作物轮作模式对土壤活性有机碳、碳降解微生物及其在有机碳矿化中的作用的调控

IF 4.1 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2024-12-03 DOI:10.1007/s11104-024-07082-y

Xin Yang, Jun Zhu, Tao Ren, Jian Zhao, Yating Fang, Rihuan Cong, Zhifeng Lu, Xiaokun Li, Jianwei Lu

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引用次数: 0

摘要

作物轮作是可持续农业管理的重要实践。本研究旨在研究无CK轮作和化肥轮作下油菜-水稻（OR）、小麦-水稻（WR）、油菜-玉米（OM）和小麦-玉米（WM）土壤活性有机碳（SOC）矿化、碳降解微生物和土壤有机碳（SOC）矿化。方法在沙阳县进行了为期7年的不同轮作大田试验。利用荧光激发-发射矩阵（EEM）分析溶解有机碳（DOC）结构，利用宏基因组学研究糖苷水解酶（GH）和辅助活性（AA）家族。通过培养实验对有机碳矿化进行了研究。结果水旱轮作（OR， WR）土壤活性有机碳含量高于旱作（OM， WM），土壤DOC结构更简单。油菜轮作（OR， OM）土壤活性碳含量高于小麦轮作（WR， WM）。水旱轮作土壤GH家族基因丰度高于旱作轮作。施肥后，土壤GH家族基因丰度和β-葡萄糖苷酶活性均高于轮作后的轮作。油菜轮作土壤有机碳矿化高于小麦轮作，旱水田轮作土壤有机碳矿化高于不施肥轮作。施肥增加了有机碳矿化，但减小了轮作模式间的差异。结论油菜轮作土壤有机碳矿化程度高于小麦轮作，轮作主要通过调节土壤有机质含量、生长激素基因家族丰度和β-葡萄糖苷酶活性来影响土壤有机碳矿化。

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Regulation of crop rotation patterns on soil labile organic carbon, carbon-degrading microorganisms and their roles in organic carbon mineralization

Aims

Crop rotation is a vital practice in sustainable agricultural management. This study aimed to investigate soil labile organic carbon, carbon-degrading microorganisms, and soil organic carbon (SOC) mineralization in oilseed rape-rice (OR), wheat-rice (WR), oilseed rape-maize (OM), and wheat–maize (WM) rotations without (CK) and with the application of chemical fertilizers (NPK).

Methods

A 7-year field experiment involving different crop rotations was conducted in Shayang County, China. Fluorescence excitation—emission matrix (EEM) was used in analyzing dissolved organic carbon (DOC) structure, metagenomics was employed to investigate the specific glycoside hydrolase (GH) and auxiliary activity (AA) families. The mineralization of SOC was investigated through an incubation experiment.

Results

The paddy-upland (OR, WR) rotations showed higher soil labile organic carbon content and simpler DOC structure than their corresponding continuous upland (OM, WM) rotations. Oilseed rape contained (OR, OM) rotations showed higher soil labile carbon content than the corresponding wheat contained (WR, WM) rotations. The abundance of soil GH family genes was higher in paddy-upland rotations than those in continuous upland rotations. Furthermore, both the abundance of soil GH family genes and β-glucosidase activity were higher in OM rotation than in WM rotation after fertilization. The SOC mineralization was higher in oilseed rape contained rotations than in wheat contained rotations and higher in paddy-upland rotations than in continuous rotations without fertilization. Fertilization increased SOC mineralization, but reduced the difference among crop rotation patterns.

Conclusion

Oilseed rape contained rotations had higher SOC mineralization than wheat contained rotations, rotations affected SOC mineralization mainly by regulating DOC content, abundance of GH gene families and β-glucosidase activity.

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来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.