in a peer-reviewed journal that has been established in the plant and soil science community for almost 100 years. Journal of Plant Nutrition and Soil Science (ISSN 1436-8730) is published in six volumes per year, by the German Societies of Plant Nutrition (DGP) and Soil Science (DBG). Furthermore, the Journal of Plant Nutrition and Soil Science (JPNSS) is a Cooperating Journal of the International Union of Soil Science (IUSS). The journal is produced by Wiley-VCH. Topical Divisions of the Journal of Plant Nutrition and Soil Science that are receiving increasing attention are: JPNSS – Topical Divisions Special timely focus in interdisciplinarity: - sustainability & critical zone science. Soil-Plant Interactions: - rhizosphere science & soil ecology - pollutant cycling & plant-soil protection - land use & climate change. Soil Science: - soil chemistry & soil physics - soil biology & biogeochemistry - soil genesis & mineralogy. Plant Nutrition: - plant nutritional physiology - nutrient dynamics & soil fertility - ecophysiological aspects of plant nutrition.