Assignment of Thermogravimetric Mass Losses to Soil Organic Matter, Its Fractions Hot Water–Extractable and Microbial Biomass Carbon, and Organic Matter–Stabilizing Soil Mineral Properties

IF 2.6 3区农林科学 Q1 AGRONOMY

Journal of Plant Nutrition and Soil Science Pub Date : 2025-02-13 DOI:10.1002/jpln.202400498

Malte Ortner, Michael Seidel, Dörte Diehl, Michael Vohland, Sören Thiele-Bruhn

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引用次数: 0

Abstract

Background

The stability of soil organic matter (SOM) can be characterized by thermal analysis. Methods to determine the thermal stability of SOM have recently been increasingly applied in soil analysis. Most studies focus on organic carbon (OC), whereas its subfractions, for example, microbial biomass carbon (MBC) or hot water–extractable carbon (HWEC), representing fast-reacting pools, have been less investigated.

Aim

A set of 100 soil samples was analyzed for thermal mass losses and their relation to SOM and soil mineral phase properties.

Method

The temperature-dependent mass losses were determined by thermogravimetric analysis. For this purpose, soils differing in terms of parent material, soil texture, and land use were characterized and analyzed.

Results

Temperature ranges of mass losses and corresponding fractions of different thermal stability (thermolabile and thermostable) were defined. SOM-related parameters were highly correlated with mass losses of the thermolabile fractions. Mass losses of thermostable matter were significantly correlated with soil mineral phase parameters. The soil thermostability index (STSI) was calculated as the ratio of thermolabile and thermostable mass proportions, represented by the mass losses of selected temperature intervals. Regressions of STSI with ratios of mineral phase parameters to OC (e.g., clay/OC), representing the saturation degree of the mineral phase with OC, HWEC, or MBC, yielded strong relationships.

Conclusion

The saturation of the mineral phase with OC determines the thermal stability of OC. Overall, relevant factors for OC thermal stability were identified. OC and HWEC were significantly correlated with thermal stability and mineral phase saturation. For MBC, no such relationship was found, indicating that its stability is driven by other factors.

Abstract Image

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土壤有机质、热水萃取物和微生物生物量碳的热重质量损失分配，以及有机质稳定土壤矿物性质

土壤有机质的稳定性可以通过热分析来表征。近年来，测定SOM热稳定性的方法越来越多地应用于土壤分析。大多数研究集中在有机碳（OC）上，而其亚组分，如代表快速反应池的微生物生物量碳（MBC）或热水可提取碳（HWEC）的研究较少。目的分析100份土壤样品的热质量损失及其与SOM和土壤矿物相性质的关系。方法采用热重分析方法测定其随温度变化的质量损失。为此，对不同母质、土壤质地和土地利用方式的土壤进行了表征和分析。结果确定了不同热稳定性（热不稳定性和热不稳定性）的质量损失温度范围和相应分数。som相关参数与热稳定性组分的质量损失高度相关。热稳性物质的质量损失与土壤矿质相参数呈显著相关。土壤热稳性指数（STSI）计算为热稳性质量比与热稳性质量比之比，由所选温度区间的质量损失表示。STSI与矿物相参数与OC（例如粘土/OC）的比值（代表矿物相与OC、HWEC或MBC的饱和度）的回归得到了很强的关系。结论矿物相与OC的饱和度决定OC的热稳定性。总体而言，确定了影响OC热稳定性的相关因素。OC和HWEC与热稳定性和矿相饱和度呈显著相关。对于MBC，没有发现这种关系，说明其稳定性是由其他因素驱动的。

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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.