Effects of intercropping on composition and molecular diversity of soil dissolved organic matter in apple orchards: Different roles of bacteria and fungi

IF 6 1区 农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY
Rongqin Zhang , Zhuoliang Liu , Yuanji Wang , Zhengfeng Jiang , Ming Li , Huike Li , Xining Zhao , Zhilong Duan , Xiaolin Song
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引用次数: 0

Abstract

Dissolved organic matter (DOM) plays a crucial role in soil biogeochemical processes. However, the dynamic changes in DOM composition under intercropping systems of different ages, as well as the underlying mechanisms through which microbes influence DOM formation, remain unclear. In this study, we analysed soil samples collected at varying depths from intercropping systems with white clover of different ages to determine DOM dynamics and how DOM is regulated by bacteria and fungi. The results showed that the DOM content increased by 16 and 61 % at depths of 0–40 cm in 8-year and 16-year intercropping systems, respectively, compared with clean tillage (CT). The 8-year soil profiles showed an increase in the relative abundance of biologically refractory DOM compounds (tannin- and humic-like), leading to enhanced chemodiversity. In contrast, the DOM composition in the 16-year soil profiles was similar to that in the CT. Significant changes in the bacterial community were observed in the 8-year soil profiles, characterised by increased relative abundances of dominant Proteobacteria, Nitrospirae, Cytophagia, and Chitinophagia, along with enhanced bacterial alpha diversity. The correlation results indicated that bacterial taxa exhibited strong and interconnected positive correlations with the DOM diversity index, highlighting the bacterial role in the transformation of DOM compounds and the increase in DOM chemodiversity. Conversely, the fungi appeared to selectively degrade lignin to form biologically refractory compounds because they exhibited negative correlations with numerous lignin-like compounds and showed positive correlations with humic-like molecules. In conclusion, this study suggests that bacteria and fungi regulate DOM diversity and the formation of biologically refractory compounds via distinct pathways, providing important insights into the roles of microbes in mediating soil DOM formation and transformation.
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来源期刊
Agriculture, Ecosystems & Environment
Agriculture, Ecosystems & Environment 环境科学-环境科学
CiteScore
11.70
自引率
9.10%
发文量
392
审稿时长
26 days
期刊介绍: Agriculture, Ecosystems and Environment publishes scientific articles dealing with the interface between agroecosystems and the natural environment, specifically how agriculture influences the environment and how changes in that environment impact agroecosystems. Preference is given to papers from experimental and observational research at the field, system or landscape level, from studies that enhance our understanding of processes using data-based biophysical modelling, and papers that bridge scientific disciplines and integrate knowledge. All papers should be placed in an international or wide comparative context.
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