Positive effect of carbohydrate-metabolizing bacteria determines increasing soil organic carbon during long-term fertilization and straw returning in the black soil region of China

Yingxin LI ¹Yu SUN ²Eiko E.KURAMAE ³Shaoqing ZHANG ⁴Enze WANG ⁴Zongmu YAO ⁴Fahad NASIR ²Lei TIAN ²Qiang GAO ⁵Chunjie TIAN²

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作者信息

1. State Key Laboratory of Black Soils Conservation and Utilization,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102(China);University of Chinese Academy of Sciences,Beijing 100049(China);Department of Microbial Ecology,Netherlands Institute of Ecology(NIOO-KNAW),Wageningen 6708 PB(The Netherlands)
2. State Key Laboratory of Black Soils Conservation and Utilization,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102(China)
3. Department of Microbial Ecology,Netherlands Institute of Ecology(NIOO-KNAW),Wageningen 6708 PB(The Netherlands);Ecology and Biodiversity Group,Department of Biology,Institute of Environmental Biology,Utrecht University,Padualaan 8,Utrecht 3584 CH(The Netherlands)
4. State Key Laboratory of Black Soils Conservation and Utilization,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102(China);University of Chinese Academy of Sciences,Beijing 100049(China)
5. Jilin Agricultural University,Key Lab Soil Resource Sustainable Utilization for Jilin Province Commodity Grain Bases,Changchun 130118(China)
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Abstract

In the context of global efforts to reduce carbon(C)emissions,several studies have examined the effects of agricultural practices such as straw returning and fertilization on C sequestration by microorganisms.However,our understanding of the specific microbial groups and their roles in long-term C increase remains limited.In this study,a 36-year(1984-2020)farmland experiment was conducted to investigate the impact of bacterial C metabolism on the augmentation of organic C in a Typic Hapludoll(Mollisol)in the black soil region of Jilin Province,Northeast China.Our results demonstrated a noteworthy increase in the diversity of microorganisms in the farmland as a result of long-term straw returning and application of mixed chemical fertilizers.However,by examining the functions of microorganisms involved in C metabolism,it was observed that the effects of fertilization on C metabolism were relatively consistent.This consistency was attributed to a deterministic competitive exclusion process,which minimized the differences between treatment groups.On the other hand,the influence of straw addition on C metabolism appeared to follow a more random pattern.These changes in microbial activity were closely linked to the downregulation of core metabolic pathways related to C metabolism.Notably,long-term fertilization had a negative impact on soil organic C levels,while long-term straw returning plus fertilization resulted in a positive increase in soil organic C.These findings have important implications for enhancing soil organic C and grain yield in the regions with typical black soil.

Key words

community assembly/metabolic pathway/microbial activity/Mollisol/soil organic C/straw addition

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基金项目

Science and Technology Cooperation Project Between Jilin Province and Chinese Academy of Sciences(2022000170)

National Natural Science Foundation of China(41920104008)

National Natural Science Foundation of China(U22A20593)

Strategic Priority Research Program of CAS(XDA28020400)

出版年

2024

土壤圈(英文版)

中国土壤学会,中科院南京土壤研究所和土壤与农业可持续发展国家重点实验室

土壤圈(英文版)

CSTPCD

影响因子：0.477

ISSN：1002-0160

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