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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摘要近年来固态¹³C核磁共振(nuclear magnetic resonance, NMR)技术已成为土壤有机碳分子结构研究领域的应用热点,相比于壤土和黏土,砂质土对土壤碳组分变化的反馈机制更加敏感。为揭示不同外源碳输入对土壤有机碳组分及稳定性的影响,本研究利用¹³C-NMR技术,以秸秆还田、单施化肥为主、副对照,测定3种有机物料进行8年连续还田后对砂质土壤有机碳分子结构的影响。结果表明：1)猪粪、沼渣和生物炭处理的土壤有机碳组分与对照组相似,均以烷氧碳(45~110 ppm)为主,其中碳水化合物类碳(60~90 ppm)是其构成的主体。2)与秸秆还田(主对照)相比,沼渣与猪粪还田后土壤耐分解碳组分(烷基碳+芳香碳)比例分别降低了2.96%和3.77%,而生物炭处理则增加了8.12%;沼渣与猪粪处理的疏水性指数分别比秸秆处理降低了4.93%和6.25%,而生物炭处理则提高了14.65%;生物炭处理的芳香度约为沼渣和猪粪处理的1.7~2.0倍。3)冗余分析表明,土壤芳香碳的相对含量对土壤有机碳稳定性指标和有机碳含量的影响达到显著水平(P<0.01)。由于不同有机物料还田后土壤有机碳组分存在差异,沼渣和猪粪还田后增加了土壤易分解碳组分(以碳水化合物类碳为主)和羧基碳,意味着土壤有机碳的稳定性被削弱了;生物炭还田后增加了土壤耐分解碳组分(以芳香碳为主),提升土壤有机碳稳定性的效果更显著。本研究结果可为进一步提升农田土壤有机碳库稳定性提供参考。

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	郝近羽
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	代红翠
	李超
	徐洁
	刘瑾
	隋鹏

关键词 ：有机物料, 长期施肥, 固态¹³C核磁共振(NMR), 有机碳分子结构

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

收稿日期: 2021-12-18

ZTFLH:

S153.6

基金资助:国家重点研发计划重点专项(2016YFD0300203)

通讯作者: * suipeng@cau.edu.cn;jliu207@cau.edu.cn

引用本文:

郝近羽, 陈源泉, 代红翠, 李超, 徐洁, 刘瑾, 隋鹏. 不同有机物料还田后砂质土壤有机碳组分结构特征[J]. 农业生物技术学报, 2022, 30(11): 2201-2211.
HAO Jin-Yu, CHEN Yuan-Quan, DAI Hong-Cui, LI Chao, XU Jie, LIU Jin, SUI Peng. Characterization of Soil Organic Carbon Fractions Under Different Organic Materials Amendment in Sandy Soil. 农业生物技术学报, 2022, 30(11): 2201-2211.

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

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