长期不同利用方式对黑土剖面中有机质化学组成的影响
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中国科学院东北地理与农业生态研究所

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国家自然科学基金(41807094),中国科学院战略性先导科技专项(A类)(XDA28070100)和财政部和农业农村部国家现代农业产业技术体系(CARS-04)


Impact of Long-term Land-Use Patterns on Chemical Composition of Soil Organic Matter in Mollisol Profile
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National Field Observation and Research Station of Hailun Agroecosystems,Key Laboratory of Mollisols Agroecology,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences

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National Natural Science Foundation of China (Nos. 41807094), Strategic Priority Research Program of the Chinese Academy of Sciences (Nos. XDA28070100) and China Agriculture Research System of MOF and MARA (Nos.CARS-04)

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    摘要:

    为了研究土地利用方式改变对土壤有机质(SOM)组成和稳定的影响。以典型黑土区29年长期定位试验为平台,采用红外光谱和固体13C核磁共振技术,对农田、草地和林地三种利用方式下不同剖面深度(0~10、10~20、20~40、40~60、60~80和80~100 cm)SOM的活性组分含量和有机质官能团进行了分析,探讨了土地利用方式变更对SOM化学组成的影响。结果表明:土壤剖面中4种活性有机碳(微生物生物量碳,溶解性有机碳,轻组有机碳和易氧化有机碳)的含量均表现为草地>林地>农田。随着剖面深度的增加,SOM的脂族碳、甲氧基碳和烷氧基碳逐渐降低,而芳香碳和羧基碳则逐渐增加,其稳定程度逐渐增强。草地和林地土壤剖面中的SOM含有较多氧化程度低、易分解的甲氧基和烷氧碳,而农田SOM则含有较高的芳香结构和羧基碳,其腐质化程度较高。土地利用方式的改变会引起上、下土层中SOM化学组成的变化,植被恢复有利于SOM活性组分的形成,长期耕作可促进SOM稳定组分的积累。

    Abstract:

    【Objective】The objective of this study was to assess the effect of land-use changes on the composition and stability of soil organic matter (SOM). 【Method】Based on a 29 years long-term experiment in typical Mollisol region, we investigated the contents of labile fractions of SOM in depths of 0~10、10~20、20~40、40~60、60~80 and 80~100 cm. Furthermore, Fourier transform infra-red and solid-state 13C nuclear magnetic resonance spectroscopies were applied to estimate the differences in functional C groups of SOM under different land uses. The land-use types included cultivated land (CL), restored grassland (GL) and artificial spruce forest land (FL). 【Result】The contents of soil labile organic C fractions (i.e. microbial biomass C, dissolved organic C, light fraction organic C and readily oxidizable organic C) were higher in GL and FL than in CL at all soil depths, and followed the order of GL> FL >CL. With the increase of soil depth, the aliphatic C, OCH3 and O-alkyl C groups of SOM gradually decreased, while the aromatic C and carboxyl C gradually increased. This indicated that the stability of SOM increased with soil depth. The proportion of OCH3 and O-alkyl C groups from plant residues were highest in the GL across all depth, followed by FL, and lowest in the CL. The SOM of CL had higher proportion of aromatic C and carboxyl C groups than that of GL and FL. This resulted a higher humification degree of SOM in CL. 【Conclusion】Our results suggest that land use changes modify the chemical composition of SOM both in the topsoil and subsoil. Vegetation restoration could increase labile components of SOM. In contrast, long-term cultivation prompted the accumulation of recalcitrant fractions in SOM.

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郝翔翔,邹文秀,韩晓增.长期不同利用方式对黑土剖面中有机质化学组成的影响[J].土壤学报,2022,59(5). DOI:10.11766/trxb202106010286 HAO Xiangxiang, ZOU Wenxiu, HAN Xiaozeng. Impact of Long-term Land-Use Patterns on Chemical Composition of Soil Organic Matter in Mollisol Profile[J]. Acta Pedologica Sinica,2022,59(5).

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