不同有机物料还田后砂质土壤有机碳组分结构特征

doi:10.3969/j.issn.1674-7968.2022.11.013

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Abstract In recent years, solid-state ¹³C nuclear magnetic resonance (NMR) technology has become an application hotspot in the research field of soil organic carbon molecular structure. Compared with loam and clay, sandy soil was more sensitive to the feedback mechanism of soil carbon fractions changes. To reveal the effects of soil organic carbon fractions and stability under different external organic carbon input, this study, with straw (ST) returning as the main control and chemical fertilizer (CF) treatment as the secondary control, the effects of the amendment of 3 organic materials for 8 consecutive years on the molecular structure of organic carbon in sandy soil were determined by ¹³C-NMR technology. Results showed that: 1) Soil organic carbon fractions were predominant as O-alkyl C (45~110 ppm) which was dominated by carbohydrate C (60~90 ppm) in pig manure (PM), biogas residue (BR) and biochar (BC) treatments, similar to that in the 2 control groups. 2) Compared with the ST treatment (main control), the recalcitrant organic carbon (alkyl C and aromatic C) decreased by 2.96% and 3.77% in BR and PM treatments respectively, but increased by 8.12% in BC treatment. Compared with the ST treatment, the Hydrophobicity index (HI) decreased by 4.93% and 6.25% in BR and PM treatments respectively, but increased by 14.65% in BC treatment. The aromaticity of BC treatment was about 1.7 to 2.0 times that of BR and PM treatments. 3) Redundancy analysis showed that the relative proportion of aromatic C significantly impacted the stability indexes and the content of soil organic carbon (P<0.01). Due to the differences in soil organic carbon fractions under the amendment of different organic materials, BR and PM treatments increased the relative proportion of labile organic carbon (carbohydrate C) and carboxylic C, which meant that the stability of soil organic carbon was weakened. BC treatment increased the relative proportion of recalcitrant organic carbon (aromatic C), the effect of improving the stability of soil organic carbon was more significant. The present study could provide insight for further improving the stability of farmland soil organic carbon pool.

Key words： Organic materials Long-term fertilization Solid-state ¹³C nuclear magnetic resonance (NMR) Organic carbon molecular structure

Received: 18 December 2021

ZTFLH:

S153.6

Corresponding Authors: * Corresponding authors, suipeng@cau.edu.cn; jliu207@cau.edu.cn

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	Articles by authors
	HAO Jin-Yu
	CHEN Yuan-Quan
	DAI Hong-Cui
	LI Chao
	XU Jie
	LIU Jin
	SUI Peng

Cite this article:

HAO Jin-Yu,CHEN Yuan-Quan,DAI Hong-Cui, et al. Characterization of Soil Organic Carbon Fractions Under Different Organic Materials Amendment in Sandy Soil[J]. 农业生物技术学报, 2022, 30(11): 2201-2211.

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http://journal05.magtech.org.cn/Jwk_ny/EN/10.3969/j.issn.1674-7968.2022.11.013 OR http://journal05.magtech.org.cn/Jwk_ny/EN/Y2022/V30/I11/2201

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