Different biochemical composition and oxidation state of soil organic matter between upland and paddy fields

文献类型： 外文期刊

第一作者： Feng, Miao

作者： Feng, Miao;Shang, Yuntao;Guo, Changcheng;Wang, Yidong;Feng, Miao;Wang, Yidong;Liu, Kailou;Lou, Yilai;Song, Zhaoliang;Gunina, Anna;Gunina, Anna

作者机构：

关键词： Analytical pyrolysis; Land use change; Lignin; Organo-mineral association; Py-GC/MS

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.6； 五年影响因子：3.8 ）

ISSN： 1439-0108

年卷期： 2024 年 24 卷 5 期

页码：

收录情况： SCI

摘要： Purpose The chemistry of soil organic matter (SOM) is fundamental for sustainable and climate-smart agroecosystems. However, the differences in SOM chemistry between the upland and paddy soils developing under the same climatic and edaphic conditions are unclear. Materials and methods Py-GC/MS was applied to characterize the biochemical features of SOM in three physical size fractions: coarse particulate (> 0.25 mm, cPOM), fine particulate (0.053-0.25 mm, fPOM), and mineral-associated OM (< 0.053 mm, MAOM) of upland and paddy fields under long-term (> 30 years) mineral and manure fertilizations. Results and discussion Paddy fields had higher contents of soil organic carbon (SOC) and total nitrogen (TN) mainly accumulated in MAOM fraction than uplands. These two soils had different molecular compositions of SOM: N-containing compounds including amino-N and heterocyclic-N compounds enriched in the uplands, whereas paddy had higher proportions of lipids and phenolics. The SOM composition was also dependent on particle size, especially in the uplands, where POM fractions had high contents of lignin and MAOM accumulated N-containing components. In contrast, POM in paddy accumulated polysaccharides, whereas MAOM was enriched with lipids. Particle size controlled the C oxidation state (C-ox), and paddy soils had higher C-ox than that of uplands, mainly in the MAOM fraction. Conclusions The molecular composition SOM was primarily regulated by land-use type, following by fraction size and fertilization regime, while the C-ox was controlled by fraction size. The C-ox needs more attention to understand the direction of formation of SOM fractions.

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